Evaluate strings like jq instead of files

[marcellodesales]

jq uses input stream to evaluate strings

• With any Json, I can quickly parse/evaluate the string value...

echo '{"name": "Marcello"}' | \
        docker run --rm -i imega/jq '.name == "Marcello"'
true

yq requires a file path to evaluate

• My current solution with yq requires a file to evaluate values:

echo 'name: Marcello'  > a.yaml  | \
       docker run --rm -i -v $(pwd):$(pwd) mikefarah/yq eval '.name == "Marcello"' $(pwd)/a.yaml
true

Question: How can I evaluate yaml strings instead of files?

• How can I evaluate strings similar to jq???
  • As I understand, jq uses an input stream instead of the file path

[mikefarah]

You can pass in - as a filename to read from STDIN.

[marcellodesales]

@mikefarah Thank you! I found the reference and I didn't reload the page :) I posted a comment with the answer too :D

[marcellodesales]

Answer

• Oops... Just found the answer at https://mikefarah.gitbook.io/yq/v/v4.x/commands/evaluate#usage
  • Use - as the file name for STDIN

$ echo 'name: Marcello' | docker run --rm -i -v $(pwd):$(pwd) mikefarah/yq eval '.name == "Marcello"' -
true