yq/pkg/yqlib/doc/sort.md

Sort

Sorts an array. Use sort to sort an array as is, or sort_by(exp) to sort by a particular expression (e.g. subfield).

Note that at this stage, yq only sorts scalar fields.

Sort by string field

Given a sample.yml file of:

- a: banana
- a: cat
- a: apple

then

yq eval 'sort_by(.a)' sample.yml

will output

- a: apple
- a: banana
- a: cat

Sort array in place

Given a sample.yml file of:

cool:
  - a: banana
  - a: cat
  - a: apple

then

yq eval '.cool |= sort_by(.a)' sample.yml

will output

cool:
  - a: apple
  - a: banana
  - a: cat

Sort array of objects by key

Note that you can give sort_by complex expressions, not just paths

Given a sample.yml file of:

cool:
  - b: banana
  - a: banana
  - c: banana

then

yq eval '.cool |= sort_by(keys | .[0])' sample.yml

will output

cool:
  - a: banana
  - b: banana
  - c: banana

Sort is stable

Note the order of the elements in unchanged when equal in sorting.

Given a sample.yml file of:

- a: banana
  b: 1
- a: banana
  b: 2
- a: banana
  b: 3
- a: banana
  b: 4

then

yq eval 'sort_by(.a)' sample.yml

will output

- a: banana
  b: 1
- a: banana
  b: 2
- a: banana
  b: 3
- a: banana
  b: 4

Sort by numeric field

Given a sample.yml file of:

- a: 10
- a: 100
- a: 1

then

yq eval 'sort_by(.a)' sample.yml

will output

- a: 1
- a: 10
- a: 100

Sort, nulls come first

Given a sample.yml file of:

- 8
- 3
- null
- 6
- true
- false
- cat

then

yq eval 'sort' sample.yml

will output

- null
- false
- true
- 3
- 6
- 8
- cat