diff --git a/README.md b/README.md
index bc0e166..702b071 100644
--- a/README.md
+++ b/README.md
@@ -46,9 +46,11 @@ import (
 func main() {
     ctx, cancel := context.WithTimeout(context.Background(), 10*time.Second)
     defer cancel()
-    userMode := false
     // Equivalent to `systemctl enable nginx` with a 10 second timeout
-    err := systemctl.Enable(ctx, "nginx", userMode)
+    opts := Options{
+        usermode: false,
+    }
+    err := Enable(ctx, unit, opts)
     if err != nil {
         log.Fatalf("unable to enable unit %s: %v", "nginx", err)
     }
diff --git a/structs.go b/structs.go
new file mode 100644
index 0000000..def6794
--- /dev/null
+++ b/structs.go
@@ -0,0 +1,5 @@
+package systemctl
+
+type Options struct {
+	usermode bool
+}
diff --git a/systemctl.go b/systemctl.go
index 3c4d0cd..b4786ef 100644
--- a/systemctl.go
+++ b/systemctl.go
@@ -2,98 +2,143 @@ package systemctl
 
 import (
 	"context"
-	"fmt"
+	"regexp"
 )
 
-// TODO
-func IsFailed(ctx context.Context, unit string, usermode bool) (bool, error) {
-
-	return false, nil
+func IsFailed(ctx context.Context, unit string, opts Options) (bool, error) {
+	var args = []string{"is-failed", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	stdout, _, _, err := execute(ctx, args)
+	if matched, _ := regexp.MatchString(`inactive`, stdout); matched {
+		return false, nil
+	} else if matched, _ := regexp.MatchString(`active`, stdout); matched {
+		return false, nil
+	} else if matched, _ := regexp.MatchString(`failed`, stdout); matched {
+		return true, nil
+	}
+	return false, err
 }
 
-// TODO
-func IsActive(ctx context.Context, unit string, usermode bool) (bool, error) {
-	return false, nil
+func IsActive(ctx context.Context, unit string, opts Options) (bool, error) {
+	var args = []string{"is-active", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	stdout, _, _, err := execute(ctx, args)
+	if matched, _ := regexp.MatchString(`inactive`, stdout); matched {
+		return false, nil
+	} else if matched, _ := regexp.MatchString(`active`, stdout); matched {
+		return true, nil
+	} else if matched, _ := regexp.MatchString(`failed`, stdout); matched {
+		return false, nil
+	}
+
+	return false, err
 }
 
-// TODO
-func Status(ctx context.Context, unit string, usermode bool) (bool, error) {
-	return false, nil
+func IsEnabled(ctx context.Context, unit string, opts Options) (bool, error) {
+	var args = []string{"is-enabled", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	stdout, _, _, err := execute(ctx, args)
+	if matched, _ := regexp.MatchString(`enabled`, stdout); matched {
+		return true, nil
+	} else if matched, _ := regexp.MatchString(`disabled`, stdout); matched {
+		return false, nil
+	}
+	return false, err
 }
 
-// TODO
-func Restart(ctx context.Context, unit string, usermode bool) error {
-	return nil
+func Status(ctx context.Context, unit string, opts Options) (string, error) {
+	var args = []string{"status", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	stdout, _, _, err := execute(ctx, args)
+	return stdout, err
 }
 
-// TODO
-func Start(ctx context.Context, unit string, usermode bool) error {
-	return nil
+func Restart(ctx context.Context, unit string, opts Options) error {
+	var args = []string{"restart", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	_, _, _, err := execute(ctx, args)
+	return err
 }
 
-// TODO
-func Stop(ctx context.Context, unit string, usermode bool) error {
-	return nil
+func Start(ctx context.Context, unit string, opts Options) error {
+	var args = []string{"start", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	_, _, _, err := execute(ctx, args)
+	return err
 }
 
-func Enable(ctx context.Context, unit string, usermode bool) error {
+func Stop(ctx context.Context, unit string, opts Options) error {
+	var args = []string{"stop", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	_, _, _, err := execute(ctx, args)
+	return err
+}
+
+func Enable(ctx context.Context, unit string, opts Options) error {
 	var args = []string{"enable", "--system", unit}
-	if usermode {
+	if opts.usermode {
 		args[1] = "--user"
 	}
-	_, stderr, code, err := execute(ctx, args)
-	customErr := filterErr(stderr)
-	if customErr != nil {
-		return customErr
-	}
-	if err != nil {
-		return err
-	}
-	if code != 0 {
-		return fmt.Errorf("received error code %d for stderr `%s`: %w", code, stderr, ErrUnspecified)
-	}
-	return nil
+	_, _, _, err := execute(ctx, args)
+	return err
 }
 
-func Disable(ctx context.Context, unit string, usermode bool) error {
+func Disable(ctx context.Context, unit string, opts Options) error {
 	var args = []string{"disable", "--system", unit}
-	if usermode {
+	if opts.usermode {
 		args[1] = "--user"
 	}
-	_, stderr, code, err := execute(ctx, args)
-	customErr := filterErr(stderr)
-	if customErr != nil {
-		return customErr
-	}
-	if err != nil {
-		return err
-	}
-	if code != 0 {
-		return fmt.Errorf("received error code %d for stderr `%s`: %w", code, stderr, ErrUnspecified)
-	}
-	return nil
+	_, _, _, err := execute(ctx, args)
+	return err
 }
 
