tldr/pages/common/yq.md

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# yq
> A lightweight and portable command-line YAML processor.
> More information: <https://mikefarah.gitbook.io/yq/>.
- 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`