Scheduling of system event
UNIX provides the ability to schedule scripts and commands for execution at a later point in time. The exact time at that the command should be run can be specified. UNIX OS also gives a way of reporting on the scheduled jobs and removing them if the user does not need to execute them.
Scheduling Events
Scheduling of repetitive execution of system events can be complete using the crontab command. One system event can be scheduled at a specified time through using the at command.