How to run cronjob at 5 hours interval + Linux

How to run cronjob at 5 hours interval + Linux

In our day to day task, we get request of cron job scheduling so the script/service will run after certain time interval.

If we want our cronjob (eg. restarting rsyslog service) to run after every 5 hours, then we can edit crontab with below entries:

1. Edit crontab file, it will edit the crontab file of root user.

[root@cloud home]# crontab -e

2. Make below entry:

0 */5 * * *

[root@cloud home]# 0 */5 * * * systemctl restart rsyslog

Or

0 5,10,15,20 * * *

[root@cloud home]# 0 5,10,15,20 * * * systemctl restart rsyslog

3.  List crontab file:

[root@cloud home]# crontab -l

Crontab fields:

= * - first * shows minutes [0-59]

= * - second * shows hour [0-23]

= * - third * shows Day of month [1-31]

= * - Fourth * shows month [0-12]

= * - Fifth * shows day of week [0-7]

Regards,

Kiiran B Jadhav