yq/pkg/yqlib/doc/operators/group-by.md

Group By

This is used to group items in an array by an expression.

Group by field

Given a sample.yml file of:

[{foo: 1, bar: 10}, {foo: 3, bar: 100}, {foo: 1, bar: 1}]

then

yq 'group_by(.foo)' sample.yml

will output

- - {foo: 1, bar: 10}
  - {foo: 1, bar: 1}
- - {foo: 3, bar: 100}

Group by field, with nuls

Given a sample.yml file of:

[{cat: dog}, {foo: 1, bar: 10}, {foo: 3, bar: 100}, {no: foo for you}, {foo: 1, bar: 1}]

then

yq 'group_by(.foo)' sample.yml

will output

- - {cat: dog}
  - {no: foo for you}
- - {foo: 1, bar: 10}
  - {foo: 1, bar: 1}
- - {foo: 3, bar: 100}