Adding multiple lines to yaml file based on key

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I have sample.yaml file that looks like the following:

 a:
  b:
    - "x"
    - "y"
    - "z"

and I have another file called toadd.yaml that contains the following

- "first to add"
- "second to add"

I want to modify sample.yaml file so that it looks like:

 a:
  b:
    - "x
    - "y"
    - "z"
    - "first to add"
    - "second to add"

Also, I dont want redundant naming! so if there is "x" already in toadd.yaml than I dont want it to be added two times in sample.yaml/a.b

Please note that I have tried the following:

while read line; do
    yq '.a.b += ['$line']' sample.yaml
done <toadd.yaml

and I fell on:

Error: Bad expression, could not find matching `]`
yq kubernetes yaml
1 Answers

If the files are relatively smaller, you could just directly load the second file on to the first. See Merging two files together

yq '.a.b += load("toadd.yaml")' sample.yaml

Tested on mikefarah/yq version 4.25.1

To solve the redundancy requirement, do a unique operation before forming the array again.

yq 'load("toadd.yaml") as $data | .a.b |= ( . + $data | unique )' sample.yaml

which can be further simplified to just

yq '.a.b |= ( . + load("toadd.yaml") | unique )' sample.yaml
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