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Delete

yq d <yaml_file|json_file> <path_to_delete>

This command can take a json file as input too, and will output yaml unless specified to export as json (-j)

To Stdout

Given a sample.yaml file of:

b:
  c: 2
  apples: green

then

yq d sample.yaml b.c

will output:

b:
  apples: green

From STDIN

cat sample.yaml | yq d - b.c

Deleting array elements

Given a sample.yaml file of:

b:
  c: 
    - 1
    - 2
    - 3

then

yq d sample.yaml 'b.c[1]'

will output:

b:
  c:
  - 1
  - 3

Deleting nodes in-place

Given a sample.yaml file of:

b:
  c: 2
  apples: green

then

yq d -i sample.yaml b.c

will update the sample.yaml file so that the 'c' node is deleted

Keys with dots

When specifying a key that has a dot use key lookup indicator.

b:
  foo.bar: 7

yaml r sample.yaml 'b[foo.bar]'

yaml w sample.yaml 'b[foo.bar]' 9

Any valid yaml key can be specified as part of a key lookup.

Note that the path is in quotes to avoid the square brackets being interpreted by your shell.