Bumping version to beta2

Can now properly handle .a[] expressions
added another test
2025-01-18 04:53:17 -08:00 · 2020-12-09 12:16:16 +11:00 · 2020-12-09 12:15:14 +11:00 · 2020-12-01 18:10:10 +11:00 · 2020-12-01 18:08:41 +11:00 · 2020-12-01 17:58:07 +11:00
121 changed files with 2525 additions and 1650 deletions
--- a/2
+++ b/2
@@ -22,4 +22,4 @@ LABEL version=${VERSION}

 WORKDIR /workdir

-ENTRYPOINT [/usr/bin/yq]
+ENTRYPOINT ["/usr/bin/yq"]
--- a/README.md
+++ b/README.md
@@ -25,16 +25,16 @@ snap install yq
 `yq` installs with [_strict confinement_](https://docs.snapcraft.io/snap-confinement/6233) in snap, this means it doesn't have direct access to root files. To read root files you can:

 ```
-sudo cat /etc/myfile | yq r - a.path
+sudo cat /etc/myfile | yq e '.a.path' - 
 ```

 And to write to a root file you can either use [sponge](https://linux.die.net/man/1/sponge):
 ```
-sudo cat /etc/myfile | yq w - a.path value | sudo sponge /etc/myfile
+sudo cat /etc/myfile | yq e '.a.path = "value"' - | sudo sponge /etc/myfile
 ```
 or write to a temporary file:
 ```
-sudo cat /etc/myfile | yq w - a.path value | sudo tee /etc/myfile.tmp
+sudo cat /etc/myfile | yq e '.a.path = "value"' | sudo tee /etc/myfile.tmp
 sudo mv /etc/myfile.tmp /etc/myfile
 rm /etc/myfile.tmp
 ```
@@ -48,7 +48,7 @@ wget https://github.com/mikefarah/yq/releases/download/{VERSION}/{BINARY} -O /us
    chmod +x /usr/bin/yq
 ```

-For instance, VERSION=3.4.0 and BINARY=yq_linux_amd64
+For instance, VERSION=4.0.0 and BINARY=yq_linux_amd64


 ### Run with Docker
@@ -56,7 +56,7 @@ For instance, VERSION=3.4.0 and BINARY=yq_linux_amd64
 #### Oneshot use:

 ```bash
-docker run --rm -v "${PWD}":/workdir mikefarah/yq yq [flags] <command> FILE...
+docker run --rm -v "${PWD}":/workdir mikefarah/yq <command> [flags] [expression ]FILE...
 ```

 #### Run commands interactively:
@@ -69,13 +69,13 @@ It can be useful to have a bash function to avoid typing the whole docker comman

