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yq
v4.x
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Create, Collect into Object

This is used to construct objects (or maps). This can be used against existing yaml, or to create fresh yaml documents.

Collect empty object

Running
yq --null-input '{}'
will output
{}

Wrap (prefix) existing object

Given a sample.yml file of:
name: Mike
then
yq '{"wrap": .}' sample.yml
will output
wrap:
name: Mike

Using splat to create multiple objects

Given a sample.yml file of:
name: Mike
pets:
- cat
- dog
then
yq '{.name: .pets.[]}' sample.yml
will output
Mike: cat
Mike: dog

Working with multiple documents

Given a sample.yml file of:
name: Mike
pets:
- cat
- dog
---
name: Rosey
pets:
- monkey
- sheep
then
yq '{.name: .pets.[]}' sample.yml
will output
Mike: cat
Mike: dog
Rosey: monkey
Rosey: sheep

Creating yaml from scratch

Running
yq --null-input '{"wrap": "frog"}'
will output
wrap: frog

Creating yaml from scratch with multiple objects

Running
yq --null-input '(.a.b = "foo") | (.d.e = "bar")'
will output
a:
b: foo
d:
e: bar
Last modified 30d ago