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42 lines
1.2 KiB
Plaintext
42 lines
1.2 KiB
Plaintext
---
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syntax: markdown
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tags: [tldr, common]
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source: https://github.com/tldr-pages/tldr.git
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---
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# yq
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> A lightweight and portable YAML processor.
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> More information: <https://mikefarah.gitbook.io/yq/>.
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- Output a YAML file, in pretty-print format (v4+):
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`yq eval {{path/to/file.yaml}}`
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- Output a YAML file, in pretty-print format (v3):
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`yq read {{path/to/file.yaml}} {{[-C|--colors]}}`
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- Output the first element in a YAML file that contains only an array (v4+):
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`yq eval '.[0]' {{path/to/file.yaml}}`
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- Output the first element in a YAML file that contains only an array (v3):
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`yq read {{path/to/file.yaml}} '[0]'`
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- Set (or overwrite) a key to a value in a file (v4+):
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`yq eval '.{{key}} = "{{value}}"' {{[-i|--inplace]}} {{path/to/file.yaml}}`
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- Set (or overwrite) a key to a value in a file (v3):
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`yq write {{[-i|--inplace]}} {{path/to/file.yaml}} '{{key}}' '{{value}}'`
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- Merge two files and print to `stdout` (v4+):
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`yq eval-all 'select(filename == "{{path/to/file1.yaml}}") * select(filename == "{{path/to/file2.yaml}}")' {{path/to/file1.yaml}} {{path/to/file2.yaml}}`
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- Merge two files and print to `stdout` (v3):
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`yq merge {{path/to/file1.yaml}} {{path/to/file2.yaml}} {{[-C|--colors]}}`
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