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jq ignore missing attribute

echo '[{"a": 1, "b": 2}, {"b": 3}]' | jq '.[] | select(.a) | .a'

Output:

and no empty lines as desired.

Bibliography:

stackoverflow.com/questions/42097410/how-to-check-for-presence-of-key-in-jq-before-iterating-over-the-values

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