Sorry didn't see all the attention here, @tony-sol you can do it like this:

yq '.[] |= pick(["name", "status"])' data1.yaml

Explanation:

• You want to pick particular fields from each map in the array
• .[] |= will match each element in the array, and update that element w.r.t itself
• pick([]) will take a given map and pick fields (omitting the rest)

See https://mikefarah.gitbook.io/yq/operators/pick for details.

The different with doing .[] | (.name, .status) is that will match all elements and just pulling out just those values.

You can use jq '.[] | .login, .id' to obtain each login followed by its id.

There's no need to use with_entries (which provides .key) as you can directly access the key using key. Add .image to descend into each (selected) image, and assign your new value(s).

.services[] |= select(key == "app_sandbox*").image = "some-image:latest"

Updating (|=) with an assignment (=) filter, however, may be hard to read (or to know of the individual precedences involved). It might be more convenient to wrap (at least the traversal part of) the LHS in parens, and use the assignment on that:

(.services[] | select(key == "app_sandbox*")).image = "some-image:latest"

Just need brackets:

cat test.yml | yq '.[] | (.name + " | `@" + (.slack.username | downcase) + "`")'

The trick is to convert the object into an array, apply the selection to the array elements and then convert it back into an object. The filter with_entries does these conversions under the hood. It is a shorthand for to_entries | map(foo) | from_entries (see jq manual).

The call is slightly different depending on the yq implementation used: yq - Python or yq - Go. The bash script contains calls for both implementations.

#!/bin/bash

INPUT='
{
  "entries": {
    "entry1": {
      "enabled": true
    },
    "entry2": {
      "enabled": false
    },
    "entry3": {
      "dummy": "TEST"
    }
  }
}
'

echo "yq - Go implementation"       # https://mikefarah.gitbook.io/yq/
yq -j e '.entries | with_entries(select(.value.enabled == true))' - <<< "$INPUT"

echo "yq - Python implementation"   # https://github.com/kislyuk/yq
yq '.entries | with_entries(select(.value.enabled == true))' <<< "$INPUT"

output

{
  "entry1": {
    "enabled": true
  }
}

Not really sure how you want to output the results, but you can use pick to pick particular fields.

e.g:

yq '.. | select(has("title") or has("description") or has("summary")) | pick(["title", "summary", "description"])' openapi.yaml