 ```bash
 yq() {
-  docker run --rm -i -v "${PWD}":/workdir mikefarah/yq yq "$@"
+  docker run --rm -i -v "${PWD}":/workdir mikefarah/yq "$@"
 }
 ```

 ### Go Get:
 ```
-GO111MODULE=on go get github.com/mikefarah/yq/v3
+GO111MODULE=on go get github.com/mikefarah/yq/v4
 ```

 ## Community Supported Installation methods
@@ -108,9 +108,8 @@ Supported by @rmescandon (https://launchpad.net/~rmescandon/+archive/ubuntu/yq)

 ## Features
 - Written in portable go, so you can download a lovely dependency free binary
- [Colorize the output](https://mikefarah.gitbook.io/yq/usage/output-format#colorize-output)
- [Deep read a yaml file with a given path expression](https://mikefarah.gitbook.io/yq/commands/read#basic)
- [List matching paths of a given path expression](https://mikefarah.gitbook.io/yq/commands/read#path-only)
+- Colorized yaml output
+- [Deep read a yaml file with a given path expression](https://mikefarah.gitbook.io/yq/v/v4.x/traverse)
 - [Return the lengths of arrays/object/scalars](https://mikefarah.gitbook.io/yq/commands/read#printing-length-of-the-results)
 - Update a yaml file given a [path expression](https://mikefarah.gitbook.io/yq/commands/write-update#basic) or [script file](https://mikefarah.gitbook.io/yq/commands/write-update#basic)
 - Update creates any missing entries in the path on the fly
--- a/cmd/constant.go
+++ b/cmd/constant.go
@@ -2,10 +2,10 @@ package cmd

 var unwrapScalar = true

-// var writeInplace = false
+var writeInplace = false
 var outputToJSON = false

-// var exitStatus = false
+var exitStatus = false
 var forceColor = false
 var forceNoColor = false
 var colorsEnabled = false
@@ -15,4 +15,4 @@ var nullInput = false
 var verbose = false
 var version = false

-// var log = logging.MustGetLogger("yq")
+var completedSuccessfully = false
--- a/cmd/evaluate_all_command.go
+++ b/cmd/evaluate_all_command.go
@@ -1,6 +1,8 @@
 package cmd

 import (
+	"errors"
+	"fmt"
 	"os"

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
@@ -13,9 +15,8 @@ func createEvaluateAllCommand() *cobra.Command {
 		Aliases: []string{"ea"},
 		Short:   "Loads _all_ yaml documents of _all_ yaml files and runs expression once",
 		Example: `
-yq es '.a.b | length' file1.yml file2.yml
-yq es < sample.yaml
-yq es -n '{"a": "b"}'
+# merges f2.yml into f1.yml (inplace)
+yq eval-all --inplace 'select(fileIndex == 0) * select(fileIndex == 1)' f1.yml f2.yml		
 `,
 		Long: "Evaluate All:\nUseful when you need to run an expression across several yaml documents or files. Consumes more memory than eval",
 		RunE: evaluateAll,
@@ -23,6 +24,7 @@ yq es -n '{"a": "b"}'
 	return cmdEvalAll
 }
 func evaluateAll(cmd *cobra.Command, args []string) error {
+	cmd.SilenceUsage = true
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
@@ -39,26 +41,50 @@ func evaluateAll(cmd *cobra.Command, args []string) error {
 	if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
 		colorsEnabled = true
 	}
+
+	if writeInplace && len(args) < 2 {
+		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
+	}
+
+	if writeInplace {
+		// only use colors if its forced
+		colorsEnabled = forceColor
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
+		out, err = writeInPlaceHandler.CreateTempFile()
+		if err != nil {
+			return err
+		}
+		// need to indirectly call the function so  that completedSuccessfully is
+		// passed when we finish execution as opposed to now
+		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+	}
+
 	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)

+	allAtOnceEvaluator := yqlib.NewAllAtOnceEvaluator()
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
-			err = yqlib.EvaluateAllFileStreams("", []string{"-"}, printer)
+			err = allAtOnceEvaluator.EvaluateFiles("", []string{"-"}, printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	case 1:
 		if nullInput {
-			err = yqlib.EvaluateAllFileStreams(args[0], []string{}, printer)
+			err = yqlib.NewStreamEvaluator().EvaluateNew(args[0], printer)
 		} else {
-			err = yqlib.EvaluateAllFileStreams("", []string{args[0]}, printer)
+			err = allAtOnceEvaluator.EvaluateFiles("", []string{args[0]}, printer)
 		}
 	default:
-		err = yqlib.EvaluateAllFileStreams(args[0], args[1:], printer)
+		err = allAtOnceEvaluator.EvaluateFiles(args[0], args[1:], printer)
+	}
+
+	completedSuccessfully = err == nil
+
+	if err == nil && exitStatus && !printer.PrintedAnything() {
+		return errors.New("no matches found")
 	}

-	cmd.SilenceUsage = true
 	return err
 }
--- a/cmd/evalute_sequence_command.go
+++ b/cmd/evalute_sequence_command.go
@@ -1,6 +1,8 @@
 package cmd

 import (
+	"errors"
+	"fmt"
 	"os"

 	"github.com/mikefarah/yq/v4/pkg/yqlib"
@@ -13,9 +15,18 @@ func createEvaluateSequenceCommand() *cobra.Command {
 		Aliases: []string{"e"},
 		Short:   "Apply expression to each document in each yaml file given in sequence",
 		Example: `
-yq es '.a.b | length' file1.yml file2.yml
-yq es < sample.yaml
-yq es -n '{"a": "b"}'
+# runs the expression against each file, in series
+yq e '.a.b | length' f1.yml f2.yml 
+
+# prints out the file
+yq e sample.yaml 
+
+# prints a new yaml document
+yq e -n '.a.b.c = "cat"' 
+
+
+# updates file.yaml directly
+yq e '.a.b = "cool"' -i file.yaml 
 `,
 		Long: "Evaluate Sequence:\nIterate over each yaml document, apply the expression and print the results, in sequence.",
 		RunE: evaluateSequence,
@@ -23,6 +34,7 @@ yq es -n '{"a": "b"}'
 	return cmdEvalSequence
 }
 func evaluateSequence(cmd *cobra.Command, args []string) error {
+	cmd.SilenceUsage = true
 	// 0 args, read std in
 	// 1 arg, null input, process expression
 	// 1 arg, read file in sequence
@@ -39,26 +51,50 @@ func evaluateSequence(cmd *cobra.Command, args []string) error {
 	if forceColor || (!forceNoColor && (fileInfo.Mode()&os.ModeCharDevice) != 0) {
 		colorsEnabled = true
 	}
+
+	if writeInplace && len(args) < 2 {
+		return fmt.Errorf("Write inplace flag only applicable when giving an expression and at least one file")
+	}
+
+	if writeInplace {
+		// only use colors if its forced
+		colorsEnabled = forceColor
+		writeInPlaceHandler := yqlib.NewWriteInPlaceHandler(args[1])
+		out, err = writeInPlaceHandler.CreateTempFile()
+		if err != nil {
+			return err
+		}
+		// need to indirectly call the function so  that completedSuccessfully is
+		// passed when we finish execution as opposed to now
+		defer func() { writeInPlaceHandler.FinishWriteInPlace(completedSuccessfully) }()
+	}
+
 	printer := yqlib.NewPrinter(out, outputToJSON, unwrapScalar, colorsEnabled, indent, !noDocSeparators)

+	streamEvaluator := yqlib.NewStreamEvaluator()
+
 	switch len(args) {
 	case 0:
 		if pipingStdIn {
-			err = yqlib.EvaluateFileStreamsSequence("", []string{"-"}, printer)
+			err = streamEvaluator.EvaluateFiles("", []string{"-"}, printer)
 		} else {
 			cmd.Println(cmd.UsageString())
 			return nil
 		}
 	case 1:
 		if nullInput {
-			err = yqlib.EvaluateAllFileStreams(args[0], []string{}, printer)
+			err = streamEvaluator.EvaluateNew(args[0], printer)
 		} else {
-			err = yqlib.EvaluateFileStreamsSequence("", []string{args[0]}, printer)
+			err = streamEvaluator.EvaluateFiles("", []string{args[0]}, printer)
 		}
 	default:
-		err = yqlib.EvaluateFileStreamsSequence(args[0], args[1:], printer)
+		err = streamEvaluator.EvaluateFiles(args[0], args[1:], printer)
+	}
+	completedSuccessfully = err == nil
+
+	if err == nil && exitStatus && !printer.PrintedAnything() {
+		return errors.New("no matches found")
 	}

-	cmd.SilenceUsage = true
 	return err
 }
--- a/cmd/root.go
+++ b/cmd/root.go
@@ -46,6 +46,8 @@ func New() *cobra.Command {

 	rootCmd.PersistentFlags().IntVarP(&indent, "indent", "I", 2, "sets indent level for output")
 	rootCmd.Flags().BoolVarP(&version, "version", "V", false, "Print version information and quit")
+	rootCmd.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace of first yaml file given.")
+	rootCmd.PersistentFlags().BoolVarP(&exitStatus, "exit-status", "e", false, "set exit status if there are no matches or null or false is returned")

 	rootCmd.PersistentFlags().BoolVarP(&forceColor, "colors", "C", false, "force print with colors")
 	rootCmd.PersistentFlags().BoolVarP(&forceNoColor, "no-colors", "M", false, "force print with no colors")
--- a/cmd/version.go
+++ b/cmd/version.go
@@ -11,7 +11,7 @@ var (
 	GitDescribe string

 	// Version is main version number that is being run at the moment.
-	Version = "4.0.0-alpha1"
+	Version = "4.0.0-beta2"

 	// VersionPrerelease is a pre-release marker for the version. If this is "" (empty string)
 	// then it means that it is a final release. Otherwise, this is a pre-release
--- a/cmd/write.go
+++ b/cmd/write.go
@@ -1,61 +0,0 @@
-package cmd
-
-// import (
-// 	"github.com/spf13/cobra"
-// )
-
-// func createWriteCmd() *cobra.Command {
-// 	var cmdWrite = &cobra.Command{
-// 		Use:     "write [yaml_file] [path_expression] [value]",
-// 		Aliases: []string{"w"},
-// 		Short:   "yq w [--inplace/-i] [--script/-s script_file] [--doc/-d index] sample.yaml 'b.e(name==fr*).value' newValue",
-// 		Example: `
-// yq write things.yaml 'a.b.c' true
-// yq write things.yaml 'a.*.c' true
-// yq write things.yaml 'a.**' true
-// yq write things.yaml 'a.(child.subchild==co*).c' true
-// yq write things.yaml 'a.b.c' --tag '!!str' true # force 'true' to be interpreted as a string instead of bool
-// yq write things.yaml 'a.b.c' --tag '!!float' 3
-// yq write --inplace -- things.yaml 'a.b.c' '--cat' # need to use '--' to stop processing arguments as flags
-// yq w -i things.yaml 'a.b.c' cat
-// yq w -i -s update_script.yaml things.yaml
-// yq w things.yaml 'a.b.d[+]' foo # appends a new node to the 'd' array
-// yq w --doc 2 things.yaml 'a.b.d[+]' foo # updates the 3rd document of the yaml file
-//       `,
-// 		Long: `Updates the yaml file w.r.t the given path and value.
-// Outputs to STDOUT unless the inplace flag is used, in which case the file is updated instead.
-
-// Append value to array adds the value to the end of array.
-
-// Update Scripts:
-// Note that you can give an update script to perform more sophisticated update. Update script
-// format is list of update commands (update or delete) like so:
-// ---
-// - command: update
-//   path: b.c
-//   value:
-//     #great
-//     things: frog # wow!
-// - command: delete
-//   path: b.d
-// `,
-// 		RunE: writeProperty,
-// 	}
-// 	cmdWrite.PersistentFlags().BoolVarP(&writeInplace, "inplace", "i", false, "update the yaml file inplace")
-// 	cmdWrite.PersistentFlags().StringVarP(&writeScript, "script", "s", "", "yaml script for updating yaml")
-// 	cmdWrite.PersistentFlags().StringVarP(&sourceYamlFile, "from", "f", "", "yaml file for updating yaml (as-is)")
-// 	cmdWrite.PersistentFlags().StringVarP(&customTag, "tag", "t", "", "set yaml tag (e.g. !!int)")
-// 	cmdWrite.PersistentFlags().StringVarP(&docIndex, "doc", "d", "0", "process document index number (0 based, * for all documents)")
-// 	cmdWrite.PersistentFlags().StringVarP(&customStyle, "style", "", "", "formatting style of the value: single, double, folded, flow, literal, tagged")
-// 	cmdWrite.PersistentFlags().StringVarP(&anchorName, "anchorName", "", "", "anchor name")
-// 	cmdWrite.PersistentFlags().BoolVarP(&makeAlias, "makeAlias", "", false, "create an alias using the value as the anchor name")
-// 	return cmdWrite
-// }
-
-// func writeProperty(cmd *cobra.Command, args []string) error {
-// 	var updateCommands, updateCommandsError = readUpdateCommands(args, 3, "Must provide <filename> <path_to_update> <value>", true)
-// 	if updateCommandsError != nil {
-// 		return updateCommandsError
-// 	}
-// 	return updateDoc(args[0], updateCommands, cmd.OutOrStdout())
-// }
--- a/cmd/write_test.go
+++ b/cmd/write_test.go
@@ -1,610 +0,0 @@
-package cmd
-
-// import (
-// 	"fmt"
-// 	"runtime"
-// 	"strings"
-// 	"testing"
-
-// 	"github.com/mikefarah/yq/v3/test"
-// )
-
-// func TestWriteCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteKeepCommentsCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3 # comment
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 7 # comment
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithTaggedStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --tag=!!str --style=tagged", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: !!str cat
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithDoubleQuotedStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --style=double", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: "cat"
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteUpdateStyleOnlyCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-//   d: things
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.* --style=single", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 'dog'
-//   d: 'things'
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteUpdateTagOnlyCmd(t *testing.T) {
-// 	content := `b:
-//   c: true
-//   d: false
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.* --tag=!!str", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: "true"
-//   d: "false"
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithSingleQuotedStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --style=single", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 'cat'
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithLiteralStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --style=literal", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: |-
-//     cat
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteWithFoldedStyleCmd(t *testing.T) {
-// 	content := `b:
-//   c: dog
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c cat --style=folded", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: >-
-//     cat
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteEmptyMultiDocCmd(t *testing.T) {
-// 	content := `# this is empty
-// ---
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `c: 7
-
-// # this is empty
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteSurroundingEmptyMultiDocCmd(t *testing.T) {
-// 	content := `---
-// # empty
-// ---
-// cat: frog
-// ---
-
-// # empty
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -d1 c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `
-
-// # empty
-// ---
-// cat: frog
-// c: 7
-// ---
-
-// # empty
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteFromFileCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	source := `kittens: are cute # sure are!`
-// 	fromFilename := test.WriteTempYamlFile(source)
-// 	defer test.RemoveTempYamlFile(fromFilename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c -f %s", filename, fromFilename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c:
-//     kittens: are cute # sure are!
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteEmptyCmd(t *testing.T) {
-// 	content := ``
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteAutoCreateCmd(t *testing.T) {
-// 	content := `applications:
-//   - name: app
-//     env:`
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s applications[0].env.hello world", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `applications:
-//   - name: app
-//     env:
-//       hello: world
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmdScript(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	updateScript := `- command: update
-//   path: b.c
-//   value: 7`
-// 	scriptFilename := test.WriteTempYamlFile(updateScript)
-// 	defer test.RemoveTempYamlFile(scriptFilename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write --script %s %s", scriptFilename, filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmdEmptyScript(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	updateScript := ``
-// 	scriptFilename := test.WriteTempYamlFile(updateScript)
-// 	defer test.RemoveTempYamlFile(scriptFilename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write --script %s %s", scriptFilename, filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 3
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteMultiCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// ---
-// apples: great
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -d 1 apples ok", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 3
-// ---
-// apples: ok
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-// func TestWriteInvalidDocumentIndexCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -df apples ok", filename))
-// 	if result.Error == nil {
-// 		t.Error("Expected command to fail due to invalid path")
-// 	}
-// 	expectedOutput := `Document index f is not a integer or *: strconv.ParseInt: parsing "f": invalid syntax`
-// 	test.AssertResult(t, expectedOutput, result.Error.Error())
-// }
-
-// func TestWriteBadDocumentIndexCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -d 1 apples ok", filename))
-// 	if result.Error == nil {
-// 		t.Error("Expected command to fail due to invalid path")
-// 	}
-// 	expectedOutput := `asked to process document index 1 but there are only 1 document(s)`
-// 	test.AssertResult(t, expectedOutput, result.Error.Error())
-// }
-// func TestWriteMultiAllCmd(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// ---
-// apples: great
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -d * apples ok", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: 3
-// apples: ok
-// ---
-// apples: ok`
-// 	test.AssertResult(t, expectedOutput, strings.Trim(result.Output, "\n "))
-// }
-
-// func TestWriteCmd_EmptyArray(t *testing.T) {
-// 	content := `b: 3`
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s a []", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b: 3
-// a: []
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_Error(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "write")
-// 	if result.Error == nil {
-// 		t.Error("Expected command to fail due to missing arg")
-// 	}
-// 	expectedOutput := `Must provide <filename> <path_to_update> <value>`
-// 	test.AssertResult(t, expectedOutput, result.Error.Error())
-// }
-
-// func TestWriteCmd_ErrorUnreadableFile(t *testing.T) {
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, "write fake-unknown a.b 3")
-// 	if result.Error == nil {
-// 		t.Error("Expected command to fail due to unknown file")
-// 	}
-// 	var expectedOutput string
-// 	if runtime.GOOS == "windows" {
-// 		expectedOutput = `open fake-unknown: The system cannot find the file specified.`
-// 	} else {
-// 		expectedOutput = `open fake-unknown: no such file or directory`
-// 	}
-// 	test.AssertResult(t, expectedOutput, result.Error.Error())
-// }
-
-// func TestWriteCmd_Inplace(t *testing.T) {
-// 	content := `b:
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write -i %s b.c 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	gotOutput := test.ReadTempYamlFile(filename)
-// 	expectedOutput := `b:
-//   c: 7`
-// 	test.AssertResult(t, expectedOutput, strings.Trim(gotOutput, "\n "))
-// }
-
-// func TestWriteCmd_InplaceError(t *testing.T) {
-// 	content := `b: cat
-//   c: 3
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write -i %s b.c 7", filename))
-// 	if result.Error == nil {
-// 		t.Error("Expected Error to occur!")
-// 	}
-// 	gotOutput := test.ReadTempYamlFile(filename)
-// 	test.AssertResult(t, content, gotOutput)
-// }
-
-// func TestWriteCmd_Append(t *testing.T) {
-// 	content := `b:
-//   - foo
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b[+] 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   - foo
-//   - 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_AppendInline(t *testing.T) {
-// 	content := `b: [foo]`
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b[+] 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b: [foo, 7]
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_AppendInlinePretty(t *testing.T) {
-// 	content := `b: [foo]`
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s -P b[+] 7", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   - foo
-//   - 7
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_AppendEmptyArray(t *testing.T) {
-// 	content := `a: 2
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b[+] v", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `a: 2
-// b:
-//   - v
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_SplatArray(t *testing.T) {
-// 	content := `b:
-// - c: thing
-// - c: another thing
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b[*].c new", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   - c: new
-//   - c: new
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_SplatMap(t *testing.T) {
-// 	content := `b:
-//   c: thing
-//   d: another thing
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.* new", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: new
-//   d: new
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
-
-// func TestWriteCmd_SplatMapEmpty(t *testing.T) {
-// 	content := `b:
-//   c: thing
-//   d: another thing
-// `
-// 	filename := test.WriteTempYamlFile(content)
-// 	defer test.RemoveTempYamlFile(filename)
-
-// 	cmd := getRootCommand()
-// 	result := test.RunCmd(cmd, fmt.Sprintf("write %s b.c.* new", filename))
-// 	if result.Error != nil {
-// 		t.Error(result.Error)
-// 	}
-// 	expectedOutput := `b:
-//   c: {}
-//   d: another thing
-// `
-// 	test.AssertResult(t, expectedOutput, result.Output)
-// }
--- a/go.mod
+++ b/go.mod
@@ -6,8 +6,7 @@ require (
 	github.com/goccy/go-yaml v1.8.1
 	github.com/jinzhu/copier v0.0.0-20190924061706-b57f9002281a
 	github.com/mattn/go-colorable v0.1.7 // indirect
-	github.com/spf13/cobra v1.0.0
-	github.com/spf13/pflag v1.0.5 // indirect
+	github.com/spf13/cobra v1.1.1
 	github.com/timtadh/data-structures v0.5.3 // indirect
 	github.com/timtadh/lexmachine v0.2.2
 	golang.org/x/sys v0.0.0-20200930185726-fdedc70b468f // indirect
--- a/go.sum
+++ b/go.sum
@@ -1,16 +1,33 @@
 cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.34.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
+cloud.google.com/go v0.38.0/go.mod h1:990N+gfupTy94rShfmMCWGDn0LpTmnzTp2qbd1dvSRU=
+cloud.google.com/go v0.44.1/go.mod h1:iSa0KzasP4Uvy3f1mN/7PiObzGgflwredwwASm/v6AU=
+cloud.google.com/go v0.44.2/go.mod h1:60680Gw3Yr4ikxnPRS/oxxkBccT6SA1yMk63TGekxKY=
+cloud.google.com/go v0.45.1/go.mod h1:RpBamKRgapWJb87xiFSdk4g1CME7QZg3uwTez+TSTjc=
+cloud.google.com/go v0.46.3/go.mod h1:a6bKKbmY7er1mI7TEI4lsAkts/mkhTSZK8w33B4RAg0=
+cloud.google.com/go/bigquery v1.0.1/go.mod h1:i/xbL2UlR5RvWAURpBYZTtm/cXjCha9lbfbpx4poX+o=
+cloud.google.com/go/datastore v1.0.0/go.mod h1:LXYbyblFSglQ5pkeyhO+Qmw7ukd3C+pD7TKLgZqpHYE=
+cloud.google.com/go/firestore v1.1.0/go.mod h1:ulACoGHTpvq5r8rxGJ4ddJZBZqakUQqClKRT5SZwBmk=
+cloud.google.com/go/pubsub v1.0.1/go.mod h1:R0Gpsv3s54REJCy4fxDixWD93lHJMoZTyQ2kNxGRt3I=
+cloud.google.com/go/storage v1.0.0/go.mod h1:IhtSnM/ZTZV8YYJWCY8RULGVqBDmpoyjwiyrjsg+URw=
+dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
+github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
 github.com/OneOfOne/xxhash v1.2.2/go.mod h1:HSdplMjZKSmBqAxg5vPj2TmRDmfkzw+cTzAElWljhcU=
 github.com/alecthomas/template v0.0.0-20160405071501-a0175ee3bccc/go.mod h1:LOuyumcjzFXgccqObfd/Ljyb9UuFJ6TxHnclSeseNhc=
 github.com/alecthomas/units v0.0.0-20151022065526-2efee857e7cf/go.mod h1:ybxpYRFXyAe+OPACYpWeL0wqObRcbAqCMya13uyzqw0=
-github.com/armon/consul-api v0.0.0-20180202201655-eb2c6b5be1b6/go.mod h1:grANhF5doyWs3UAsr3K4I6qtAmlQcZDesFNEHPZAzj8=
+github.com/armon/circbuf v0.0.0-20150827004946-bbbad097214e/go.mod h1:3U/XgcO3hCbHZ8TKRvWD2dDTCfh9M9ya+I9JpbB7O8o=
+github.com/armon/go-metrics v0.0.0-20180917152333-f0300d1749da/go.mod h1:Q73ZrmVTwzkszR9V5SSuryQ31EELlFMUz1kKyl939pY=
+github.com/armon/go-radix v0.0.0-20180808171621-7fddfc383310/go.mod h1:ufUuZ+zHj4x4TnLV4JWEpy2hxWSpsRywHrMgIH9cCH8=
 github.com/beorn7/perks v0.0.0-20180321164747-3a771d992973/go.mod h1:Dwedo/Wpr24TaqPxmxbtue+5NUziq4I4S80YR8gNf3Q=
 github.com/beorn7/perks v1.0.0/go.mod h1:KWe93zE9D1o94FZ5RNwFwVgaQK1VOXiVxmqh+CedLV8=
+github.com/bgentry/speakeasy v0.1.0/go.mod h1:+zsyZBPWlz7T6j88CTgSN5bM796AkVf0kBD4zp0CCIs=
+github.com/bketelsen/crypt v0.0.3-0.20200106085610-5cbc8cc4026c/go.mod h1:MKsuJmJgSg28kpZDP6UIiPt0e0Oz0kqKNGyRaWEPv84=
 github.com/cespare/xxhash v1.1.0/go.mod h1:XrSqR1VqqWfGrhpAt58auRo0WTKS1nRRg3ghfAqPWnc=
 github.com/client9/misspell v0.3.4/go.mod h1:qj6jICC3Q7zFZvVWo7KLAzC3yx5G7kyvSDkc90ppPyw=
 github.com/coreos/bbolt v1.3.2/go.mod h1:iRUV2dpdMOn7Bo10OQBFzIJO9kkE559Wcmn+qkEiiKk=
-github.com/coreos/etcd v3.3.10+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
-github.com/coreos/go-semver v0.2.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
+github.com/coreos/etcd v3.3.13+incompatible/go.mod h1:uF7uidLiAD3TWHmW31ZFd/JWoc32PjwdhPthX9715RE=
+github.com/coreos/go-semver v0.3.0/go.mod h1:nnelYz7RCh+5ahJtPPxZlU+153eP4D4r3EedlOD2RNk=
 github.com/coreos/go-systemd v0.0.0-20190321100706-95778dfbb74e/go.mod h1:F5haX7vjVVG0kc13fIWeqUViNPyEJxv/OmvnBo0Yme4=
 github.com/coreos/pkg v0.0.0-20180928190104-399ea9e2e55f/go.mod h1:E3G3o1h8I7cfcXa63jLwjI0eiQQMgzzUDFVpN/nH/eA=
 github.com/cpuguy83/go-md2man/v2 v2.0.0/go.mod h1:maD7wRr/U5Z6m/iR4s+kqSMx2CaBsrgA7czyZG/E6dU=
@@ -26,6 +43,7 @@ github.com/fatih/color v1.9.0 h1:8xPHl4/q1VyqGIPif1F+1V3Y3lSmrq01EabUW3CoW5s=
 github.com/fatih/color v1.9.0/go.mod h1:eQcE1qtQxscV5RaZvpXrrb8Drkc3/DdQ+uUYCNjL+zU=
 github.com/fsnotify/fsnotify v1.4.7/go.mod h1:jwhsz4b93w/PPRr/qN1Yymfu8t87LnFCMoQvtojpjFo=
 github.com/ghodss/yaml v1.0.0/go.mod h1:4dBDuWmgqj2HViK6kFavaiC9ZROes6MMH2rRYeMEF04=
+github.com/go-gl/glfw v0.0.0-20190409004039-e6da0acd62b1/go.mod h1:vR7hzQXu2zJy9AVAgeJqvqgH9Q5CA+iKCZ2gyEVpxRU=
 github.com/go-kit/kit v0.8.0/go.mod h1:xBxKIO96dXMWWy0MnWVtmwkA9/13aqxPnvrjFYMA2as=
 github.com/go-logfmt/logfmt v0.3.0/go.mod h1:Qt1PoO58o5twSAckw1HlFXLmHsOX5/0LbT9GBnD5lWE=
 github.com/go-logfmt/logfmt v0.4.0/go.mod h1:3RMwSq7FuexP4Kalkev3ejPJsZTpXXBr9+V4qmtdjCk=
@@ -39,20 +57,54 @@ github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zV
 github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
 github.com/golang/groupcache v0.0.0-20190129154638-5b532d6fd5ef/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
 github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.2.0/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
+github.com/golang/mock v1.3.1/go.mod h1:sBzyDLLjw3U8JLTeZvSv8jJB+tU5PVekmnlKIyFUx0Y=
 github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
 github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/golang/protobuf v1.3.2/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
+github.com/google/btree v0.0.0-20180813153112-4030bb1f1f0c/go.mod h1:lNA+9X1NB3Zf8V7Ke586lFgjr2dZNuvo3lPJSGZ5JPQ=
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+google.golang.org/genproto v0.0.0-20190911173649-1774047e7e51/go.mod h1:IbNlFCBrqXvoKpeg0TB2l7cyZUmoaFKYIwrEpbDKLA8=
+google.golang.org/genproto v0.0.0-20191108220845-16a3f7862a1a/go.mod h1:n3cpQtvxv34hfy77yVDNjmbRyujviMdxYliBSkLhpCc=
 google.golang.org/grpc v1.19.0/go.mod h1:mqu4LbDTu4XGKhr4mRzUsmM4RtVoemTSY81AxZiDr8c=
-google.golang.org/grpc v1.21.0/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
+google.golang.org/grpc v1.20.1/go.mod h1:10oTOabMzJvdu6/UiuZezV6QK5dSlG84ov/aaiqXj38=
+google.golang.org/grpc v1.21.1/go.mod h1:oYelfM1adQP15Ek0mdvEgi9Df8B9CZIaU1084ijfRaM=
 gopkg.in/alecthomas/kingpin.v2 v2.2.6/go.mod h1:FMv+mEhP44yOT+4EoQTLFTRgOQ1FBLkstjWtayDeSgw=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405 h1:yhCVgyC4o1eVCa2tZl7eS0r+SDo693bJlVdllGtEeKM=
 gopkg.in/check.v1 v0.0.0-20161208181325-20d25e280405/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 h1:qIbj1fsPNlZgppZ+VLlY7N33q108Sa+fhmuc+sWQYwY=
 gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127/go.mod h1:Co6ibVJAznAaIkqp8huTwlJQCZ016jof/cbN4VW5Yz0=
+gopkg.in/errgo.v2 v2.1.0/go.mod h1:hNsd1EY+bozCKY1Ytp96fpM3vjJbqLJn88ws8XvfDNI=
 gopkg.in/go-playground/assert.v1 v1.2.1/go.mod h1:9RXL0bg/zibRAgZUYszZSwO/z8Y/a8bDuhia5mkpMnE=
 gopkg.in/go-playground/validator.v9 v9.30.0/go.mod h1:+c9/zcJMFNgbLvly1L1V+PpxWdVbfP1avr/N00E2vyQ=
+gopkg.in/ini.v1 v1.51.0/go.mod h1:pNLf8WUiyNEtQjuu5G5vTm06TEv9tsIgeAvK8hOrP4k=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473 h1:6D+BvnJ/j6e222UW8s2qTSe3wGBtvo0MbVQG/c5k8RE=
 gopkg.in/op/go-logging.v1 v1.0.0-20160211212156-b2cb9fa56473/go.mod h1:N1eN2tsCx0Ydtgjl4cqmbRCsY4/+z4cYDeqwZTk6zog=
 gopkg.in/resty.v1 v1.12.0/go.mod h1:mDo4pnntr5jdWRML875a/NmxYqAlA73dVijT2AXvQQo=
@@ -183,6 +331,13 @@ gopkg.in/yaml.v2 v2.0.0-20170812160011-eb3733d160e7/go.mod h1:JAlM8MvJe8wmxCU4Bl
 gopkg.in/yaml.v2 v2.2.1/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v2 v2.2.2 h1:ZCJp+EgiOT7lHqUV2J862kp8Qj64Jo6az82+3Td9dZw=
 gopkg.in/yaml.v2 v2.2.2/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.4/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
+gopkg.in/yaml.v2 v2.2.8 h1:obN1ZagJSUGI0Ek/LBmuj4SNLPfIny3KsKFopxRdj10=
+gopkg.in/yaml.v2 v2.2.8/go.mod h1:hI93XBmqTisBFMUTm0b8Fm+jr3Dg1NNxqwp+5A1VGuI=
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776 h1:tQIYjPdBoyREyB9XMu+nnTclpTYkz2zFM+lzLJFO4gQ=
 gopkg.in/yaml.v3 v3.0.0-20200615113413-eeeca48fe776/go.mod h1:K4uyk7z7BCEPqu6E+C64Yfv1cQ7kz7rIZviUmN+EgEM=
 honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.0-20190418001031-e561f6794a2a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+honnef.co/go/tools v0.0.1-2019.2.3/go.mod h1:a3bituU0lyd329TUQxRnasdCoJDkEUEAqEt0JzvZhAg=
+rsc.io/binaryregexp v0.2.0/go.mod h1:qTv7/COck+e2FymRvadv62gMdZztPaShugOCi3I+8D8=
--- a/pkg/yqlib/all_at_once_evaluator.go
+++ b/pkg/yqlib/all_at_once_evaluator.go
@@ -0,0 +1,45 @@
+package yqlib
+
+import "container/list"
+
+/**
+	Loads all yaml documents of all files given into memory, then runs the given expression once.
+**/
+type Evaluator interface {
+	EvaluateFiles(expression string, filenames []string, printer Printer) error
+}
+
+type allAtOnceEvaluator struct {
+	treeNavigator DataTreeNavigator
+	treeCreator   PathTreeCreator
+}
+
+func NewAllAtOnceEvaluator() Evaluator {
+	return &allAtOnceEvaluator{treeNavigator: NewDataTreeNavigator(), treeCreator: NewPathTreeCreator()}
+}
+
+func (e *allAtOnceEvaluator) EvaluateFiles(expression string, filenames []string, printer Printer) error {
+	fileIndex := 0
+	node, err := treeCreator.ParsePath(expression)
+	if err != nil {
+		return err
+	}
+	var allDocuments *list.List = list.New()
+	for _, filename := range filenames {
+		reader, err := readStream(filename)
+		if err != nil {
+			return err
+		}
+		fileDocuments, err := readDocuments(reader, filename, fileIndex)
+		if err != nil {
+			return err
+		}
+		allDocuments.PushBackList(fileDocuments)
+		fileIndex = fileIndex + 1
+	}
+	matches, err := treeNavigator.GetMatchingNodes(allDocuments, node)
+	if err != nil {
+		return err
+	}
+	return printer.PrintResults(matches)
+}
--- a/pkg/yqlib/candidate_node.go
+++ b/pkg/yqlib/candidate_node.go
@@ -6,14 +6,15 @@ import (
 	"strings"

 	"github.com/jinzhu/copier"
-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )

 type CandidateNode struct {
-	Node     *yaml.Node    // the actual node
-	Path     []interface{} /// the path we took to get to this node
-	Document uint          // the document index of this node
-	Filename string
+	Node      *yaml.Node    // the actual node
+	Path      []interface{} /// the path we took to get to this node
+	Document  uint          // the document index of this node
+	Filename  string
+	FileIndex int
 }

 func (n *CandidateNode) GetKey() string {
--- a/pkg/yqlib/constants.go
+++ b/pkg/yqlib/constants.go
@@ -1,5 +0,0 @@
-package yqlib
-
-import "gopkg.in/op/go-logging.v1"
-
-var log = logging.MustGetLogger("yq-lib")
--- a/pkg/yqlib/data_tree_navigator.go
+++ b/pkg/yqlib/data_tree_navigator.go
@@ -5,17 +5,9 @@ import (

 	"container/list"

-	"gopkg.in/op/go-logging.v1"
+	logging "gopkg.in/op/go-logging.v1"
 )

-type dataTreeNavigator struct {
-	navigationPrefs NavigationPrefs
-}
-
-type NavigationPrefs struct {
-	FollowAlias bool
-}
-
 type DataTreeNavigator interface {
 	// given a list of CandidateEntities and a pathNode,
 	// this will process the list against the given pathNode and return
@@ -23,8 +15,11 @@ type DataTreeNavigator interface {
 	GetMatchingNodes(matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error)
 }

-func NewDataTreeNavigator(navigationPrefs NavigationPrefs) DataTreeNavigator {
-	return &dataTreeNavigator{navigationPrefs}
+type dataTreeNavigator struct {
+}
+
+func NewDataTreeNavigator() DataTreeNavigator {
+	return &dataTreeNavigator{}
 }

 func (d *dataTreeNavigator) GetMatchingNodes(matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
--- a/pkg/yqlib/doc/.gitignore
+++ b/pkg/yqlib/doc/.gitignore
@@ -0,0 +1 @@
+*.zip
--- a/pkg/yqlib/doc/Add.md
+++ b/pkg/yqlib/doc/Add.md
@@ -0,0 +1,133 @@
+Add behaves differently according to the type of the LHS:
+- arrays: concatenate
+- number scalars: arithmetic addition (soon)
+- string scalars: concatenate (soon)
+
+Use `+=` as append assign for things like increment. `.a += .x` is equivalent to running `.a |= . + .x`.
+
+## Concatenate and assign arrays
+Given a sample.yml file of:
+```yaml
+a:
+  val: thing
+  b:
+    - cat
+    - dog
+```
+then
+```bash
+yq eval '.a.b += ["cow"]' sample.yml
+```
+will output
+```yaml
+a:
+  val: thing
+  b:
+    - cat
+    - dog
+    - cow
+```
+
+## Concatenate arrays
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+b:
+  - 3
+  - 4
+```
+then
+```bash
+yq eval '.a + .b' sample.yml
+```
+will output
+```yaml
+- 1
+- 2
+- 3
+- 4
+```
+
+## Concatenate null to array
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+```
+then
+```bash
+yq eval '.a + null' sample.yml
+```
+will output
+```yaml
+- 1
+- 2
+```
+
+## Add object to array
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+c:
+  cat: meow
+```
+then
+```bash
+yq eval '.a + .c' sample.yml
+```
+will output
+```yaml
+- 1
+- 2
+- cat: meow
+```
+
+## Add string to array
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+```
+then
+```bash
+yq eval '.a + "hello"' sample.yml
+```
+will output
+```yaml
+- 1
+- 2
+- hello
+```
+
+## Update array (append)
+Given a sample.yml file of:
+```yaml
+a:
+  - 1
+  - 2
+b:
+  - 3
+  - 4
+```
+then
+```bash
+yq eval '.a = .a + .b' sample.yml
+```
+will output
+```yaml
+a:
+  - 1
+  - 2
+  - 3
+  - 4
+b:
+  - 3
+  - 4
+```
+
--- a/pkg/yqlib/doc/Assign.md
+++ b/pkg/yqlib/doc/Assign.md
@@ -5,8 +5,19 @@ Which will assign the LHS node values to the RHS node values. The RHS expression

 ### relative form: `|=`
 This will do a similar thing to the plain form, however, the RHS expression is run against _the LHS nodes_. This is useful for updating values based on old values, e.g. increment.
-## Examples
-### Update parent to be the child value
+## Create yaml file
+Running
+```bash
+yq eval --null-input '.a.b = "cat" | .x = "frog"'
+```
+will output
+```yaml
+a:
+  b: cat
+x: frog
+```
+
+## Update node to be the child value
 Given a sample.yml file of:
 ```yaml
 a:
@@ -23,7 +34,7 @@ a:
  g: foof
 ```

-### Update to be the sibling value
+## Update node to be the sibling value
 Given a sample.yml file of:
 ```yaml
 a:
@@ -40,7 +51,7 @@ a: sibling
 b: sibling
 ```

-### Updated multiple paths
+## Updated multiple paths
 Given a sample.yml file of:
 ```yaml
 a: fieldA
@@ -58,7 +69,7 @@ b: fieldB
 c: potatoe
 ```

-### Update string value
+## Update string value
 Given a sample.yml file of:
 ```yaml
 a:
@@ -74,7 +85,7 @@ a:
  b: frog
 ```

-### Update string value via |=
+## Update string value via |=
 Note there is no difference between `=` and `|=` when the RHS is a scalar

 Given a sample.yml file of:
@@ -92,7 +103,7 @@ a:
  b: frog
 ```

