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jq with bash - read multiple values and save in variable

Sometimes I need to read multiple string values from json, and save them into their own variables as a pre-processing step.

Assigning multiple variables in Bash using process substitution, i.e., <(command) and using join with an empty string saved the day.

Let the variable jsonData hold example json (from another jq TIL) using the here-doc

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# load json data
jsonData=$(cat <<EOF
  {
    "id": 1,
    "name": "James"
  }
  EOF
)

# assign vars using process substitution
read -r var1 var2 < <(echo $jsonData | jq -r '[ .id, .name] | join(" ")')
echo "id=$var1 is called $var2"

References

  • Stackoverflow: https://stackoverflow.com/a/43293515
  • Assigning multiple variables in Bash using process substitution: https://www.baeldung.com/linux/bash-multiple-variable-assignment
  • Difference between process substitution (<(command)) and here-document structure (<<): https://askubuntu.com/questions/678915/whats-the-difference-between-and-in-bash/678919#678919 and https://www.baeldung.com/linux/bash-multiple-variable-assignment and https://www.baeldung.com/linux/heredoc-herestring#here-string
This post is licensed under CC BY 4.0 by the author.

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