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yq/mkdocs/snippets/keys_with_dots.md

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Keys with dots

When specifying a key that has a dot use key lookup indicator.

b:
  foo.bar: 7
yaml r sample.yaml 'b[foo.bar]'
yaml w sample.yaml 'b[foo.bar]' 9

Any valid yaml key can be specified as part of a key lookup.

Note that the path is in quotes to avoid the square brackets being interpreted by your shell.