-### Update selected results
+## Update selected results
 Given a sample.yml file of:
 ```yaml
 a:
@@ -101,7 +112,7 @@ a:
 ```
 then
 ```bash
-yq eval '.a[] | select(. == "apple") |= "frog"' sample.yml
+yq eval '(.a.[] | select(. == "apple")) = "frog"' sample.yml
 ```
 will output
 ```yaml
@@ -110,7 +121,7 @@ a:
  c: cactus
 ```

-### Update array values
+## Update array values
 Given a sample.yml file of:
 ```yaml
 - candy
@@ -119,7 +130,7 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '.[] | select(. == "*andy") |= "bogs"' sample.yml
+yq eval '(.[] | select(. == "*andy")) = "bogs"' sample.yml
 ```
 will output
 ```yaml
@@ -128,10 +139,10 @@ will output
 - bogs
 ```

-### Update empty object
+## Update empty object
 Given a sample.yml file of:
 ```yaml
-'': null
+{}
 ```
 then
 ```bash
@@ -139,25 +150,20 @@ yq eval '.a.b |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-'': null
-a:
-  b: bogs
+{a: {b: bogs}}
 ```

-### Update empty object and array
+## Update empty object and array
 Given a sample.yml file of:
 ```yaml
-'': null
+{}
 ```
 then
 ```bash
-yq eval '.a.b[0] |= "bogs"' sample.yml
+yq eval '.a.b.[0] |= "bogs"' sample.yml
 ```
 will output
 ```yaml
-'': null
-a:
-  b:
-    - bogs
+{a: {b: [bogs]}}
 ```

--- a/pkg/yqlib/doc/Boolean
+++ b/pkg/yqlib/doc/Boolean
@@ -0,0 +1,113 @@
+The `or` and `and` operators take two parameters and return a boolean result. `not` flips a boolean from true to false, or vice versa. These are most commonly used with the `select` operator to filter particular nodes.
+## OR example
+Running
+```bash
+yq eval --null-input 'true or false'
+```
+will output
+```yaml
+true
+```
+
+## AND example
+Running
+```bash
+yq eval --null-input 'true and false'
+```
+will output
+```yaml
+false
+```
+
+## Matching nodes with select, equals and or
+Given a sample.yml file of:
+```yaml
+- a: bird
+  b: dog
+- a: frog
+  b: bird
+- a: cat
+  b: fly
+```
+then
+```bash
+yq eval '[.[] | select(.a == "cat" or .b == "dog")]' sample.yml
+```
+will output
+```yaml
+- a: bird
+  b: dog
+- a: cat
+  b: fly
+```
+
+## Not true is false
+Running
+```bash
+yq eval --null-input 'true | not'
+```
+will output
+```yaml
+false
+```
+
+## Not false is true
+Running
+```bash
+yq eval --null-input 'false | not'
+```
+will output
+```yaml
+true
+```
+
+## String values considered to be true
+Running
+```bash
+yq eval --null-input '"cat" | not'
+```
+will output
+```yaml
+false
+```
+
+## Empty string value considered to be true
+Running
+```bash
+yq eval --null-input '"" | not'
+```
+will output
+```yaml
+false
+```
+
+## Numbers are considered to be true
+Running
+```bash
+yq eval --null-input '1 | not'
+```
+will output
+```yaml
+false
+```
+
+## Zero is considered to be true
+Running
+```bash
+yq eval --null-input '0 | not'
+```
+will output
+```yaml
+false
+```
+
+## Null is considered to be false
+Running
+```bash
+yq eval --null-input '~ | not'
+```
+will output
+```yaml
+true
+```
+
--- a/pkg/yqlib/doc/Collect
+++ b/pkg/yqlib/doc/Collect
@@ -3,17 +3,17 @@
 This creates an array using the expression between the square brackets.


-## Examples
-### Collect empty
+## Collect empty
 Running
 ```bash
 yq eval --null-input '[]'
 ```
 will output
 ```yaml
+[]
 ```

-### Collect single
+## Collect single
 Running
 ```bash
 yq eval --null-input '["cat"]'
@@ -23,7 +23,7 @@ will output
 - cat
 ```

-### Collect many
+## Collect many
 Given a sample.yml file of:
 ```yaml
 a: cat
--- a/pkg/yqlib/doc/Collect
+++ b/pkg/yqlib/doc/Collect
@@ -1,15 +1,15 @@
 This is used to construct objects (or maps). This can be used against existing yaml, or to create fresh yaml documents.
-## Examples
-### Collect empty object
+## Collect empty object
 Running
 ```bash
 yq eval --null-input '{}'
 ```
 will output
 ```yaml
+{}
 ```

-### Wrap (prefix) existing object
+## Wrap (prefix) existing object
 Given a sample.yml file of:
 ```yaml
 name: Mike
@@ -24,7 +24,7 @@ wrap:
  name: Mike
 ```

-### Using splat to create multiple objects
+## Using splat to create multiple objects
 Given a sample.yml file of:
 ```yaml
 name: Mike
@@ -34,7 +34,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets[]}' sample.yml
+yq eval '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -42,7 +42,7 @@ Mike: cat
 Mike: dog
 ```

-### Working with multiple documents
+## Working with multiple documents
 Given a sample.yml file of:
 ```yaml
 name: Mike
@@ -57,7 +57,7 @@ pets:
 ```
 then
 ```bash
-yq eval '{.name: .pets[]}' sample.yml
+yq eval '{.name: .pets.[]}' sample.yml
 ```
 will output
 ```yaml
@@ -67,7 +67,7 @@ Rosey: monkey
 Rosey: sheep
 ```

-### Creating yaml from scratch
+## Creating yaml from scratch
 Running
 ```bash
 yq eval --null-input '{"wrap": "frog"}'
--- a/pkg/yqlib/doc/Comments
+++ b/pkg/yqlib/doc/Comments
@@ -1,6 +1,5 @@
 Use these comment operators to set or retrieve comments.
-## Examples
-### Set line comment
+## Set line comment
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -14,7 +13,7 @@ will output
 a: cat # single
 ```

-### Set head comment
+## Set head comment
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -30,7 +29,7 @@ will output
 a: cat
 ```

-### Set foot comment, using an expression
+## Set foot comment, using an expression
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -46,7 +45,7 @@ a: cat
 # cat
 ```

-### Remove comment
+## Remove comment
 Given a sample.yml file of:
 ```yaml
 a: cat # comment
@@ -62,7 +61,7 @@ a: cat
 b: dog # leave this
 ```

-### Remove all comments
+## Remove all comments
 Given a sample.yml file of:
 ```yaml
 a: cat # comment
@@ -76,7 +75,7 @@ will output
 a: cat
 ```

-### Get line comment
+## Get line comment
 Given a sample.yml file of:
 ```yaml
 a: cat # meow
@@ -90,7 +89,7 @@ will output
 meow
 ```

-### Get head comment
+## Get head comment
 Given a sample.yml file of:
 ```yaml
 a: cat # meow
@@ -104,7 +103,7 @@ will output

 ```

-### Get foot comment
+## Get foot comment
 Given a sample.yml file of:
 ```yaml
 a: cat # meow
--- a/pkg/yqlib/doc/Delete.md
+++ b/pkg/yqlib/doc/Delete.md
@@ -1,6 +1,5 @@
 Deletes matching entries in maps or arrays.
-## Examples
-### Delete entry in map
+## Delete entry in map
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -15,7 +14,7 @@ will output
 a: cat
 ```

-### Delete entry in array
+## Delete entry in array
 Given a sample.yml file of:
 ```yaml
 - 1
@@ -32,7 +31,7 @@ will output
 - 3
 ```

-### Delete no matches
+## Delete no matches
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -48,7 +47,7 @@ a: cat
 b: dog
 ```

-### Delete matching entries
+## Delete matching entries
 Given a sample.yml file of:
 ```yaml
 a: cat
--- a/pkg/yqlib/doc/Document
+++ b/pkg/yqlib/doc/Document
@@ -1,6 +1,5 @@
-
-## Examples
-### Retrieve a document index
+Use the `documentIndex` operator to select nodes of a particular document.
+## Retrieve a document index
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -18,7 +17,7 @@ will output
 1
 ```

-### Filter by document index
+## Filter by document index
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -34,7 +33,7 @@ will output
 a: frog
 ```

-### Print Document Index with matches
+## Print Document Index with matches
 Given a sample.yml file of:
 ```yaml
 a: cat
--- a/pkg/yqlib/doc/Equals.md
+++ b/pkg/yqlib/doc/Equals.md
@@ -1,5 +1,3 @@
-## Equals Operator
-
 This is a boolean operator that will return ```true``` if the LHS is equal to the RHS and ``false`` otherwise.

 ```
@@ -13,8 +11,7 @@ select(.a == .b)
 ```


-## Examples
-### Match string
+## Match string
 Given a sample.yml file of:
 ```yaml
 - cat
@@ -32,7 +29,7 @@ true
 false
 ```

-### Match number
+## Match number
 Given a sample.yml file of:
 ```yaml
 - 3
@@ -50,7 +47,7 @@ true
 false
 ```