-// TODO
-func IsEnabled(ctx context.Context, unit string, usermode bool) (bool, error) {
-	return false, nil
-}
-
-// TODO
-func DaemonReload(ctx context.Context, unit string, usermode bool) error {
-	return nil
+func DaemonReload(ctx context.Context, opts Options) error {
+	var args = []string{"daemon-reload", "--system"}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	_, _, _, err := execute(ctx, args)
+	return err
 }
 
 //TODO
-func Show(ctx context.Context, unit string, property string, usermode bool) (string, error) {
-	return "", nil
+func Show(ctx context.Context, unit string, property string, opts Options) (string, error) {
+	var args = []string{"show", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	_, _, _, err := execute(ctx, args)
+	return "", err
 }
 
-//TODO
-func Mask(ctx context.Context, unit string, usermode bool) error {
-	return nil
+func Mask(ctx context.Context, unit string, opts Options) error {
+	var args = []string{"mask", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	_, _, _, err := execute(ctx, args)
+	return err
 }
 
-func Unmask(ctx context.Context, unit string, usermode bool) error {
-	return nil
+func Unmask(ctx context.Context, unit string, opts Options) error {
+	var args = []string{"unmask", "--system", unit}
+	if opts.usermode {
+		args[1] = "--user"
+	}
+	_, _, _, err := execute(ctx, args)
+	return err
 }
diff --git a/systemctl_test.go b/systemctl_test.go
index 2642e87..0b299ed 100644
--- a/systemctl_test.go
+++ b/systemctl_test.go
@@ -10,7 +10,10 @@ func TestEnableNonexistant(t *testing.T) {
 	unit := "nonexistant"
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
 	defer cancel()
-	err := Enable(ctx, unit, true)
+	opts := Options{
+		usermode: true,
+	}
+	err := Enable(ctx, unit, opts)
 	if err != ErrDoesNotExist {
 		t.Errorf("error is %v, but should have been %v", err, ErrDoesNotExist)
 	}
@@ -23,7 +26,10 @@ func TestEnableNoPermissions(t *testing.T) {
 	unit := "nginx"
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
 	defer cancel()
-	err := Enable(ctx, unit, false)
+	opts := Options{
+		usermode: false,
+	}
+	err := Enable(ctx, unit, opts)
 	if err != ErrInsufficientPermissions {
 		t.Errorf("error is %v, but should have been %v", err, ErrInsufficientPermissions)
 	}
@@ -37,7 +43,10 @@ func TestEnableSuccess(t *testing.T) {
 	unit := "syncthing"
 	ctx, cancel := context.WithTimeout(context.Background(), 1*time.Second)
 	defer cancel()
-	err := Enable(ctx, unit, true)
+	opts := Options{
+		usermode: true,
+	}
+	err := Enable(ctx, unit, opts)
 	if err != nil {
 		t.Errorf("error is %v, but should have been %v", err, nil)
 	}
diff --git a/util.go b/util.go
index 499490b..7a78964 100644
--- a/util.go
+++ b/util.go
@@ -3,6 +3,7 @@ package systemctl
 import (
 	"bytes"
 	"context"
+	"fmt"
 	"os/exec"
 	"regexp"
 )
@@ -37,27 +38,32 @@ func execute(ctx context.Context, args []string) (string, string, int, error) {
 	warnings = stderr.String()
 	code = cmd.ProcessState.ExitCode()
 
+	customErr := filterErr(warnings)
+	if customErr != nil {
+		err = customErr
+	}
+	if code != 0 && err == nil {
+		err = fmt.Errorf("received error code %d for stderr `%s`: %w", code, warnings, ErrUnspecified)
+	}
+
 	return output, warnings, code, err
 }
 
 func filterErr(stderr string) error {
-	matched, _ := regexp.MatchString(`does not exist`, stderr)
-	if matched {
+	if matched, _ := regexp.MatchString(`does not exist`, stderr); matched {
 		return ErrDoesNotExist
 	}
-	matched, _ = regexp.MatchString(`Interactive authentication required`, stderr)
-	if matched {
+	if matched, _ := regexp.MatchString(`No such file or directory`, stderr); matched {
+		return ErrDoesNotExist
+	}
+	if matched, _ := regexp.MatchString(`Interactive authentication required`, stderr); matched {
 		return ErrInsufficientPermissions
 	}
-	matched, _ = regexp.MatchString(`Access denied`, stderr)
-	if matched {
+	if matched, _ := regexp.MatchString(`Access denied`, stderr); matched {
 		return ErrInsufficientPermissions
 	}
-
-	matched, _ = regexp.MatchString(`Failed`, stderr)
-	if matched {
+	if matched, _ := regexp.MatchString(`Failed`, stderr); matched {
 		return ErrUnspecified
 	}
-
 	return nil
 }