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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.

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