-### Match nulls
+## Match nulls
 Running
 ```bash
 yq eval --null-input 'null == ~'
--- a/pkg/yqlib/doc/Explode.md
+++ b/pkg/yqlib/doc/Explode.md
@@ -1,6 +1,5 @@
 Explodes (or dereferences) aliases and anchors.
-## Examples
-### Explode alias and anchor
+## Explode alias and anchor
 Given a sample.yml file of:
 ```yaml
 f:
@@ -18,7 +17,7 @@ f:
  b: cat
 ```

-### Explode with no aliases or anchors
+## Explode with no aliases or anchors
 Given a sample.yml file of:
 ```yaml
 a: mike
@@ -32,7 +31,7 @@ will output
 a: mike
 ```

-### Explode with alias keys
+## Explode with alias keys
 Given a sample.yml file of:
 ```yaml
 f:
@@ -50,7 +49,7 @@ f:
  cat: b
 ```

-### Explode with merge anchors
+## Explode with merge anchors
 Given a sample.yml file of:
 ```yaml
 foo: &foo
--- a/pkg/yqlib/doc/File
+++ b/pkg/yqlib/doc/File
@@ -0,0 +1,35 @@
+File operators are most often used with merge when needing to merge specific files together. Note that when doing this, you will need to use `eval-all` to ensure all yaml documents are loaded into memory before performing the merge (as opposed to `eval` which runs the expression once per document).
+
+## Merging files
+Note the use of eval-all to ensure all documents are loaded into memory.
+```bash
+yq eval-all 'select(fileIndex == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
+```
+## Get filename
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval 'filename' sample.yml
+```
+will output
+```yaml
+sample.yaml
+```
+
+## Get file index
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval 'fileIndex' sample.yml
+```
+will output
+```yaml
+0
+```
+
--- a/pkg/yqlib/doc/Has.md
+++ b/pkg/yqlib/doc/Has.md
@@ -0,0 +1,44 @@
+This is operation that returns true if the key exists in a map (or index in an array), false otherwise.
+## Has map key
+Given a sample.yml file of:
+```yaml
+- a: yes
+- a: ~
+- a:
+- b: nope
+```
+then
+```bash
+yq eval '.[] | has("a")' sample.yml
+```
+will output
+```yaml
+true
+true
+true
+false
+```
+
+## Has array index
+Given a sample.yml file of:
+```yaml
+- []
+- [1]
+- [1, 2]
+- [1, null]
+- [1, 2, 3]
+
+```
+then
+```bash
+yq eval '.[] | has(1)' sample.yml
+```
+will output
+```yaml
+false
+false
+true
+true
+true
+```
+
--- a/pkg/yqlib/doc/Length.md
+++ b/pkg/yqlib/doc/Length.md
@@ -0,0 +1,54 @@
+Returns the lengths of the nodes. Length is defined according to the type of the node.
+
+## String length
+returns length of string
+
+Given a sample.yml file of:
+```yaml
+a: cat
+```
+then
+```bash
+yq eval '.a | length' sample.yml
+```
+will output
+```yaml
+3
+```
+
+## Map length
+returns number of entries
+
+Given a sample.yml file of:
+```yaml
+a: cat
+c: dog
+```
+then
+```bash
+yq eval 'length' sample.yml
+```
+will output
+```yaml
+2
+```
+
+## Array length
+returns number of elements
+
+Given a sample.yml file of:
+```yaml
+- 2
+- 4
+- 6
+- 8
+```
+then
+```bash
+yq eval 'length' sample.yml
+```
+will output
+```yaml
+4
+```
+
--- a/pkg/yqlib/doc/Mulitply
+++ b/pkg/yqlib/doc/Mulitply
@@ -1,121 +0,0 @@
-# Mulitply Operator
-## Examples
-### Merge objects together
-sample.yml:
-```yaml
-{a: {also: me}, b: {also: {g: wizz}}}
-```
-Expression
-```bash
-yq '. * {"a":.b}' < sample.yml
-```
-Result
-```yaml
-{a: {also: {g: wizz}}, b: {also: {g: wizz}}}
-```
-### Merge keeps style of LHS
-sample.yml:
-```yaml
-a: {things: great}
-b:
-  also: "me"
-
-```
-Expression
-```bash
-yq '. * {"a":.b}' < sample.yml
-```
-Result
-```yaml
-a: {things: great, also: "me"}
-b:
-  also: "me"
-```
-### Merge arrays
-sample.yml:
-```yaml
-{a: [1,2,3], b: [3,4,5]}
-```
-Expression
-```bash
-yq '. * {"a":.b}' < sample.yml
-```
-Result
-```yaml
-{a: [3, 4, 5], b: [3, 4, 5]}
-```
-### Merge to prefix an element
-sample.yml:
-```yaml
-{a: cat, b: dog}
-```
-Expression
-```bash
-yq '. * {"a": {"c": .a}}' < sample.yml
-```
-Result
-```yaml
-{a: {c: cat}, b: dog}
-```
-### Merge with simple aliases
-sample.yml:
-```yaml
-{a: &cat {c: frog}, b: {f: *cat}, c: {g: thongs}}
-```
-Expression
-```bash
-yq '.c * .b' < sample.yml
-```
-Result
-```yaml
-{g: thongs, f: *cat}
-```
-### Merge does not copy anchor names
-sample.yml:
-```yaml
-{a: {c: &cat frog}, b: {f: *cat}, c: {g: thongs}}
-```
-Expression
-```bash
-yq '.c * .a' < sample.yml
-```
-Result
-```yaml
-{g: thongs, c: frog}
-```
-### Merge with merge anchors
-sample.yml:
-```yaml
-
-foo: &foo
-  a: foo_a
-  thing: foo_thing
-  c: foo_c
-
-bar: &bar
-  b: bar_b
-  thing: bar_thing
-  c: bar_c
-
-foobarList:
-  b: foobarList_b
-  <<: [*foo,*bar]
-  c: foobarList_c
-
-foobar:
-  c: foobar_c
-  <<: *foo
-  thing: foobar_thing
-
-```
-Expression
-```bash
-yq '.foobar * .foobarList' < sample.yml
-```
-Result
-```yaml
-c: foobarList_c
-<<: [*foo, *bar]
-thing: foobar_thing
-b: foobarList_b
-```
--- a/pkg/yqlib/doc/Multiply.md
+++ b/pkg/yqlib/doc/Multiply.md
@@ -2,9 +2,18 @@ Like the multiple operator in `jq`, depending on the operands, this multiply ope

 Upcoming versions of `yq` will add support for other types of multiplication (numbers, strings).

+To concatenate when merging objects, use the `*+` form (see examples below). This will recursively merge objects, appending arrays when it encounters them.
+
 Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
-## Examples
-### Merge objects together, returning merged result only
+
+## Merging files
+Note the use of eval-all to ensure all documents are loaded into memory.
+
+```bash
+yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
+```
+
+## Merge objects together, returning merged result only
 Given a sample.yml file of:
 ```yaml
 a:
@@ -27,7 +36,7 @@ fieldA: cat
 fieldB: dog
 ```

-### Merge objects together, returning parent object
+## Merge objects together, returning parent object
 Given a sample.yml file of:
 ```yaml
 a:
@@ -55,12 +64,13 @@ b:
  fieldB: dog
 ```

-### Merge keeps style of LHS
+## Merge keeps style of LHS
 Given a sample.yml file of:
 ```yaml
 a: {things: great}
 b:
  also: "me"
+
 ```
 then
 ```bash
@@ -73,7 +83,7 @@ b:
  also: "me"
 ```

-### Merge arrays
+## Merge arrays
 Given a sample.yml file of:
 ```yaml
 a:
@@ -101,7 +111,39 @@ b:
  - 5
 ```

-### Merge to prefix an element
+## Merge, appending arrays
+Given a sample.yml file of:
+```yaml
+a:
+  array:
+    - 1
+    - 2
+    - animal: dog
+  value: coconut
+b:
+  array:
+    - 3
+    - 4
+    - animal: cat
+  value: banana
+```
+then
+```bash
+yq eval '.a *+ .b' sample.yml
+```
+will output
+```yaml
+array:
+  - 1
+  - 2
+  - animal: dog
+  - 3
+  - 4
+  - animal: cat
+value: banana
+```
+
+## Merge to prefix an element
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -118,7 +160,7 @@ a:
 b: dog
 ```

-### Merge with simple aliases
+## Merge with simple aliases
 Given a sample.yml file of:
 ```yaml
 a: &cat
@@ -138,7 +180,7 @@ g: thongs
 f: *cat
 ```

-### Merge does not copy anchor names
+## Merge does not copy anchor names
 Given a sample.yml file of:
 ```yaml
 a:
@@ -158,7 +200,7 @@ g: thongs
 c: frog
 ```

-### Merge with merge anchors
+## Merge with merge anchors
 Given a sample.yml file of:
 ```yaml
 foo: &foo
--- a/pkg/yqlib/doc/Not
+++ b/pkg/yqlib/doc/Not
@@ -1,72 +0,0 @@
-This is a boolean operator and will return `true` when given a `false` value (including null), and `false` otherwise.
-## Examples
-### Not true is false
-Running
-```bash
-yq eval --null-input 'true | not'
-```
-will output
-```yaml
-false
-```
-
-### Not false is true
-Running
-```bash
-yq eval --null-input 'false | not'
-```
-will output
-```yaml
-true
-```
-
-### String values considered to be true
-Running
-```bash
-yq eval --null-input '"cat" | not'
-```
-will output
-```yaml
-false
-```
-
-### Empty string value considered to be true
-Running
-```bash
-yq eval --null-input '"" | not'
-```
-will output
-```yaml
-false
-```
-
-### Numbers are considered to be true
-Running
-```bash
-yq eval --null-input '1 | not'
-```
-will output
-```yaml
-false
-```
-
-### Zero is considered to be true
-Running
-```bash
-yq eval --null-input '0 | not'
-```
-will output
-```yaml
-false
-```
-
-### Null is considered to be false
-Running
-```bash
-yq eval --null-input '~ | not'
-```
-will output
-```yaml
-true
-```
-
--- a/pkg/yqlib/doc/Path.md
+++ b/pkg/yqlib/doc/Path.md
@@ -0,0 +1,92 @@
+The path operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
+
+You can get the key/index of matching nodes by using the `path` operator to return the path array then piping that through `.[-1]` to get the last element of that array, the key.
+
+## Map path
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a.b | path' sample.yml
+```
+will output
+```yaml
+- a
+- b
+```
+
+## Get map key
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a.b | path | .[-1]' sample.yml
+```
+will output
+```yaml
+b
+```
+
+## Array path
+Given a sample.yml file of:
+```yaml
+a:
+  - cat
+  - dog
+```
+then
+```bash
+yq eval '.a.[] | select(. == "dog") | path' sample.yml
+```
+will output
+```yaml
+- a
+- 1
+```
+
+## Get array index
+Given a sample.yml file of:
+```yaml
+a:
+  - cat
+  - dog
+```
+then
+```bash
+yq eval '.a.[] | select(. == "dog") | path | .[-1]' sample.yml
+```
+will output
+```yaml
+1
+```
+
+## Print path and value
+Given a sample.yml file of:
+```yaml
+a:
+  - cat
+  - dog
+  - frog
+```
+then
+```bash
+yq eval '.a.[] | select(. == "*og") | [{"path":path, "value":.}]' sample.yml
+```
+will output
+```yaml
+- path:
+    - a
+    - 1
+  value: dog
+- path:
+    - a
+    - 2
+  value: frog
+```
+
--- a/pkg/yqlib/doc/Pipe.md
+++ b/pkg/yqlib/doc/Pipe.md
@@ -0,0 +1,35 @@
+Pipe the results of an expression into another. Like the bash operator.
+
+## Simple Pipe
+Given a sample.yml file of:
+```yaml
+a:
+  b: cat
+```
+then
+```bash
+yq eval '.a | .b' sample.yml
+```
+will output
+```yaml
+cat
+```
+
+## Multiple updates
+Given a sample.yml file of:
+```yaml
+a: cow
+b: sheep
+c: same
+```
+then
+```bash
+yq eval '.a = "cat" | .b = "dog"' sample.yml
+```
+will output
+```yaml
+a: cat
+b: dog
+c: same
+```
+
--- a/pkg/yqlib/doc/Recursive
+++ b/pkg/yqlib/doc/Recursive
@@ -3,69 +3,7 @@ This operator recursively matches all children nodes given of a particular eleme
 ```bash
 yq eval '.. style= "flow"' file.yaml
 ```
-## Examples
-### Map
-Given a sample.yml file of:
-```yaml
-a:
-  b: apple
-```
-then
-```bash
-yq eval '..' sample.yml
-```
-will output
-```yaml
-a:
-  b: apple
-b: apple
-apple
-```
-
-### Array
-Given a sample.yml file of:
-```yaml
- 1
- 2
- 3
-```
-then
-```bash
-yq eval '..' sample.yml
-```
-will output
-```yaml
- 1
- 2
- 3
-1
-2
-3
-```
-
-### Array of maps
-Given a sample.yml file of:
-```yaml
- a: cat
- 2
- true
-```
-then
-```bash
-yq eval '..' sample.yml
-```
-will output
-```yaml
- a: cat
- 2
- true
-a: cat
-cat
-2
-true
-```
-
-### Aliases are not traversed
+## Aliases are not traversed
 Given a sample.yml file of:
 ```yaml
 a: &cat
@@ -74,20 +12,20 @@ b: *cat
 ```
 then
 ```bash
-yq eval '..' sample.yml
+yq eval '[..]' sample.yml
 ```
 will output
 ```yaml
-a: &cat
+- a: &cat
+    c: frog
+  b: *cat
+- &cat
  c: frog
-b: *cat
-&cat
-c: frog
-frog
-*cat
+- frog
+- *cat
 ```

-### Merge docs are not traversed
+## Merge docs are not traversed
 Given a sample.yml file of:
 ```yaml
 foo: &foo
@@ -111,15 +49,15 @@ foobar:
 ```
 then
 ```bash
-yq eval '.foobar | ..' sample.yml
+yq eval '.foobar | [..]' sample.yml
 ```
 will output
 ```yaml
-c: foobar_c
-!!merge <<: *foo
-thing: foobar_thing
-foobar_c
-*foo
-foobar_thing
+- c: foobar_c
+  !!merge <<: *foo
+  thing: foobar_thing
+- foobar_c
+- *foo
+- foobar_thing
 ```

--- a/pkg/yqlib/doc/Select.md
+++ b/pkg/yqlib/doc/Select.md
@@ -1,6 +1,5 @@
 Select is used to filter arrays and maps by a boolean expression.
-## Examples
-### Select elements from array
+## Select elements from array
 Given a sample.yml file of:
 ```yaml
 - cat
@@ -17,7 +16,7 @@ cat
 goat
 ```

-### Select and update matching values in map
+## Select and update matching values in map
 Given a sample.yml file of:
 ```yaml
 a:
@@ -27,7 +26,7 @@ a:
 ```
 then
 ```bash
-yq eval '(.a[] | select(. == "*at")) |= "rabbit"' sample.yml
+yq eval '(.a.[] | select(. == "*at")) |= "rabbit"' sample.yml
 ```
 will output
 ```yaml
--- a/pkg/yqlib/doc/Sort
+++ b/pkg/yqlib/doc/Sort
@@ -0,0 +1,68 @@
+The Sort Keys operator sorts maps by their keys (based on their string value). This operator does not do anything to arrays or scalars (so you can easily recursively apply it to all maps).
+
+Sort is particularly useful for diffing two different yaml documents:
+
+```bash
+yq eval -i 'sortKeys(..)' file1.yml
+yq eval -i 'sortKeys(..)' file2.yml
+diff file1.yml file2.yml
+```
+
+## Sort keys of map
+Given a sample.yml file of:
+```yaml
+c: frog
+a: blah
+b: bing
+```
+then
+```bash
+yq eval 'sortKeys(.)' sample.yml
+```
+will output
+```yaml
+a: blah
+b: bing
+c: frog
+```
+
+## Sort keys recursively
+Note the array elements are left unsorted, but maps inside arrays are sorted
+
+Given a sample.yml file of:
+```yaml
+bParent:
+  c: dog
+  array:
+    - 3
+    - 1
+    - 2
+aParent:
+  z: donkey
+  x:
+    - c: yum
+      b: delish
+    - b: ew
+      a: apple
+```
+then
+```bash
+yq eval 'sortKeys(..)' sample.yml
+```
+will output
+```yaml
+aParent:
+  x:
+    - b: delish
+      c: yum
+    - a: apple
+      b: ew
+  z: donkey
+bParent:
+  array:
+    - 3
+    - 1
+    - 2
+  c: dog
+```
+
--- a/pkg/yqlib/doc/Style.md
+++ b/pkg/yqlib/doc/Style.md
@@ -1,6 +1,5 @@
 The style operator can be used to get or set the style of nodes (e.g. string style, yaml style)
-## Examples
-### Set tagged style
+## Set tagged style
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -21,7 +20,7 @@ c: !!float 3.2
 e: !!bool true
 ```

-### Set double quote style
+## Set double quote style
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -41,7 +40,7 @@ c: "3.2"
 e: "true"
 ```

-### Set single quote style
+## Set single quote style
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -61,7 +60,7 @@ c: '3.2'
 e: 'true'
 ```

-### Set literal quote style
+## Set literal quote style
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -85,7 +84,7 @@ e: |-
  true
 ```

-### Set folded quote style
+## Set folded quote style
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -109,7 +108,7 @@ e: >-
  true
 ```

