PG 9.6.24 (Yes, it's EOL.)
When running "vacuumdb -p5433 -j4 --analyze tap_d" from a bash prompt, it works as expected:
$ vacuumdb -p5433 -j4 --analyze tap_d
vacuumdb: vacuuming database "tap_d"
But not when running from crontab:
vacuumdb -p5433 -j4 --analyze tap_d
vacuumdb: invalid option -- 'j'
Try "vacuumdb --help" for more information.
Obviously I'm missing something, but don't see what it is. Attached is the script it runs from.