Commands for Scheduling System Events

You can schedule system events to execute repetitively, at regular intervals, by using the crontab command.You can schedule a single system event for execution at a specified time by using the at command. The following table summarizes crontab and at, as well as the files that enable you to control access to these commands.

Table 30-1 Command Summary: Scheduling System Events

Command	What It Schedules	Location of Files	Files That Control Access
crontab	Multiple system events at regular intervals	/var/spool/cron/crontabs	/etc/cron.d/cron.allow and /etc/cron.d/cron.deny
at	A single system event	/var/spool/cron/atjobs	/etc/cron.d/at.deny