-### Set flow quote style
+## Set flow quote style
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -126,7 +125,9 @@ will output
 {a: cat, b: 5, c: 3.2, e: true}
 ```

-### Set empty (default) quote style
+## Pretty print
+Set empty (default) quote style
+
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -146,11 +147,10 @@ c: 3.2
 e: true
 ```

-### Read style
+## Read style
 Given a sample.yml file of:
 ```yaml
-a: cat
-b: thing
+{a: "cat", b: 'thing'}
 ```
 then
 ```bash
@@ -158,8 +158,8 @@ yq eval '.. | style' sample.yml
 ```
 will output
 ```yaml
-
-
-
+flow
+double
+single
 ```

--- a/pkg/yqlib/doc/Tag.md
+++ b/pkg/yqlib/doc/Tag.md
@@ -1,6 +1,5 @@
-The tag operator can be used to get or set the tag of ndoes (e.g. `!!str`, `!!int`, `!!bool`).
-## Examples
-### Get tag
+The tag operator can be used to get or set the tag of nodes (e.g. `!!str`, `!!int`, `!!bool`).
+## Get tag
 Given a sample.yml file of:
 ```yaml
 a: cat
@@ -23,7 +22,7 @@ will output
 !!seq
 ```

-### Convert numbers to strings
+## Convert numbers to strings
 Given a sample.yml file of:
 ```yaml
 a: cat
--- a/pkg/yqlib/doc/Traverse.md
+++ b/pkg/yqlib/doc/Traverse.md
@@ -1,6 +1,5 @@
-This is the simples (and perhaps most used) operator, it is used to navigate deeply into yaml structurse.
-## Examples
-### Simple map navigation
+This is the simplest (and perhaps most used) operator, it is used to navigate deeply into yaml structurse.
+## Simple map navigation
 Given a sample.yml file of:
 ```yaml
 a:
@@ -15,7 +14,7 @@ will output
 b: apple
 ```

-### Splat
+## Splat
 Often used to pipe children into other operators

 Given a sample.yml file of:
@@ -33,7 +32,23 @@ b: apple
 c: banana
 ```

-### Children don't exist
+## Special characters
+Use quotes around path elements with special characters
+
+Given a sample.yml file of:
+```yaml
+"{}": frog
+```
+then
+```bash
+yq eval '."{}"' sample.yml
+```
+will output
+```yaml
+frog
+```
+
+## Children don't exist
 Nodes are added dynamically while traversing

 Given a sample.yml file of:
@@ -49,7 +64,7 @@ will output
 null
 ```

-### Wildcard matching
+## Wildcard matching
 Given a sample.yml file of:
 ```yaml
 a:
@@ -66,7 +81,7 @@ apple
 things
 ```

-### Aliases
+## Aliases
 Given a sample.yml file of:
 ```yaml
 a: &cat
@@ -82,7 +97,7 @@ will output
 *cat
 ```

-### Traversing aliases with splat
+## Traversing aliases with splat
 Given a sample.yml file of:
 ```yaml
 a: &cat
@@ -98,7 +113,7 @@ will output
 frog
 ```

-### Traversing aliases explicitly
+## Traversing aliases explicitly
 Given a sample.yml file of:
 ```yaml
 a: &cat
@@ -114,7 +129,7 @@ will output
 frog
 ```

-### Traversing arrays by index
+## Traversing arrays by index
 Given a sample.yml file of:
 ```yaml
 - 1
@@ -123,42 +138,42 @@ Given a sample.yml file of:
 ```
 then
 ```bash
-yq eval '[0]' sample.yml
+yq eval '.[0]' sample.yml
 ```
 will output
 ```yaml
 1
 ```

-### Maps with numeric keys
+## Maps with numeric keys
 Given a sample.yml file of:
 ```yaml
 2: cat
 ```
 then
 ```bash
-yq eval '[2]' sample.yml
+yq eval '.[2]' sample.yml
 ```
 will output
 ```yaml
 cat
 ```

-### Maps with non existing numeric keys
+## Maps with non existing numeric keys
 Given a sample.yml file of:
 ```yaml
 a: b
 ```
 then
 ```bash
-yq eval '[0]' sample.yml
+yq eval '.[0]' sample.yml
 ```
 will output
 ```yaml
 null
 ```

-### Traversing merge anchors
+## Traversing merge anchors
 Given a sample.yml file of:
 ```yaml
 foo: &foo
@@ -189,7 +204,7 @@ will output
 foo_a
 ```

-### Traversing merge anchors with override
+## Traversing merge anchors with override
 Given a sample.yml file of:
 ```yaml
 foo: &foo
@@ -220,7 +235,7 @@ will output
 foo_c
 ```

-### Traversing merge anchors with local override
+## Traversing merge anchors with local override
 Given a sample.yml file of:
 ```yaml
 foo: &foo
@@ -251,7 +266,7 @@ will output
 foobar_thing
 ```

-### Splatting merge anchors
+## Splatting merge anchors
 Given a sample.yml file of:
 ```yaml
 foo: &foo
@@ -284,7 +299,7 @@ foo_a
 foobar_thing
 ```

-### Traversing merge anchor lists
+## Traversing merge anchor lists
 Note that the later merge anchors override previous

 Given a sample.yml file of:
@@ -317,7 +332,7 @@ will output
 bar_thing
 ```

