Jq index() Not Found

user_8779890 0
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Executing the following jq command works fine on Mac OS Catalina (jq version 1.6) :

echo $(jq '.paths | to_entries | map(select(.value[].tags | index("Tag123"))) | from_entries' custom.json)

However executing it on CentOS (CentOS release 6.9 (Final)) (jq version 1.3) returns the following error :

echo $(jq '.paths | to_entries | map(select(.value[].tags | index("Shell"))) | from_entries' custom.json)
error: index is not defined
.paths | to_entries | map(select(.value[].tags | index("Shell"))) | from_entries
                                                 ^^^^^
1 compile error
jq python
2 Answers

Evidently the version of jq installed via pip was version 1.3 (which is ancient history) or earlier. index/1 was only introduced as a built-in filter after the release of jq 1.3.

If you are absolutely stuck with jq 1.3, you could use contains/1 if you don't need the integer index.

user_9973580

Note that pip install jq does not install the executable that you can use interactively from the command line, but as a python package, which you can use only in scripts.

As for the disparity in the usage of index() function, you seem to be using an older/outdated version of jq-1.3 in CentOS which does not have the index(), rindex() functions.

From the changelog

New features in 1.4 since 1.3:

  • string built-ins:
  • index, rindex, indices

Your version on MacOS jq-1.6 has those functions available.

user_52910150
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