Merge two YAML files

Deep-merge two YAML documents

yq eval-all 'select(fileIndex==0) * select(fileIndex==1)' base.yaml override.yaml

More yq commands

Convert YAML to JSON

yq -o=json '.' config.yaml

Output YAML document as JSON
Convert JSON to YAML

cat config.json | yq -P '.'

Pretty-print JSON as YAML
Filter array items by condition

yq '.items[] | select(.status.phase == "Running")' pods.yaml

Select only Running pods from a list
Update image tag across manifests

yq -i '(.spec.template.spec.containers[] | select(.name == "app") | .image) = "myapp:v2.0.0"' deployment.yaml

Targeted image update for a named container
Process multiple files at once

yq '.metadata.name' manifests/*.yaml

Extract metadata.name from all YAML files in a directory