Keys
Use the keys operator to return map keys or array indices.
Map keys
Given a sample.yml file of:
dog: woof
cat: meow
then
yq eval 'keys' sample.yml
will output
- dog
- cat
Array keys
Given a sample.yml file of:
- apple
- banana
then
yq eval 'keys' sample.yml
will output
- 0
- 1