I have a script being run automatically that I can't find in the crontab for the expected users, so I'd like to search all users' crontabs for it.
Essentially I want to run a
crontab -l for all users.
Well depends on the script but easily you can find your crontab as root with
crontab -l -u <user>
Or you can find crontab from spool where is located file for all users
To show all users' crontabs with the username printed at the beginning of each line.
cd /var/spool/cron/crontabs/ && grep . *