CentOS uses crontab to perform scheduled tasks

Walker's requirement is to execute a shell script at 1 o'clock every day, following the basic features that Walker uses.

1. Installation

Yum Install Crontabs

2. Service-related

/sbin/service crond status #查看任务状态/sbin/service crond start #启动服务/sbin/service crond stop #关闭服务/sbin/ Service Crond Restart #重启服务/sbin/service crond Reload #重新载入配置

3 . View Scheduled Tasks. Basic command line parameters are recommended to use crontab--help , mancrontab too cumbersome.

Crontab-l #查看当前用户计划任务crontab-U userx-l #查看userx用户的计划任务

4 . View the task execution log.

Tail-f/var/log/cron

5,/etc/crontab file inside the system planning tasks,/var/spool/cron/directory inside according to the user to store scheduled tasks.

6. Edit the/etc/crontab Configuration Schedule task.

Shell=/bin/bashpath=/sbin:/bin:/usr/sbin:/usr/binmailto=roothome=/# for details see man  4 crontabs# example of job definition:#&nbsp.---------------- minute   (0 - 59) # |  .------------- hour  (0 - 23) # |   | &NBSP:---------- day of month  (1 - 31) # |  |   | &NBSP:------- month  (1 - 12)  or jan,feb,mar,apr ...# |   |  |  | &NBSP---- day of week  (0 - 6)   (sunday=0 or 7)  or sun,mon,tue,wed,thu,fri,sat# |  |  |   |  |# *  *  *  *  * [user-name]  command to be executed  0  1  *  *  *   root /home/walker/test.sh 

The content format of the scheduled task file in the/var/spool/cron/directory is identical to the above. The difference is that/var/spool/cron/must specify the user;/etc/crontab is a system scheduled task that can be specified without a user.

Walker * * *

This article is from "Walker's Journal" blog, please be sure to keep this source http://walkerqt.blog.51cto.com/1310630/1690113

CentOS uses crontab to perform scheduled tasks