yq/pkg/yqlib/doc/operators/with.md

With

Use the with operator to conveniently make multiple updates to a deeply nested path, or to update array elements relatively to each other. The first argument expression sets the root context, and the second expression runs against that root context.

{% hint style="warning" %} Note that versions prior to 4.18 require the 'eval/e' command to be specified.

yq e <exp> <file> {% endhint %}

Update and style

Given a sample.yml file of:

a:
  deeply:
    nested: value

then

yq 'with(.a.deeply.nested; . = "newValue" | . style="single")' sample.yml

will output

a:
  deeply:
    nested: 'newValue'

Update multiple deeply nested properties

Given a sample.yml file of:

a:
  deeply:
    nested: value
    other: thing

then

yq 'with(.a.deeply; .nested = "newValue" | .other= "newThing")' sample.yml

will output

a:
  deeply:
    nested: newValue
    other: newThing

Update array elements relatively

The second expression runs with each element of the array as it's contextual root. This allows you to make updates relative to the element.

Given a sample.yml file of:

myArray:
  - a: apple
  - a: banana

then

yq 'with(.myArray[]; .b = .a + " yum")' sample.yml

will output

myArray:
  - a: apple
    b: apple yum
  - a: banana
    b: banana yum