Linux Scheduled Task Crontab example tutorial

Description: Crontab is a tool that executes a program at a fixed time in a Linux system, similar to a Task scheduler in a Windows system

Here's a detailed example of how to use Crontab in a Linux system

Operating System: Centos

First, install the crontab

Yum Install Vixie-cron #安装

Chkconfig Crond on #设为开机启动, first install chkconfig (yum install chkconfig)

Service Crond Start #启动

Service Crond Stop #停止

/etc/rc.d/init.d/crond Restart #重启

/etc/rc.d/init.d/crond Reload #不中断服务, re-loading configuration

Ii. set up a task plan

/home/www.osyunwei.com/osyunwei.sh #要自动执行的脚本程序路径

chmod +x/home/www.osyunwei.com/osyunwei.sh #对脚本文件添加执行权限, otherwise cannot be executed

Vi/etc/crontab #编辑配置文件, adding content on the last line

1 * * * root/home/www.osyunwei.com/osyunwei.sh #表示每天凌晨1点30执行备份

: wq! #保存退出

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/etc/rc.d/init.d/crond Restart #重启

Note:

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Crontab file Format:

Minute hour day month weekday username command

minute: Minute, value is 0-59

Hour: Hour with a value of 1-23

Day: Days with a value of 1-31

Month: The value is 1-12

Weekday: Week, value 0-6 (0 for Sunday, 1 for Monday, etc.)

Username: The user to execute the program is generally set to root

Command: Program path to execute (set to absolute path) for example:/home/www.osyunwei.com/osyunwei.sh

Attached: detailed examples of crontab rules

1, Daily 6:00 execution

0 6 * * * root/home/www.osyunwei.com/osyunwei.sh

2, every Saturday 4:00 to execute

0 4 * * 6 root/home/www.osyunwei.com/osyunwei.sh

3, every Saturday 4:05 to execute

5 4 * * 6 root/home/www.osyunwei.com/osyunwei.sh

4, every Saturday 4:15 to execute

4 * * 6 root/home/www.osyunwei.com/osyunwei.sh

5, every Saturday 4:25 to execute

4 * * 6 root/home/www.osyunwei.com/osyunwei.sh

6, every Saturday 4:35 to execute

4 * * 6 root/home/www.osyunwei.com/osyunwei.sh

7, every Saturday 5:00 to execute

5 * * 6 root/home/www.osyunwei.com/osyunwei.sh

8, Daily 8:40 execution

8 * * * root/home/www.osyunwei.com/osyunwei.sh

9, Daily 8:30 execution

8 * * * root/home/www.osyunwei.com/osyunwei.sh

10, every Monday to Friday, starting 11:41, every 10 minutes to execute

41,51 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

1-59/10 12-23 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

11. Repeat every 2 hours, starting at 10:31 every day.

10-23/2 * * * root/home/www.osyunwei.com/osyunwei.sh

12, Daily 15:00 execution

0 * * * root/home/www.osyunwei.com/osyunwei.sh

13, starting 10:30 every day, repeat every 2 hours

10-23/2 * * * root/home/www.osyunwei.com/osyunwei.sh

14, Daily 15:30 execution

* * * * root/home/www.osyunwei.com/osyunwei.sh

15, Daily 17:50 execution

* * * * root/home/www.osyunwei.com/osyunwei.sh

16, Daily 8:00 execution

0 8 * * * root/home/www.osyunwei.com/osyunwei.sh

17, Daily 18:00 execution

0 * * * root/home/www.osyunwei.com/osyunwei.sh

18, Daily 8:30 execution

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8 * * * root/home/www.osyunwei.com/osyunwei.sh

19, every day 20:30

* * * * root/home/www.osyunwei.com/osyunwei.sh

20, every Monday to Friday 2:00

0 2 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

21, every Monday to Friday 9:30

9 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

22, every Monday to Friday 8:00, every Monday to Friday 9:00

0 8,9 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

23, every day 23:59

* * * * root/home/www.osyunwei.com/osyunwei.sh

24, every Saturday 23:59

* * 6 root/home/www.osyunwei.com/osyunwei.sh

25, every day 0:30

0 * * * root/home/www.osyunwei.com/osyunwei.sh

26. Run every 10 minutes from Monday to Friday from 9:25 to 11:35, between 13:00 and 15:00

25,35,45,55 9 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

5-59/10 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

5,15,25,35 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

*/10 13-15 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

27. Execute once every Monday to Friday 8:30, 8:50, 9:30, 10:00, 10:30, 11:00, 11:30, 13:30, 14:00, 14:30, 5:00, respectively

30,50 8 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

9 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

*/30 10-11 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

* * 1-5 root/home/www.osyunwei.com/osyunwei.sh

0,30 14-15 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

28, Daily 23:50 execution

* * * * root/home/www.osyunwei.com/osyunwei.sh

29, Daily 10:00, 16:00 execution

0 10,16 * * * root/home/www.osyunwei.com/osyunwei.sh

30, Daily 5:30 execution

5 * * * root/home/www.osyunwei.com/osyunwei.sh

31, every Monday to Friday 9:30 to execute

9 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

32, every Monday to Friday 13:00 to execute

0 * * 1-5 root/home/www.osyunwei.com/osyunwei.sh

33, Daily 7:51 execution

Wuyi 7 * * * root/home/www.osyunwei.com/osyunwei.sh

34, each day 7:53, 12:40 to perform one time

7 * * * root/home/www.osyunwei.com/osyunwei.sh

* * * * root/home/www.osyunwei.com/osyunwei.sh

35, Daily 7:55 execution

7 * * * root/home/www.osyunwei.com/osyunwei.sh

36, each day 8:10, 16:00, 20:00 to perform one time

8 * * * root/home/www.osyunwei.com/osyunwei.sh

0 * * * root/home/www.osyunwei.com/osyunwei.sh

0 * * * root/home/www.osyunwei.com/osyunwei.sh

37, each day 7:57, 8:00 to perform one time

7 * * * root/home/www.osyunwei.com/osyunwei.sh

0 8 * * * root/home/www.osyunwei.com/osyunwei.sh

At this point, the Linux scheduled task crontab instance is completed in a detailed tutorial

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Linux Scheduled Task Crontab example tutorial