-### Splatting merge anchor lists
+## Splatting merge anchor lists
 Given a sample.yml file of:
 ```yaml
 foo: &foo
--- a/pkg/yqlib/doc/Union.md
+++ b/pkg/yqlib/doc/Union.md
@@ -1,6 +1,5 @@
 This operator is used to combine different results together.
-## Examples
-### Combine scalars
+## Combine scalars
 Running
 ```bash
 yq eval --null-input '1, true, "cat"'
@@ -12,7 +11,7 @@ true
 cat
 ```

-### Combine selected paths
+## Combine selected paths
 Given a sample.yml file of:
 ```yaml
 a: fieldA
--- a/pkg/yqlib/doc/aa.md
+++ b/pkg/yqlib/doc/aa.md
--- a/pkg/yqlib/doc/headers/Add.md
+++ b/pkg/yqlib/doc/headers/Add.md
@@ -0,0 +1,6 @@
+Add behaves differently according to the type of the LHS:
+- arrays: concatenate
+- number scalars: arithmetic addition (soon)
+- string scalars: concatenate (soon)
+
+Use `+=` as append assign for things like increment. `.a += .x` is equivalent to running `.a |= . + .x`.
--- a/pkg/yqlib/doc/headers/Assign.md
+++ b/pkg/yqlib/doc/headers/Assign.md
--- a/pkg/yqlib/doc/headers/Boolean
+++ b/pkg/yqlib/doc/headers/Boolean
@@ -0,0 +1 @@
+The `or` and `and` operators take two parameters and return a boolean result. `not` flips a boolean from true to false, or vice versa. These are most commonly used with the `select` operator to filter particular nodes.
--- a/pkg/yqlib/doc/headers/Comments
+++ b/pkg/yqlib/doc/headers/Comments
--- a/pkg/yqlib/doc/headers/Delete.md
+++ b/pkg/yqlib/doc/headers/Delete.md
--- a/pkg/yqlib/doc/headers/Document
+++ b/pkg/yqlib/doc/headers/Document
@@ -0,0 +1 @@
+Use the `documentIndex` operator to select nodes of a particular document.
--- a/pkg/yqlib/doc/headers/Equals.md
+++ b/pkg/yqlib/doc/headers/Equals.md
@@ -1,5 +1,3 @@
-## Equals Operator
-
 This is a boolean operator that will return ```true``` if the LHS is equal to the RHS and ``false`` otherwise.

 ```
--- a/pkg/yqlib/doc/headers/Explode.md
+++ b/pkg/yqlib/doc/headers/Explode.md
--- a/pkg/yqlib/doc/headers/File
+++ b/pkg/yqlib/doc/headers/File
@@ -0,0 +1,7 @@
+File operators are most often used with merge when needing to merge specific files together. Note that when doing this, you will need to use `eval-all` to ensure all yaml documents are loaded into memory before performing the merge (as opposed to `eval` which runs the expression once per document).
+
+## Merging files
+Note the use of eval-all to ensure all documents are loaded into memory.
+```bash
+yq eval-all 'select(fileIndex == 0) * select(filename == "file2.yaml")' file1.yaml file2.yaml
+```
--- a/pkg/yqlib/doc/headers/Has.md
+++ b/pkg/yqlib/doc/headers/Has.md
@@ -0,0 +1 @@
+This is operation that returns true if the key exists in a map (or index in an array), false otherwise.
--- a/pkg/yqlib/doc/headers/Length.md
+++ b/pkg/yqlib/doc/headers/Length.md
@@ -0,0 +1 @@
+Returns the lengths of the nodes. Length is defined according to the type of the node.
--- a/pkg/yqlib/doc/headers/Multiply.md
+++ b/pkg/yqlib/doc/headers/Multiply.md
@@ -2,4 +2,13 @@ Like the multiple operator in `jq`, depending on the operands, this multiply ope

 Upcoming versions of `yq` will add support for other types of multiplication (numbers, strings).

-Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
+To concatenate when merging objects, use the `*+` form (see examples below). This will recursively merge objects, appending arrays when it encounters them.
+
+Note that when merging objects, this operator returns the merged object (not the parent). This will be clearer in the examples below.
+
+## Merging files
+Note the use of eval-all to ensure all documents are loaded into memory.
+
+```bash
+yq eval-all 'select(fileIndex == 0) * select(fileIndex == 1)' file1.yaml file2.yaml
+```
--- a/pkg/yqlib/doc/headers/Not
+++ b/pkg/yqlib/doc/headers/Not
@@ -1 +0,0 @@
-This is a boolean operator and will return `true` when given a `false` value (including null), and `false` otherwise.
--- a/pkg/yqlib/doc/headers/Path.md
+++ b/pkg/yqlib/doc/headers/Path.md
@@ -0,0 +1,3 @@
+The path operator can be used to get the traversal paths of matching nodes in an expression. The path is returned as an array, which if traversed in order will lead to the matching node.
+
+You can get the key/index of matching nodes by using the `path` operator to return the path array then piping that through `.[-1]` to get the last element of that array, the key.
--- a/pkg/yqlib/doc/headers/Pipe.md
+++ b/pkg/yqlib/doc/headers/Pipe.md
@@ -0,0 +1 @@
+Pipe the results of an expression into another. Like the bash operator.
--- a/pkg/yqlib/doc/headers/Recursive
+++ b/pkg/yqlib/doc/headers/Recursive
--- a/pkg/yqlib/doc/headers/Select.md
+++ b/pkg/yqlib/doc/headers/Select.md
--- a/pkg/yqlib/doc/headers/Sort
+++ b/pkg/yqlib/doc/headers/Sort
@@ -0,0 +1,9 @@
+The Sort Keys operator sorts maps by their keys (based on their string value). This operator does not do anything to arrays or scalars (so you can easily recursively apply it to all maps).
+
+Sort is particularly useful for diffing two different yaml documents:
+
+```bash
+yq eval -i 'sortKeys(..)' file1.yml
+yq eval -i 'sortKeys(..)' file2.yml
+diff file1.yml file2.yml
+```
--- a/pkg/yqlib/doc/headers/Style.md
+++ b/pkg/yqlib/doc/headers/Style.md
--- a/pkg/yqlib/doc/headers/Tag
+++ b/pkg/yqlib/doc/headers/Tag
@@ -1 +0,0 @@
-The tag operator can be used to get or set the tag of ndoes (e.g. `!!str`, `!!int`, `!!bool`).
--- a/pkg/yqlib/doc/headers/Tag.md
+++ b/pkg/yqlib/doc/headers/Tag.md
@@ -0,0 +1 @@
+The tag operator can be used to get or set the tag of nodes (e.g. `!!str`, `!!int`, `!!bool`).
--- a/pkg/yqlib/doc/headers/Traverse
+++ b/pkg/yqlib/doc/headers/Traverse
@@ -1 +0,0 @@
-This is the simples (and perhaps most used) operator, it is used to navigate deeply into yaml structurse.
--- a/pkg/yqlib/doc/headers/Traverse.md
+++ b/pkg/yqlib/doc/headers/Traverse.md
@@ -0,0 +1 @@
+This is the simplest (and perhaps most used) operator, it is used to navigate deeply into yaml structurse.
--- a/pkg/yqlib/doc/headers/Union.md
+++ b/pkg/yqlib/doc/headers/Union.md
--- a/pkg/yqlib/encoder_test.go
+++ b/pkg/yqlib/encoder_test.go
@@ -32,7 +32,7 @@ func TestJsonEncoderPreservesObjectOrder(t *testing.T) {
 	writer := bufio.NewWriter(&output)

 	var jsonEncoder = NewJsonEncoder(writer, 2)
-	inputs, err := readDocuments(strings.NewReader(sampleYaml), "sample.yml")
+	inputs, err := readDocuments(strings.NewReader(sampleYaml), "sample.yml", 0)
 	if err != nil {
 		panic(err)
 	}
--- a/pkg/yqlib/file_utils.go
+++ b/pkg/yqlib/file_utils.go
@@ -0,0 +1,50 @@
+package yqlib
+
+import (
+	"io"
+	"os"
+)
+
+func safelyRenameFile(from string, to string) {
+	if renameError := os.Rename(from, to); renameError != nil {
+		log.Debugf("Error renaming from %v to %v, attempting to copy contents", from, to)
+		log.Debug(renameError.Error())
+		// can't do this rename when running in docker to a file targeted in a mounted volume,
+		// so gracefully degrade to copying the entire contents.
+		if copyError := copyFileContents(from, to); copyError != nil {
+			log.Errorf("Failed copying from %v to %v", from, to)
+			log.Error(copyError.Error())
+		} else {
+			removeErr := os.Remove(from)
+			if removeErr != nil {
+				log.Errorf("failed removing original file: %s", from)
+			}
+		}
+	}
+}
+
+// thanks https://stackoverflow.com/questions/21060945/simple-way-to-copy-a-file-in-golang
+func copyFileContents(src, dst string) (err error) {
+	in, err := os.Open(src) // nolint gosec
+	if err != nil {
+		return err
+	}
+	defer safelyCloseFile(in)
+	out, err := os.Create(dst)
+	if err != nil {
+		return err
+	}
+	defer safelyCloseFile(out)
+	if _, err = io.Copy(out, in); err != nil {
+		return err
+	}
+	return out.Sync()
+}
+
+func safelyCloseFile(file *os.File) {
+	err := file.Close()
+	if err != nil {
+		log.Error("Error closing file!")
+		log.Error(err.Error())
+	}
+}
--- a/pkg/yqlib/lib.go
+++ b/pkg/yqlib/lib.go
@@ -9,6 +9,8 @@ import (
 	yaml "gopkg.in/yaml.v3"
 )

+var log = logging.MustGetLogger("yq-lib")
+
 type OperationType struct {
 	Type       string
 	NumArgs    uint // number of arguments to the op
@@ -17,33 +19,31 @@ type OperationType struct {
 }

 // operators TODO:
-// - get path operator (like doc index)
-// - get file index op (like doc index)
-// - get file name op (like doc index)
-// - write in place
-// - mergeAppend (merges and appends arrays)
+// - cookbook doc for common things
 // - mergeEmpty (sets only if the document is empty, do I do that now?)
-// - compare ??
-// - validate ??
-// - exists

 var Or = &OperationType{Type: "OR", NumArgs: 2, Precedence: 20, Handler: OrOperator}
 var And = &OperationType{Type: "AND", NumArgs: 2, Precedence: 20, Handler: AndOperator}

 var Union = &OperationType{Type: "UNION", NumArgs: 2, Precedence: 10, Handler: UnionOperator}

+var Pipe = &OperationType{Type: "PIPE", NumArgs: 2, Precedence: 30, Handler: PipeOperator}
+
 var Assign = &OperationType{Type: "ASSIGN", NumArgs: 2, Precedence: 40, Handler: AssignUpdateOperator}
+var AddAssign = &OperationType{Type: "ADD_ASSIGN", NumArgs: 2, Precedence: 40, Handler: AddAssignOperator}

 var AssignAttributes = &OperationType{Type: "ASSIGN_ATTRIBUTES", NumArgs: 2, Precedence: 40, Handler: AssignAttributesOperator}
 var AssignStyle = &OperationType{Type: "ASSIGN_STYLE", NumArgs: 2, Precedence: 40, Handler: AssignStyleOperator}
 var AssignTag = &OperationType{Type: "ASSIGN_TAG", NumArgs: 2, Precedence: 40, Handler: AssignTagOperator}
 var AssignComment = &OperationType{Type: "ASSIGN_COMMENT", NumArgs: 2, Precedence: 40, Handler: AssignCommentsOperator}

-var Multiply = &OperationType{Type: "MULTIPLY", NumArgs: 2, Precedence: 40, Handler: MultiplyOperator}
+var Multiply = &OperationType{Type: "MULTIPLY", NumArgs: 2, Precedence: 45, Handler: MultiplyOperator}
+var Add = &OperationType{Type: "ADD", NumArgs: 2, Precedence: 45, Handler: AddOperator}

 var Equals = &OperationType{Type: "EQUALS", NumArgs: 2, Precedence: 40, Handler: EqualsOperator}
 var CreateMap = &OperationType{Type: "CREATE_MAP", NumArgs: 2, Precedence: 40, Handler: CreateMapOperator}
-var Pipe = &OperationType{Type: "PIPE", NumArgs: 2, Precedence: 45, Handler: PipeOperator}
+
+var ShortPipe = &OperationType{Type: "SHORT_PIPE", NumArgs: 2, Precedence: 45, Handler: PipeOperator}

 var Length = &OperationType{Type: "LENGTH", NumArgs: 0, Precedence: 50, Handler: LengthOperator}
 var Collect = &OperationType{Type: "COLLECT", NumArgs: 0, Precedence: 50, Handler: CollectOperator}
@@ -51,8 +51,12 @@ var GetStyle = &OperationType{Type: "GET_STYLE", NumArgs: 0, Precedence: 50, Han
 var GetTag = &OperationType{Type: "GET_TAG", NumArgs: 0, Precedence: 50, Handler: GetTagOperator}
 var GetComment = &OperationType{Type: "GET_COMMENT", NumArgs: 0, Precedence: 50, Handler: GetCommentsOperator}
 var GetDocumentIndex = &OperationType{Type: "GET_DOCUMENT_INDEX", NumArgs: 0, Precedence: 50, Handler: GetDocumentIndexOperator}
+var GetFilename = &OperationType{Type: "GET_FILENAME", NumArgs: 0, Precedence: 50, Handler: GetFilenameOperator}
+var GetFileIndex = &OperationType{Type: "GET_FILE_INDEX", NumArgs: 0, Precedence: 50, Handler: GetFileIndexOperator}
+var GetPath = &OperationType{Type: "GET_PATH", NumArgs: 0, Precedence: 50, Handler: GetPathOperator}

 var Explode = &OperationType{Type: "EXPLODE", NumArgs: 1, Precedence: 50, Handler: ExplodeOperator}
+var SortKeys = &OperationType{Type: "SORT_KEYS", NumArgs: 1, Precedence: 50, Handler: SortKeysOperator}

 var CollectObject = &OperationType{Type: "COLLECT_OBJECT", NumArgs: 0, Precedence: 50, Handler: CollectObjectOperator}
 var TraversePath = &OperationType{Type: "TRAVERSE_PATH", NumArgs: 0, Precedence: 50, Handler: TraversePathOperator}
@@ -66,11 +70,9 @@ var Empty = &OperationType{Type: "EMPTY", NumArgs: 50, Handler: EmptyOperator}
 var RecursiveDescent = &OperationType{Type: "RECURSIVE_DESCENT", NumArgs: 0, Precedence: 50, Handler: RecursiveDescentOperator}

 var Select = &OperationType{Type: "SELECT", NumArgs: 1, Precedence: 50, Handler: SelectOperator}
+var Has = &OperationType{Type: "HAS", NumArgs: 1, Precedence: 50, Handler: HasOperator}
 var DeleteChild = &OperationType{Type: "DELETE", NumArgs: 1, Precedence: 40, Handler: DeleteChildOperator}

-// var Exists = &OperationType{Type: "Length", NumArgs: 2, Precedence: 35}
-// filters matches if they have the existing path
-
 type Operation struct {
 	OperationType *OperationType
 	Value         interface{}
--- a/pkg/yqlib/operator_add.go
+++ b/pkg/yqlib/operator_add.go
@@ -0,0 +1,83 @@
+package yqlib
+
+import (
+	"fmt"
+
+	"container/list"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func createSelfAddOp(rhs *PathTreeNode) *PathTreeNode {
+	return &PathTreeNode{Operation: &Operation{OperationType: Add},
+		Lhs: &PathTreeNode{Operation: &Operation{OperationType: SelfReference}},
+		Rhs: rhs}
+}
+
+func AddAssignOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	assignmentOp := &Operation{OperationType: Assign}
+	assignmentOp.Preferences = &AssignOpPreferences{true}
+
+	assignmentOpNode := &PathTreeNode{Operation: assignmentOp, Lhs: pathNode.Lhs, Rhs: createSelfAddOp(pathNode.Rhs)}
+	return d.GetMatchingNodes(matchingNodes, assignmentOpNode)
+}
+
+func toNodes(candidates *list.List) []*yaml.Node {
+
+	if candidates.Len() == 0 {
+		return []*yaml.Node{}
+	}
+	candidate := candidates.Front().Value.(*CandidateNode)
+
+	if candidate.Node.Tag == "!!null" {
+		return []*yaml.Node{}
+	}
+
+	switch candidate.Node.Kind {
+	case yaml.SequenceNode:
+		return candidate.Node.Content
+	default:
+		return []*yaml.Node{candidate.Node}
+	}
+
+}
+
+func AddOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("Add operator")
+	var results = list.New()
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
+	if err != nil {
+		return nil, err
+	}
+	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+
+	if err != nil {
+		return nil, err
+	}
+
+	for el := lhs.Front(); el != nil; el = el.Next() {
+		lhsCandidate := el.Value.(*CandidateNode)
+		lhsNode := UnwrapDoc(lhsCandidate.Node)
+
+		target := &CandidateNode{
+			Path:     lhsCandidate.Path,
+			Document: lhsCandidate.Document,
+			Filename: lhsCandidate.Filename,
+			Node:     &yaml.Node{},
+		}
+
+		switch lhsNode.Kind {
+		case yaml.MappingNode:
+			return nil, fmt.Errorf("Maps not yet supported for addition")
+		case yaml.SequenceNode:
+			target.Node.Kind = yaml.SequenceNode
+			target.Node.Style = lhsNode.Style
+			target.Node.Tag = "!!seq"
+			target.Node.Content = append(lhsNode.Content, toNodes(rhs)...)
+			results.PushBack(target)
+		case yaml.ScalarNode:
+			return nil, fmt.Errorf("Scalars not yet supported for addition")
+		}
+	}
+	return results, nil
+}
--- a/pkg/yqlib/operator_add_test.go
+++ b/pkg/yqlib/operator_add_test.go
@@ -0,0 +1,63 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var addOperatorScenarios = []expressionScenario{
+	{
+		description: "Concatenate and assign arrays",
+		document:    `{a: {val: thing, b: [cat,dog]}}`,
+		expression:  ".a.b += [\"cow\"]",
+		expected: []string{
+			"D0, P[], (doc)::{a: {val: thing, b: [cat, dog, cow]}}\n",
+		},
+	},
+	{
+		description: "Concatenate arrays",
+		document:    `{a: [1,2], b: [3,4]}`,
+		expression:  `.a + .b`,
+		expected: []string{
+			"D0, P[a], (!!seq)::[1, 2, 3, 4]\n",
+		},
+	},
+	{
+		description: "Concatenate null to array",
+		document:    `{a: [1,2]}`,
+		expression:  `.a + null`,
+		expected: []string{
+			"D0, P[a], (!!seq)::[1, 2]\n",
+		},
+	},
+	{
+		description: "Add object to array",
+		document:    `{a: [1,2], c: {cat: meow}}`,
+		expression:  `.a + .c`,
+		expected: []string{
+			"D0, P[a], (!!seq)::[1, 2, {cat: meow}]\n",
+		},
+	},
+	{
+		description: "Add string to array",
+		document:    `{a: [1,2]}`,
+		expression:  `.a + "hello"`,
+		expected: []string{
+			"D0, P[a], (!!seq)::[1, 2, hello]\n",
+		},
+	},
+	{
+		description: "Update array (append)",
+		document:    `{a: [1,2], b: [3,4]}`,
+		expression:  `.a = .a + .b`,
+		expected: []string{
+			"D0, P[], (doc)::{a: [1, 2, 3, 4], b: [3, 4]}\n",
+		},
+	},
+}
+
+func TestAddOperatorScenarios(t *testing.T) {
+	for _, tt := range addOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Add", addOperatorScenarios)
+}
--- a/pkg/yqlib/operator_assign.go
+++ b/pkg/yqlib/operator_assign.go
@@ -36,6 +36,11 @@ func AssignUpdateOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNo
 			candidate.UpdateFrom(first.Value.(*CandidateNode))
 		}
 	}
+	// // if there was nothing given, perhaps we are creating a new yaml doc
+	// if matchingNodes.Len() == 0 {
+	// 	log.Debug("started with nothing, returning LHS, %v", lhs.Len())
+	// 	return lhs, nil
+	// }
 	return matchingNodes, nil
 }

--- a/pkg/yqlib/operator_assign_test.go
+++ b/pkg/yqlib/operator_assign_test.go
@@ -6,7 +6,14 @@ import (

 var assignOperatorScenarios = []expressionScenario{
 	{
-		description: "Update parent to be the child value",
+		description: "Create yaml file",
+		expression:  `.a.b = "cat" | .x = "frog"`,
+		expected: []string{
+			"D0, P[], ()::a:\n    b: cat\nx: frog\n",
+		},
+	},
+	{
+		description: "Update node to be the child value",
 		document:    `{a: {b: {g: foof}}}`,
 		expression:  `.a |= .b`,
 		expected: []string{
@@ -14,7 +21,7 @@ var assignOperatorScenarios = []expressionScenario{
 		},
 	},
 	{
-		description: "Update to be the sibling value",
+		description: "Update node to be the sibling value",
 		document:    `{a: {b: child}, b: sibling}`,
 		expression:  `.a = .b`,
 		expected: []string{
@@ -73,7 +80,7 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		description: "Update selected results",
 		document:    `{a: {b: apple, c: cactus}}`,
-		expression:  `.a[] | select(. == "apple") |= "frog"`,
+		expression:  `(.a.[] | select(. == "apple")) = "frog"`,
 		expected: []string{
 			"D0, P[], (doc)::{a: {b: frog, c: cactus}}\n",
 		},
@@ -81,23 +88,25 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		description: "Update array values",
 		document:    `[candy, apple, sandy]`,
