How check crontab permissions Linux?

To verify if a specific user can access the crontab command, use the crontab -l command while you are logged into the user account. Either this user either is listed in the cron. allow file (if the file exists), or the user is not listed in the cron.

How do I allow a user to run crontab?

Add the root user name to the cron. allow file. If you do not add root to the file, superuser access to crontab commands will be denied. Add the user names, one user name per line.