JQ is a super powerful command line JSON
processor. One of the many things it can do is iterate over an array
and pull out the value for a specified key.
Real world example:
curl http://api.citybik.es/citi-bike-nyc.json | jq '[.[] | .name]'
The above is the same as using map as specified in the
docs
curl http://api.citybik.es/citi-bike-nyc.json | jq 'map(.name)'