-		expression:  `.[] | select(. == "*andy") |= "bogs"`,
+		expression:  `(.[] | select(. == "*andy")) = "bogs"`,
 		expected: []string{
 			"D0, P[], (doc)::[bogs, apple, bogs]\n",
 		},
 	},
 	{
-		description: "Update empty object",
-		document:    `{}`,
-		expression:  `.a.b |= "bogs"`,
+		description:           "Update empty object",
+		dontFormatInputForDoc: true,
+		document:              `{}`,
+		expression:            `.a.b |= "bogs"`,
 		expected: []string{
 			"D0, P[], (doc)::{a: {b: bogs}}\n",
 		},
 	},
 	{
-		description: "Update empty object and array",
-		document:    `{}`,
-		expression:  `.a.b[0] |= "bogs"`,
+		description:           "Update empty object and array",
+		dontFormatInputForDoc: true,
+		document:              `{}`,
+		expression:            `.a.b.[0] |= "bogs"`,
 		expected: []string{
 			"D0, P[], (doc)::{a: {b: [bogs]}}\n",
 		},
@@ -105,7 +114,7 @@ var assignOperatorScenarios = []expressionScenario{
 	{
 		skipDoc:    true,
 		document:   `{}`,
-		expression: `.a.b[1].c |= "bogs"`,
+		expression: `.a.b.[1].c |= "bogs"`,
 		expected: []string{
 			"D0, P[], (doc)::{a: {b: [null, {c: bogs}]}}\n",
 		},
@@ -116,5 +125,5 @@ func TestAssignOperatorScenarios(t *testing.T) {
 	for _, tt := range assignOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Assign Operator", assignOperatorScenarios)
+	documentScenarios(t, "Assign", assignOperatorScenarios)
 }
--- a/pkg/yqlib/operator_booleans.go
+++ b/pkg/yqlib/operator_booleans.go
@@ -3,7 +3,7 @@ package yqlib
 import (
 	"container/list"

-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )

 func isTruthy(c *CandidateNode) (bool, error) {
@@ -25,9 +25,42 @@ func isTruthy(c *CandidateNode) (bool, error) {

 type boolOp func(bool, bool) bool

+func performBoolOp(results *list.List, lhs *list.List, rhs *list.List, op boolOp) error {
+	for lhsChild := lhs.Front(); lhsChild != nil; lhsChild = lhsChild.Next() {
+		lhsCandidate := lhsChild.Value.(*CandidateNode)
+		lhsTrue, errDecoding := isTruthy(lhsCandidate)
+		if errDecoding != nil {
+			return errDecoding
+		}
+
+		for rhsChild := rhs.Front(); rhsChild != nil; rhsChild = rhsChild.Next() {
+			rhsCandidate := rhsChild.Value.(*CandidateNode)
+			rhsTrue, errDecoding := isTruthy(rhsCandidate)
+			if errDecoding != nil {
+				return errDecoding
+			}
+			boolResult := createBooleanCandidate(lhsCandidate, op(lhsTrue, rhsTrue))
+			results.PushBack(boolResult)
+		}
+	}
+	return nil
+}
+
 func booleanOp(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode, op boolOp) (*list.List, error) {
 	var results = list.New()

+	if matchingNodes.Len() == 0 {
+		lhs, err := d.GetMatchingNodes(list.New(), pathNode.Lhs)
+		if err != nil {
+			return nil, err
+		}
+		rhs, err := d.GetMatchingNodes(list.New(), pathNode.Rhs)
+		if err != nil {
+			return nil, err
+		}
+		return results, performBoolOp(results, lhs, rhs, op)
+	}
+
 	for el := matchingNodes.Front(); el != nil; el = el.Next() {
 		candidate := el.Value.(*CandidateNode)
 		lhs, err := d.GetMatchingNodes(nodeToMap(candidate), pathNode.Lhs)
@@ -39,23 +72,9 @@ func booleanOp(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTre
 			return nil, err
 		}

-		for lhsChild := lhs.Front(); lhsChild != nil; lhsChild = lhsChild.Next() {
-			lhsCandidate := lhsChild.Value.(*CandidateNode)
-			lhsTrue, errDecoding := isTruthy(lhsCandidate)
-			if errDecoding != nil {
-				return nil, errDecoding
-			}
-
-			for rhsChild := rhs.Front(); rhsChild != nil; rhsChild = rhsChild.Next() {
-				rhsCandidate := rhsChild.Value.(*CandidateNode)
-				rhsTrue, errDecoding := isTruthy(rhsCandidate)
-				if errDecoding != nil {
-					return nil, errDecoding
-				}
-				boolResult := createBooleanCandidate(lhsCandidate, op(lhsTrue, rhsTrue))
-
-				results.PushBack(boolResult)
-			}
+		err = performBoolOp(results, lhs, rhs, op)
+		if err != nil {
+			return nil, err
 		}

 	}
@@ -75,3 +94,20 @@ func AndOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathT
 		return b1 && b2
 	})
 }
+
+func NotOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("-- notOperation")
+	var results = list.New()
+
+	for el := matchMap.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		log.Debug("notOperation checking %v", candidate)
+		truthy, errDecoding := isTruthy(candidate)
+		if errDecoding != nil {
+			return nil, errDecoding
+		}
+		result := createBooleanCandidate(candidate, !truthy)
+		results.PushBack(result)
+	}
+	return results, nil
+}
--- a/pkg/yqlib/operator_booleans_test.go
+++ b/pkg/yqlib/operator_booleans_test.go
@@ -6,18 +6,36 @@ import (

 var booleanOperatorScenarios = []expressionScenario{
 	{
-		document:   `{}`,
-		expression: `true or false`,
+		description: "OR example",
+		expression:  `true or false`,
 		expected: []string{
 			"D0, P[], (!!bool)::true\n",
 		},
-	}, {
-		document:   `{}`,
+	},
+	{
+		description: "AND example",
+		expression:  `true and false`,
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		document:    "[{a: bird, b: dog}, {a: frog, b: bird}, {a: cat, b: fly}]",
+		description: "Matching nodes with select, equals and or",
+		expression:  `[.[] | select(.a == "cat" or .b == "dog")]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- {a: bird, b: dog}\n- {a: cat, b: fly}\n",
+		},
+	},
+	{
+		skipDoc:    true,
 		expression: `false or false`,
 		expected: []string{
 			"D0, P[], (!!bool)::false\n",
 		},
-	}, {
+	},
+	{
+		skipDoc:    true,
 		document:   `{a: true, b: false}`,
 		expression: `.[] or (false, true)`,
 		expected: []string{
@@ -27,10 +45,61 @@ var booleanOperatorScenarios = []expressionScenario{
 			"D0, P[b], (!!bool)::true\n",
 		},
 	},
+	{
+		description: "Not true is false",
+		expression:  `true | not`,
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		description: "Not false is true",
+		expression:  `false | not`,
+		expected: []string{
+			"D0, P[], (!!bool)::true\n",
+		},
+	},
+	{
+		description: "String values considered to be true",
+		expression:  `"cat" | not`,
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		description: "Empty string value considered to be true",
+		expression:  `"" | not`,
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		description: "Numbers are considered to be true",
+		expression:  `1 | not`,
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+		description: "Zero is considered to be true",
+		expression:  `0 | not`,
+		expected: []string{
+			"D0, P[], (!!bool)::false\n",
+		},
+	},
+	{
+
+		description: "Null is considered to be false",
+		expression:  `~ | not`,
+		expected: []string{
+			"D0, P[], (!!bool)::true\n",
+		},
+	},
 }

 func TestBooleanOperatorScenarios(t *testing.T) {
 	for _, tt := range booleanOperatorScenarios {
 		testScenario(t, &tt)
 	}
+	documentScenarios(t, "Boolean Operators", booleanOperatorScenarios)
 }
--- a/pkg/yqlib/operator_collect.go
+++ b/pkg/yqlib/operator_collect.go
@@ -3,12 +3,18 @@ package yqlib
 import (
 	"container/list"

-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )

 func CollectOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- collectOperation")

+	if matchMap.Len() == 0 {
+		node := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq", Value: "[]"}
+		candidate := &CandidateNode{Node: node}
+		return nodeToMap(candidate), nil
+	}
+
 	var results = list.New()

 	node := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
--- a/pkg/yqlib/operator_collect_object.go
+++ b/pkg/yqlib/operator_collect_object.go
@@ -2,6 +2,8 @@ package yqlib

 import (
 	"container/list"
+
+	yaml "gopkg.in/yaml.v3"
 )

 /*
@@ -19,7 +21,9 @@ func CollectObjectOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *
 	log.Debugf("-- collectObjectOperation")

 	if matchMap.Len() == 0 {
-		return list.New(), nil
+		node := &yaml.Node{Kind: yaml.MappingNode, Tag: "!!map", Value: "{}"}
+		candidate := &CandidateNode{Node: node}
+		return nodeToMap(candidate), nil
 	}
 	first := matchMap.Front().Value.(*CandidateNode)
 	var rotated []*list.List = make([]*list.List, len(first.Node.Content))
@@ -90,7 +94,7 @@ func collect(d *dataTreeNavigator, aggregate *list.List, remainingMatches *list.

 			newCandidate.Path = nil

-			newCandidate, err = multiply(d, newCandidate, splatCandidate)
+			newCandidate, err = multiply(&MultiplyPreferences{AppendArrays: false})(d, newCandidate, splatCandidate)
 			if err != nil {
 				return nil, err
 			}
--- a/pkg/yqlib/operator_collect_object_test.go
+++ b/pkg/yqlib/operator_collect_object_test.go
@@ -9,7 +9,9 @@ var collectObjectOperatorScenarios = []expressionScenario{
 		description: `Collect empty object`,
 		document:    ``,
 		expression:  `{}`,
-		expected:    []string{},
+		expected: []string{
+			"D0, P[], (!!map)::{}\n",
+		},
 	},
 	{
 		description: `Wrap (prefix) existing object`,
@@ -39,7 +41,7 @@ var collectObjectOperatorScenarios = []expressionScenario{
 	{
 		description: `Using splat to create multiple objects`,
 		document:    `{name: Mike, pets: [cat, dog]}`,
-		expression:  `{.name: .pets[]}`,
+		expression:  `{.name: .pets.[]}`,
 		expected: []string{
 			"D0, P[], (!!map)::Mike: cat\n",
 			"D0, P[], (!!map)::Mike: dog\n",
@@ -49,7 +51,7 @@ var collectObjectOperatorScenarios = []expressionScenario{
 		description:           `Working with multiple documents`,
 		dontFormatInputForDoc: false,
 		document:              "{name: Mike, pets: [cat, dog]}\n---\n{name: Rosey, pets: [monkey, sheep]}",
-		expression:            `{.name: .pets[]}`,
+		expression:            `{.name: .pets.[]}`,
 		expected: []string{
 			"D0, P[], (!!map)::Mike: cat\n",
 			"D0, P[], (!!map)::Mike: dog\n",
@@ -60,7 +62,7 @@ var collectObjectOperatorScenarios = []expressionScenario{
 	{
 		skipDoc:    true,
 		document:   `{name: Mike, pets: [cat, dog], food: [hotdog, burger]}`,
-		expression: `{.name: .pets[], "f":.food[]}`,
+		expression: `{.name: .pets.[], "f":.food.[]}`,
 		expected: []string{
 			"D0, P[], (!!map)::Mike: cat\nf: hotdog\n",
 			"D0, P[], (!!map)::Mike: cat\nf: burger\n",
--- a/pkg/yqlib/operator_collect_test.go
+++ b/pkg/yqlib/operator_collect_test.go
@@ -9,7 +9,17 @@ var collectOperatorScenarios = []expressionScenario{
 		description: "Collect empty",
 		document:    ``,
 		expression:  `[]`,
-		expected:    []string{},
+		expected: []string{
+			"D0, P[], (!!seq)::[]\n",
+		},
+	},
+	{
+		skipDoc:    true,
+		document:   ``,
+		expression: `[3]`,
+		expected: []string{
+			"D0, P[], (!!seq)::- 3\n",
+		},
 	},
 	{
 		description: "Collect single",
@@ -52,7 +62,7 @@ var collectOperatorScenarios = []expressionScenario{
 	},
 	{
 		document:   `a: {b: [1,2,3]}`,
-		expression: `[.a.b[]]`,
+		expression: `[.a.b.[]]`,
 		skipDoc:    true,
 		expected: []string{
 			"D0, P[a b], (!!seq)::- 1\n- 2\n- 3\n",
--- a/pkg/yqlib/operator_comments_test.go
+++ b/pkg/yqlib/operator_comments_test.go
@@ -75,5 +75,5 @@ func TestCommentOperatorScenarios(t *testing.T) {
 	for _, tt := range commentOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Comments Operator", commentOperatorScenarios)
+	documentScenarios(t, "Comment Operators", commentOperatorScenarios)
 }
--- a/pkg/yqlib/operator_create_map_test.go
+++ b/pkg/yqlib/operator_create_map_test.go
@@ -21,14 +21,14 @@ var createMapOperatorScenarios = []expressionScenario{
 	},
 	{
 		document:   `{name: Mike, pets: [cat, dog]}`,
-		expression: `.name: .pets[]`,
+		expression: `.name: .pets.[]`,
 		expected: []string{
 			"D0, P[], (!!seq)::- [{Mike: cat}, {Mike: dog}]\n",
 		},
 	},
 	{
 		document:   `{name: Mike, pets: [cat, dog], food: [hotdog, burger]}`,
-		expression: `.name: .pets[], "f":.food[]`,
+		expression: `.name: .pets.[], "f":.food.[]`,
 		expected: []string{
 			"D0, P[], (!!seq)::- [{Mike: cat}, {Mike: dog}]\n",
 			"D0, P[], (!!seq)::- [{f: hotdog}, {f: burger}]\n",
@@ -36,7 +36,7 @@ var createMapOperatorScenarios = []expressionScenario{
 	},
 	{
 		document:   "{name: Mike, pets: [cat, dog], food: [hotdog, burger]}\n---\n{name: Fred, pets: [mouse], food: [pizza, onion, apple]}",
-		expression: `.name: .pets[], "f":.food[]`,
+		expression: `.name: .pets.[], "f":.food.[]`,
 		expected: []string{
 			"D0, P[], (!!seq)::- [{Mike: cat}, {Mike: dog}]\n- [{Fred: mouse}]\n",
 			"D0, P[], (!!seq)::- [{f: hotdog}, {f: burger}]\n- [{f: pizza}, {f: onion}, {f: apple}]\n",
--- a/pkg/yqlib/operator_delete_test.go
+++ b/pkg/yqlib/operator_delete_test.go
@@ -43,5 +43,5 @@ func TestDeleteOperatorScenarios(t *testing.T) {
 	for _, tt := range deleteOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Delete Operator", deleteOperatorScenarios)
+	documentScenarios(t, "Delete", deleteOperatorScenarios)
 }
--- a/pkg/yqlib/operator_document_index.go
+++ b/pkg/yqlib/operator_document_index.go
--- a/pkg/yqlib/operator_document_index_test.go
+++ b/pkg/yqlib/operator_document_index_test.go
@@ -37,5 +37,5 @@ func TestDocumentIndexScenarios(t *testing.T) {
 	for _, tt := range documentIndexScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Document Index Operator", documentIndexScenarios)
+	documentScenarios(t, "Document Index", documentIndexScenarios)
 }
--- a/pkg/yqlib/operator_equals_test.go
+++ b/pkg/yqlib/operator_equals_test.go
@@ -54,5 +54,5 @@ func TestEqualOperatorScenarios(t *testing.T) {
 	for _, tt := range equalsOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Equals Operator", equalsOperatorScenarios)
+	documentScenarios(t, "Equals", equalsOperatorScenarios)
 }
--- a/pkg/yqlib/operator_explode_test.go
+++ b/pkg/yqlib/operator_explode_test.go
@@ -86,5 +86,5 @@ func TestExplodeOperatorScenarios(t *testing.T) {
 	for _, tt := range explodeTest {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Explode Operator", explodeTest)
+	documentScenarios(t, "Explode", explodeTest)
 }
--- a/pkg/yqlib/operator_file.go
+++ b/pkg/yqlib/operator_file.go
@@ -0,0 +1,38 @@
+package yqlib
+
+import (
+	"container/list"
+	"fmt"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func GetFilenameOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("GetFilename")
+
+	var results = list.New()
+
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: candidate.Filename, Tag: "!!str"}
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
+	}
+
+	return results, nil
+}
+
+func GetFileIndexOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("GetFileIndex")
+
+	var results = list.New()
+
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", candidate.FileIndex), Tag: "!!int"}
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
+	}
+
+	return results, nil
+}
--- a/pkg/yqlib/operator_file_test.go
+++ b/pkg/yqlib/operator_file_test.go
@@ -0,0 +1,31 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var fileOperatorScenarios = []expressionScenario{
+	{
+		description: "Get filename",
+		document:    `{a: cat}`,
+		expression:  `filename`,
+		expected: []string{
+			"D0, P[], (!!str)::sample.yml\n",
+		},
+	},
+	{
+		description: "Get file index",
+		document:    `{a: cat}`,
+		expression:  `fileIndex`,
+		expected: []string{
+			"D0, P[], (!!int)::0\n",
+		},
+	},
+}
+
+func TestFileOperatorsScenarios(t *testing.T) {
+	for _, tt := range fileOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "File Operators", fileOperatorScenarios)
+}
--- a/pkg/yqlib/operator_has.go
+++ b/pkg/yqlib/operator_has.go
@@ -0,0 +1,53 @@
+package yqlib
+
+import (
+	"container/list"
+	"strconv"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func HasOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+
+	log.Debugf("-- hasOperation")
+	var results = list.New()
+
+	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)
+	wanted := rhs.Front().Value.(*CandidateNode).Node
+	wantedKey := wanted.Value
+
+	if err != nil {
+		return nil, err
+	}
+
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+
+		// grab the first value
+		var contents = candidate.Node.Content
+		switch candidate.Node.Kind {
+		case yaml.MappingNode:
+			candidateHasKey := false
+			for index := 0; index < len(contents) && !candidateHasKey; index = index + 2 {
+				key := contents[index]
+				if key.Value == wantedKey {
+					candidateHasKey = true
+				}
+			}
+			results.PushBack(createBooleanCandidate(candidate, candidateHasKey))
+		case yaml.SequenceNode:
+			candidateHasKey := false
+			if wanted.Tag == "!!int" {
+				var number, errParsingInt = strconv.ParseInt(wantedKey, 10, 64) // nolint
+				if errParsingInt != nil {
+					return nil, errParsingInt
+				}
+				candidateHasKey = int64(len(contents)) > number
+			}
+			results.PushBack(createBooleanCandidate(candidate, candidateHasKey))
+		default:
+			results.PushBack(createBooleanCandidate(candidate, false))
+		}
+	}
+	return results, nil
+}
--- a/pkg/yqlib/operator_has_test.go
+++ b/pkg/yqlib/operator_has_test.go
@@ -0,0 +1,48 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var hasOperatorScenarios = []expressionScenario{
+	{
+		description: "Has map key",
+		document: `- a: "yes"
+- a: ~
+- a: 
+- b: nope
+`,
+		expression: `.[] | has("a")`,
+		expected: []string{
+			"D0, P[0], (!!bool)::true\n",
+			"D0, P[1], (!!bool)::true\n",
+			"D0, P[2], (!!bool)::true\n",
+			"D0, P[3], (!!bool)::false\n",
+		},
+	},
+	{
+		dontFormatInputForDoc: true,
+		description:           "Has array index",
+		document: `- []
+- [1]
+- [1, 2]
+- [1, null]
+- [1, 2, 3]
+`,
+		expression: `.[] | has(1)`,
+		expected: []string{
+			"D0, P[0], (!!bool)::false\n",
+			"D0, P[1], (!!bool)::false\n",
+			"D0, P[2], (!!bool)::true\n",
+			"D0, P[3], (!!bool)::true\n",
+			"D0, P[4], (!!bool)::true\n",
+		},
+	},
+}
+
+func TestHasOperatorScenarios(t *testing.T) {
+	for _, tt := range hasOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Has", hasOperatorScenarios)
+}
--- a/pkg/yqlib/operator_length.go
+++ b/pkg/yqlib/operator_length.go
@@ -0,0 +1,35 @@
+package yqlib
+
+import (
+	"container/list"
+	"fmt"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func LengthOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("-- lengthOperation")
+	var results = list.New()
+
