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