Please see explanation
1. vi /var/schedule 30 17 * * * /sbin/dump -0u /dev/st0 /dev/hda7 2. crontab /var/schedule 3. service crond restart We can add the cron schedule either by specifying the scripts path on /etc/crontab file or by creating on text file on crontab pattern. cron helps to schedule on recurring events. Pattern of cron is: Minute Hour Day of Month Month Day of Week Commands - 0-59 0-23 1-31 1-12 0-7 where 0 and 7 mean Sunday. Note * means every. To execute the command on every two minutes */2.