dokucama

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JQ stands for 'json query'

• Objects (dictionaries)
• Arrays (lists)
• strings

jq . # the dots means 'applies for all objects below'

aws ec2 describe-regions  | jq -r "[[.Regions[].RegionName]]"
aws ec2 describe-vpcs | jq -r "[[.Reservations[].Instances[].InstanceId]]"  # extract all instances id (down 3 levels)
aws ec2 describe-vpcs | jq -r '.Vpcs | length'   # COUNT number of VPCs
aws ec2 describe-vpcs --region eu-west-1 | jq -r '.Vpcs | length'    # For a DIFFERENT Region

For containers/docker:

docker inspect --format '{{ json .State.Status }}' 47878c
docker inspect 47878c | jq .

oci compute instance list --compartment-id=$cb | jq -r '.data[]|select (."display-name"=="pepe37.lhr.oci.grapeshot.co.uk")'
oci compute instance list --compartment-id=$cb | jq -r '.data[]|select (."display-name" | contains("cc0"))'  # like regex 'contains'

This filters with id but extracts the pair, not the key https://til.hashrocket.com/posts/uv0bjiokwk-use-jq-to-filter-objects-list-with-regex