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yq

A lightweight and portable command-line YAML processor.

More information.

• Output a YAML file, in pretty-print format (v4+):

yq eval {path/to/file.yaml}

• Output a YAML file, in pretty-print format (v3):

yq read {path/to/file.yaml} --colors

• Output the first element in a YAML file that contains only an array (v4+):

yq eval '.[0]' {path/to/file.yaml}

• Output the first element in a YAML file that contains only an array (v3):

yq read {path/to/file.yaml} '[0]'

• Set (or overwrite) a key to a value in a file (v4+):

yq eval '.{key} = "{value}"' --inplace {path/to/file.yaml}

• Set (or overwrite) a key to a value in a file (v3):

yq write --inplace {path/to/file.yaml} '{key}' '{value}'

• Merge two files and print to stdout (v4+):

yq eval-all 'select(filename == "{path/to/file1.yaml}") * select(filename == "{path/to/file2.yaml}")' {path/to/file1.yaml} {path/to/file2.yaml}

• Merge two files and print to stdout (v3):

yq merge {path/to/file1.yaml} {path/to/file2.yaml} --colors

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