+	for el := matchMap.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		targetNode := UnwrapDoc(candidate.Node)
+		var length int
+		switch targetNode.Kind {
+		case yaml.ScalarNode:
+			length = len(targetNode.Value)
+		case yaml.MappingNode:
+			length = len(targetNode.Content) / 2
+		case yaml.SequenceNode:
+			length = len(targetNode.Content)
+		default:
+			length = 0
+		}
+
+		node := &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", length), Tag: "!!int"}
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
+	}
+
+	return results, nil
+}
--- a/pkg/yqlib/operator_length_test.go
+++ b/pkg/yqlib/operator_length_test.go
@@ -0,0 +1,42 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var lengthOperatorScenarios = []expressionScenario{
+	{
+		description:    "String length",
+		subdescription: "returns length of string",
+		document:       `{a: cat}`,
+		expression:     `.a | length`,
+		expected: []string{
+			"D0, P[a], (!!int)::3\n",
+		},
+	},
+	{
+		description:    "Map length",
+		subdescription: "returns number of entries",
+		document:       `{a: cat, c: dog}`,
+		expression:     `length`,
+		expected: []string{
+			"D0, P[], (!!int)::2\n",
+		},
+	},
+	{
+		description:    "Array length",
+		subdescription: "returns number of elements",
+		document:       `[2,4,6,8]`,
+		expression:     `length`,
+		expected: []string{
+			"D0, P[], (!!int)::4\n",
+		},
+	},
+}
+
+func TestLengthOperatorScenarios(t *testing.T) {
+	for _, tt := range lengthOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Length", lengthOperatorScenarios)
+}
--- a/pkg/yqlib/operator_multiply.go
+++ b/pkg/yqlib/operator_multiply.go
@@ -5,7 +5,7 @@ import (

 	"container/list"

-	"gopkg.in/yaml.v3"
+	yaml "gopkg.in/yaml.v3"
 )

 type CrossFunctionCalculation func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error)
@@ -15,12 +15,14 @@ func crossFunction(d *dataTreeNavigator, matchingNodes *list.List, pathNode *Pat
 	if err != nil {
 		return nil, err
 	}
+	log.Debugf("crossFunction LHS len: %v", lhs.Len())

 	rhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Rhs)

 	if err != nil {
 		return nil, err
 	}
+	log.Debugf("crossFunction RHS len: %v", rhs.Len())

 	var results = list.New()

@@ -28,6 +30,7 @@ func crossFunction(d *dataTreeNavigator, matchingNodes *list.List, pathNode *Pat
 		lhsCandidate := el.Value.(*CandidateNode)

 		for rightEl := rhs.Front(); rightEl != nil; rightEl = rightEl.Next() {
+			log.Debugf("Applying calc")
 			rhsCandidate := rightEl.Value.(*CandidateNode)
 			resultCandidate, err := calculation(d, lhsCandidate, rhsCandidate)
 			if err != nil {
@@ -40,39 +43,49 @@ func crossFunction(d *dataTreeNavigator, matchingNodes *list.List, pathNode *Pat
 	return results, nil
 }

+type MultiplyPreferences struct {
+	AppendArrays bool
+}
+
 func MultiplyOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
 	log.Debugf("-- MultiplyOperator")
-	return crossFunction(d, matchingNodes, pathNode, multiply)
+	return crossFunction(d, matchingNodes, pathNode, multiply(pathNode.Operation.Preferences.(*MultiplyPreferences)))
 }

-func multiply(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
-	lhs.Node = UnwrapDoc(lhs.Node)
-	rhs.Node = UnwrapDoc(rhs.Node)
-	log.Debugf("Multipling LHS: %v", NodeToString(lhs))
-	log.Debugf("-          RHS: %v", NodeToString(rhs))
+func multiply(preferences *MultiplyPreferences) func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+	return func(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+		lhs.Node = UnwrapDoc(lhs.Node)
+		rhs.Node = UnwrapDoc(rhs.Node)
+		log.Debugf("Multipling LHS: %v", lhs.Node.Tag)
+		log.Debugf("-          RHS: %v", rhs.Node.Tag)

-	if lhs.Node.Kind == yaml.MappingNode && rhs.Node.Kind == yaml.MappingNode ||
-		(lhs.Node.Kind == yaml.SequenceNode && rhs.Node.Kind == yaml.SequenceNode) {
+		shouldAppendArrays := preferences.AppendArrays
+
+		if lhs.Node.Kind == yaml.MappingNode && rhs.Node.Kind == yaml.MappingNode ||
+			(lhs.Node.Kind == yaml.SequenceNode && rhs.Node.Kind == yaml.SequenceNode) {
+
+			var newBlank = &CandidateNode{
+				Path:     lhs.Path,
+				Document: lhs.Document,
+				Filename: lhs.Filename,
+				Node:     &yaml.Node{},
+			}
+			var newThing, err = mergeObjects(d, newBlank, lhs, false)
+			if err != nil {
+				return nil, err
+			}
+			return mergeObjects(d, newThing, rhs, shouldAppendArrays)

-		var newBlank = &CandidateNode{
-			Path:     lhs.Path,
-			Document: lhs.Document,
-			Filename: lhs.Filename,
-			Node:     &yaml.Node{},
 		}
-		var newThing, err = mergeObjects(d, newBlank, lhs)
-		if err != nil {
-			return nil, err
-		}
-		return mergeObjects(d, newThing, rhs)
-
+		return nil, fmt.Errorf("Cannot multiply %v with %v", lhs.Node.Tag, rhs.Node.Tag)
 	}
-	return nil, fmt.Errorf("Cannot multiply %v with %v", NodeToString(lhs), NodeToString(rhs))
 }

-func mergeObjects(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode) (*CandidateNode, error) {
+func mergeObjects(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode, shouldAppendArrays bool) (*CandidateNode, error) {
 	var results = list.New()
-	err := recursiveDecent(d, results, nodeToMap(rhs))
+
+	// shouldn't recurse arrays if appending
+	err := recursiveDecent(d, results, nodeToMap(rhs), !shouldAppendArrays)
 	if err != nil {
 		return nil, err
 	}
@@ -83,7 +96,7 @@ func mergeObjects(d *dataTreeNavigator, lhs *CandidateNode, rhs *CandidateNode)
 	}

 	for el := results.Front(); el != nil; el = el.Next() {
-		err := applyAssignment(d, pathIndexToStartFrom, lhs, el.Value.(*CandidateNode))
+		err := applyAssignment(d, pathIndexToStartFrom, lhs, el.Value.(*CandidateNode), shouldAppendArrays)
 		if err != nil {
 			return nil, err
 		}
@@ -98,13 +111,14 @@ func createTraversalTree(path []interface{}) *PathTreeNode {
 		return &PathTreeNode{Operation: &Operation{OperationType: TraversePath, Value: path[0], StringValue: fmt.Sprintf("%v", path[0])}}
 	}
 	return &PathTreeNode{
-		Operation: &Operation{OperationType: Pipe},
+		Operation: &Operation{OperationType: ShortPipe},
 		Lhs:       createTraversalTree(path[0:1]),
 		Rhs:       createTraversalTree(path[1:])}

 }

-func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *CandidateNode, rhs *CandidateNode) error {
+func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *CandidateNode, rhs *CandidateNode, shouldAppendArrays bool) error {
+
 	log.Debugf("merge - applyAssignment lhs %v, rhs: %v", NodeToString(lhs), NodeToString(rhs))

 	lhsPath := rhs.Path[pathIndexToStartFrom:]
@@ -113,6 +127,8 @@ func applyAssignment(d *dataTreeNavigator, pathIndexToStartFrom int, lhs *Candid
 	if rhs.Node.Kind == yaml.ScalarNode || rhs.Node.Kind == yaml.AliasNode {
 		assignmentOp.OperationType = Assign
 		assignmentOp.Preferences = &AssignOpPreferences{false}
+	} else if shouldAppendArrays && rhs.Node.Kind == yaml.SequenceNode {
+		assignmentOp.OperationType = AddAssign
 	}
 	rhsOp := &Operation{OperationType: ValueOp, CandidateNode: rhs}

--- a/pkg/yqlib/operator_multiply_test.go
+++ b/pkg/yqlib/operator_multiply_test.go
@@ -13,6 +13,13 @@ var multiplyOperatorScenarios = []expressionScenario{
 			"D0, P[], (!!map)::{a: {also: me}, b: {also: me}}\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		expression: `{} * {"cat":"dog"}`,
+		expected: []string{
+			"D0, P[], (!!map)::cat: dog\n",
+		},
+	},
 	{
 		skipDoc:    true,
 		document:   `{a: {also: me}, b: {also: [1]}}`,
@@ -92,6 +99,22 @@ b:
 			"D0, P[], (!!map)::{a: [3, 4, 5], b: [3, 4, 5]}\n",
 		},
 	},
+	{
+		skipDoc:    true,
+		document:   `{a: [1], b: [2]}`,
+		expression: `.a *+ .b`,
+		expected: []string{
+			"D0, P[a], (!!seq)::[1, 2]\n",
+		},
+	},
+	{
+		description: "Merge, appending arrays",
+		document:    `{a: {array: [1, 2, animal: dog], value: coconut}, b: {array: [3, 4, animal: cat], value: banana}}`,
+		expression:  `.a *+ .b`,
+		expected: []string{
+			"D0, P[a], (!!map)::{array: [1, 2, {animal: dog}, 3, 4, {animal: cat}], value: banana}\n",
+		},
+	},
 	{
 		description: "Merge to prefix an element",
 		document:    `{a: cat, b: dog}`,
@@ -130,5 +153,5 @@ func TestMultiplyOperatorScenarios(t *testing.T) {
 	for _, tt := range multiplyOperatorScenarios {
 		testScenario(t, &tt)
 	}
-	documentScenarios(t, "Multiply Operator", multiplyOperatorScenarios)
+	documentScenarios(t, "Multiply", multiplyOperatorScenarios)
 }
--- a/pkg/yqlib/operator_not.go
+++ b/pkg/yqlib/operator_not.go
@@ -1,20 +0,0 @@
-package yqlib
-
-import "container/list"
-
-func NotOperator(d *dataTreeNavigator, matchMap *list.List, pathNode *PathTreeNode) (*list.List, error) {
-	log.Debugf("-- notOperation")
-	var results = list.New()
-
-	for el := matchMap.Front(); el != nil; el = el.Next() {
-		candidate := el.Value.(*CandidateNode)
-		log.Debug("notOperation checking %v", candidate)
-		truthy, errDecoding := isTruthy(candidate)
-		if errDecoding != nil {
-			return nil, errDecoding
-		}
-		result := createBooleanCandidate(candidate, !truthy)
-		results.PushBack(result)
-	}
-	return results, nil
-}
--- a/pkg/yqlib/operator_not_test.go
+++ b/pkg/yqlib/operator_not_test.go
@@ -1,65 +0,0 @@
-package yqlib
-
-import (
-	"testing"
-)
-
-var notOperatorScenarios = []expressionScenario{
-	{
-		description: "Not true is false",
-		expression:  `true | not`,
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		description: "Not false is true",
-		expression:  `false | not`,
-		expected: []string{
-			"D0, P[], (!!bool)::true\n",
-		},
-	},
-	{
-		description: "String values considered to be true",
-		expression:  `"cat" | not`,
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		description: "Empty string value considered to be true",
-		expression:  `"" | not`,
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		description: "Numbers are considered to be true",
-		expression:  `1 | not`,
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-		description: "Zero is considered to be true",
-		expression:  `0 | not`,
-		expected: []string{
-			"D0, P[], (!!bool)::false\n",
-		},
-	},
-	{
-
-		description: "Null is considered to be false",
-		expression:  `~ | not`,
-		expected: []string{
-			"D0, P[], (!!bool)::true\n",
-		},
-	},
-}
-
-func TestNotOperatorScenarios(t *testing.T) {
-	for _, tt := range notOperatorScenarios {
-		testScenario(t, &tt)
-	}
-	documentScenarios(t, "Not Operator", notOperatorScenarios)
-}
--- a/pkg/yqlib/operator_path.go
+++ b/pkg/yqlib/operator_path.go
@@ -0,0 +1,39 @@
+package yqlib
+
+import (
+	"container/list"
+	"fmt"
+
+	yaml "gopkg.in/yaml.v3"
+)
+
+func createPathNodeFor(pathElement interface{}) *yaml.Node {
+	switch pathElement := pathElement.(type) {
+	case string:
+		return &yaml.Node{Kind: yaml.ScalarNode, Value: pathElement, Tag: "!!str"}
+	default:
+		return &yaml.Node{Kind: yaml.ScalarNode, Value: fmt.Sprintf("%v", pathElement), Tag: "!!int"}
+	}
+}
+
+func GetPathOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	log.Debugf("GetPath")
+
+	var results = list.New()
+
+	for el := matchingNodes.Front(); el != nil; el = el.Next() {
+		candidate := el.Value.(*CandidateNode)
+		node := &yaml.Node{Kind: yaml.SequenceNode, Tag: "!!seq"}
+
+		content := make([]*yaml.Node, len(candidate.Path))
+		for pathIndex := 0; pathIndex < len(candidate.Path); pathIndex++ {
+			path := candidate.Path[pathIndex]
+			content[pathIndex] = createPathNodeFor(path)
+		}
+		node.Content = content
+		lengthCand := &CandidateNode{Node: node, Document: candidate.Document, Path: candidate.Path}
+		results.PushBack(lengthCand)
+	}
+
+	return results, nil
+}
--- a/pkg/yqlib/operator_path_test.go
+++ b/pkg/yqlib/operator_path_test.go
@@ -0,0 +1,61 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var pathOperatorScenarios = []expressionScenario{
+	{
+		description: "Map path",
+		document:    `{a: {b: cat}}`,
+		expression:  `.a.b | path`,
+		expected: []string{
+			"D0, P[a b], (!!seq)::- a\n- b\n",
+		},
+	},
+	{
+		description: "Get map key",
+		document:    `{a: {b: cat}}`,
+		expression:  `.a.b | path | .[-1]`,
+		expected: []string{
+			"D0, P[a b -1], (!!str)::b\n",
+		},
+	},
+	{
+		description: "Array path",
+		document:    `{a: [cat, dog]}`,
+		expression:  `.a.[] | select(. == "dog") | path`,
+		expected: []string{
+			"D0, P[a 1], (!!seq)::- a\n- 1\n",
+		},
+	},
+	{
+		description: "Get array index",
+		document:    `{a: [cat, dog]}`,
+		expression:  `.a.[] | select(. == "dog") | path | .[-1]`,
+		expected: []string{
+			"D0, P[a 1 -1], (!!int)::1\n",
+		},
+	},
+	{
+		description: "Print path and value",
+		document:    `{a: [cat, dog, frog]}`,
+		expression:  `.a.[] | select(. == "*og") | [{"path":path, "value":.}]`,
+		expected: []string{`D0, P[], (!!seq)::- path:
+    - a
+    - 1
+  value: dog
+- path:
+    - a
+    - 2
+  value: frog
+`},
+	},
+}
+
+func TestPathOperatorsScenarios(t *testing.T) {
+	for _, tt := range pathOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Path", pathOperatorScenarios)
+}
--- a/pkg/yqlib/operator_pipe.go
+++ b/pkg/yqlib/operator_pipe.go
@@ -0,0 +1,11 @@
+package yqlib
+
+import "container/list"
+
+func PipeOperator(d *dataTreeNavigator, matchingNodes *list.List, pathNode *PathTreeNode) (*list.List, error) {
+	lhs, err := d.GetMatchingNodes(matchingNodes, pathNode.Lhs)
+	if err != nil {
+		return nil, err
+	}
+	return d.GetMatchingNodes(lhs, pathNode.Rhs)
+}
--- a/pkg/yqlib/operator_pipe_test.go
+++ b/pkg/yqlib/operator_pipe_test.go
@@ -0,0 +1,31 @@
+package yqlib
+
+import (
+	"testing"
+)
+
+var pipeOperatorScenarios = []expressionScenario{
+	{
+		description: "Simple Pipe",
+		document:    `{a: {b: cat}}`,
+		expression:  `.a | .b`,
+		expected: []string{
+			"D0, P[a b], (!!str)::cat\n",
+		},
+	},
+	{
+		description: "Multiple updates",
+		document:    `{a: cow, b: sheep, c: same}`,
+		expression:  `.a = "cat" | .b = "dog"`,
+		expected: []string{
+			"D0, P[], (doc)::{a: cat, b: dog, c: same}\n",
+		},
+	},
+}
+
+func TestPipeOperatorScenarios(t *testing.T) {
+	for _, tt := range pipeOperatorScenarios {
+		testScenario(t, &tt)
+	}
+	documentScenarios(t, "Pipe", pipeOperatorScenarios)
+}
--- a/Show More
+++ b/Show More
Author	SHA1	Message	Date
Mike Farah	12edcafd8c	Bumping version to beta2	2020-12-09 12:16:16 +11:00
Mike Farah	db60746e4e	Can now properly handle .a[] expressions	2020-12-09 12:15:14 +11:00
Mike Farah	a3e422ff76	added another test	2020-12-01 18:10:10 +11:00
Mike Farah	2c3357702d	clarified pipe parsing tests	2020-12-01 18:08:41 +11:00
Mike Farah	c9dbf04da3	Added pipe and length docs, fix pipe precedence	2020-12-01 17:58:07 +11:00
Mike Farah	da027f69d7	updated cobra package	2020-12-01 16:16:20 +11:00
Mike Farah	8cd290c00b	incrementing version	2020-12-01 15:15:12 +11:00
Mike Farah	363fe5d283	Added sort keys operator	2020-12-01 15:06:54 +11:00
Mike Farah	773b1a3517	fixed create doc for eval-all	2020-12-01 14:23:27 +11:00
Mike Farah	cf4915d786	improved acceptance tests	2020-12-01 14:14:16 +11:00
Mike Farah	08f579f4e3	Fixed create yaml	2020-12-01 14:06:49 +11:00
Mike Farah	c9229439f7	added exit status	2020-11-30 16:35:21 +11:00
Mike Farah	9bc66c80b6	Added write-inlplace flag	2020-11-30 16:05:07 +11:00
Mike Farah	8de10e550d	wip - write in place	2020-11-29 20:25:47 +11:00
Mike Farah	1258fa199e	Updated lib todo list	2020-11-28 11:25:10 +11:00
Mike Farah	3a030651a3	Added append equals, merge append. Fixed creating numeric arrays	2020-11-28 11:24:16 +11:00
Mike Farah	3f48201a19	wip	2020-11-28 10:46:04 +11:00
Mike Farah	3cecb4e383	wip	2020-11-28 10:41:09 +11:00
Mike Farah	13679e51e2	Added get key examples	2020-11-26 11:20:53 +11:00
Mike Farah	5205f01248	Fixed recursive decent on empty objects/arrays	2020-11-25 15:01:12 +11:00
Mike Farah	0a66bb797d	4 alpha2	2020-11-25 13:32:32 +11:00
Mike Farah	1ce30b25dc	Add operator!	2020-11-24 13:07:19 +11:00
Mike Farah	3d6a231722	Added has operator	2020-11-24 11:38:39 +11:00
Mike Farah	3f04a1b52e	Fixed empty array op	2020-11-22 13:50:32 +11:00
Mike Farah	aed598c736	Fixing docs	2020-11-22 13:16:54 +11:00
Mike Farah	e9fa873af8	path operator singular	2020-11-22 12:22:15 +11:00
Mike Farah	064cff1341	added path operator!	2020-11-22 12:19:57 +11:00
Mike Farah	fc3af441e5	Extracted out evaluators	2020-11-22 11:56:28 +11:00
Mike Farah	e451119014	Added File operators	2020-11-20 23:08:12 +11:00
Mike Farah	d38caf6bc2	Added File operators	2020-11-20 22:57:32 +11:00
Mike Farah	4e385a1b93	get file wip	2020-11-20 15:50:15 +11:00
Mike Farah	356aac5a1f	fixed boolean example	2020-11-20 15:33:21 +11:00
Mike Farah	663413cd7a	Fixed typo	2020-11-20 15:31:49 +11:00
Mike Farah	f03005f86d	Fixed boolean ops	2020-11-20 15:29:53 +11:00
Mike Farah	bc87aca8d7	wip	2020-11-20 14:35:34 +11:00
Mike Farah	c08980e70f	Set entrypoint to yq	2020-11-20 13:53:44 +11:00
Mike Farah	9674acf684	Fixed docker file, fixed doco	2020-11-19 22:53:05 +11:00
				`@@ -0,0 +1 @@`
				The `or` and `and` operators take two parameters and return a boolean result. `not` flips a boolean from true to false, or vice versa. These are most commonly used with the `select` operator to filter particular nodes.
				`@@ -0,0 +1 @@`
				Use the `documentIndex` operator to select nodes of a particular document.
				`@@ -0,0 +1 @@`
				`This is operation that returns true if the key exists in a map (or index in an array), false otherwise.`
				`@@ -0,0 +1 @@`
				`Returns the lengths of the nodes. Length is defined according to the type of the node.`
				`@@ -1 +0,0 @@`
				This is a boolean operator and will return `true` when given a `false` value (including null), and `false` otherwise.
				`@@ -0,0 +1 @@`
				`Pipe the results of an expression into another. Like the bash operator.`
				`@@ -1 +0,0 @@`
				The tag operator can be used to get or set the tag of ndoes (e.g. `!!str`, `!!int`, `!!bool`).
				`@@ -1 +0,0 @@`
				`This is the simples (and perhaps most used) operator, it is used to navigate deeply into yaml structurse.`
				`@@ -0,0 +1 @@`
				`This is the simplest (and perhaps most used) operator, it is used to navigate deeply into yaml structurse.`