Crontab Task Scheduler

Most of the management of the system is done automatically by executing a script on a regular basis. Linux's mission plan can be crotab. What to do at what time of day.

To install the command tool:
Yum Install Vixie-cron Crontabs

Crond boot from:

Chkconfig Crond on

To see if the Crond service is turned on:

Service Crond Status

To start the Crond service:
Service Crond Start

Crontab Common options:

-L: You can view the schedule of users for the specified user.
-U useranme: Specifies that the user name defaults to root.

Example: Crontab-u uaername-l//View task schedule for a specified user

-E: Edit Task Schedule, modify or Add.

-R: Delete Scheduled Tasks

To create a task schedule format:

Min Hou Day Mon Week command

Example: 1 * * */bin/sh/usr/test.sh

0 0 2 * * 0 minutes of second per month execute
0 */8 * * every eight hours.
0 1,12,18 * * * * daily 1,12,18 point execution.

Crontab Task Scheduler