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Plain \dconfig is basically equivalent to SHOW except that you can give it a pattern with wildcards, either to match multiple GUCs or because you don't exactly remember the name you want. \dconfig+ adds type, context, and access-privilege information, mainly because every other kind of object privilege has a psql command to show it, so GUC privileges should too. (A form of this command was in some versions of the patch series leading up to commit a0ffa885e. We pulled it out then because of doubts that the design and code were up to snuff, but I think subsequent work has resolved that.) In passing, fix incorrect completion of GUC names in GRANT/REVOKE ON PARAMETER: a0ffa885e neglected to use the VERBATIM form of COMPLETE_WITH_QUERY, so it misbehaved for custom (qualified) GUC names. Mark Dilger and Tom Lane Discussion: https://postgr.es/m/3118455.1649267333@sss.pgh.pa.us