Create the /etc/cron.d/cron.allow file.
Enter the user names, one per line, who will be allowed to use crontab commands.
root username1 username2 username3 . . . |
Be sure to add root to this list. If you do not, superuser access to crontab commands will be denied.
The following example shows a cron.deny file that prevents user names visitor, jones, and temp from accessing crontab.
$ cat /etc/cron.d/cron.deny daemon bin smtp nuucp listen nobody noaccess jones temp visitor |
The following example shows a cron.allow file. The users smith, jones, lp, and root are the only ones who may access crontab.
$ cat /etc/cron.d/cron.allow root jones lp smith |