cron

The cron service can be used to schedule file execution at specific times. Daemon can be managed via the /etc/init.d/crond interface, and cron tables managed via crontab.

Usage:

crontab [options] file

crontab [options]

crontab -n [hostname]

Options:

Options	Description
-u <user>	define user
-e	edit user's crontab
-l	list user's crontab
-r	delete user's crontab
-i	prompt before deleting
-n <host>	set host in cluster to run users' crontabs
-c	get host in cluster to run users' crontabs
-x <mask>	enable debugging

 

To perform start/stop/restart on crond service:

/etc/init.d/crond start

To verify the current crond status:

/etc/init.d/crond status

To check current cron jobs running with the following command to list all crontabs:

crontab -l

To edit or create a custom crontab file:

crontab -e

 

This opens a personal cron configuration file. Each line can contain one command to run. The following format is used:

minute hour day-of-month month day-of-week command

For example, the following entry will run a the specified backup.sh script every day at 3am:

0 3 * * * /etc/config/backup.sh

When finished, save and close the crontab file.