A simple example of running a timed task under CentOS crontab

First, open the command line. If crontab is not installed,

1, first install crontab:

Yum Install Crontabs

Description

/sbin/service crond Start//boot service
/sbin/service Crond Stop//Off service
/sbin/service crond Restart//Restart service
/sbin/service Crond Reload//Reload Configuration
/sbin/service crond Status//view current Crond run status

2, log on to the Linux system with ordinary users. Run Crond to make sure Crond is currently running

/sbin/service crond Start//boot service

3, into the crontab VI compiler

Crontab–e

Description: The system Default editor is vim, if not please add the following shell:

Editor=vi
Export EDITOR

Basic format:

* * * * command
Time-sharing and Lunar Week command

4, open the VI compiler, enter the content

*/1 * * * Date >> $HOME/test1.txt

Save and exit, esc+shift+;

5, here, in your Desktop home folder will be one more folder

If it doesn't work, reboot.

Su Root
Cd/etc/init.d
./crond Restart

Open the home file on your desktop, and there will be a test.txt file, and you'll be able to read it every minute.

Crontab Rule Detail Instance

1, 6:00 Daily implementation

0 6 * * * root/home/www.111cn.net/osyunwei.sh

2, every Saturday 4:00 implementation

0 4 * * 6 root/home/www.111cn.net/osyunwei.sh

3, every Saturday 4:05 implementation

5 4 * * 6 root/home/www.111cn.net/osyunwei.sh

4, every Saturday 4:15 implementation

4 * * 6 root/home/www.111cn.net/osyunwei.sh

5, every Saturday 4:25 implementation

4 * * 6 root/home/www.111cn.net/osyunwei.sh

6, every Saturday 4:35 implementation

4 * * 6 root/home/www.111cn.net/osyunwei.sh

7, every Saturday 5:00 implementation

5 * * 6 root/home/www.111cn.net/osyunwei.sh

8, 8:40 Daily implementation

8 * * * root/home/www.111cn.net/osyunwei.sh

9, 8:30 Daily implementation

8 * * * root/home/www.111cn.net/osyunwei.sh

10, every Monday to Friday starting 11:41, every 10 minutes to perform a

41,51 * * 1-5 root/home/www.111cn.net/osyunwei.sh

1-59/10 12-23 * * 1-5 root/home/www.111cn.net/osyunwei.sh

11, at the beginning of the 10:31 every day, repeat every 2 hours

10-23/2 * * * root/home/www.111cn.net/osyunwei.sh

12, 15:00 Daily implementation

0 * * * * root/home/www.111cn.net/osyunwei.sh

13. Start 10:30 every day, repeat every 2 hours.

10-23/2 * * * root/home/www.111cn.net/osyunwei.sh

14, 15:30 Daily implementation

* * * root/home/www.111cn.net/osyunwei.sh

15, 17:50 Daily implementation

* * * * root/home/www.111cn.net/osyunwei.sh

16, 8:00 Daily implementation

0 8 * * * root/home/www.111cn.net/osyunwei.sh

17, 18:00 Daily implementation

0 * * * * root/home/www.111cn.net/osyunwei.sh

18, 8:30 Daily implementation

System Yun-wei Www.111cn.net warm reminder: qihang01 original content copyright, reproduced please indicate the source and the original link

8 * * * root/home/www.111cn.net/osyunwei.sh

19, 20:30 every day

* * * * root/home/www.111cn.net/osyunwei.sh

20, every Monday to Friday 2:00

0 2 * * 1-5 root/home/www.111cn.net/osyunwei.sh

21, every Monday to Friday 9:30

9 * * 1-5 root/home/www.111cn.net/osyunwei.sh

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

0 8,9 * * 1-5 root/home/www.111cn.net/osyunwei.sh

23, 23:59 every day

* * * root/home/www.111cn.net/osyunwei.sh

24, every Saturday 23:59

* * 6 root/home/www.111cn.net/osyunwei.sh

25, 0:30 every day

0 * * * root/home/www.111cn.net/osyunwei.sh

26, every Monday to Friday between 9:25 to 11:35, between 13:00 to 15:00, run every 10 minutes

25,35,45,55 9 * * 1-5 root/home/www.111cn.net/osyunwei.sh

5-59/10 * * 1-5 root/home/www.111cn.net/osyunwei.sh

5,15,25,35 * * 1-5 root/home/www.111cn.net/osyunwei.sh

*/10 13-15 * * 1-5 root/home/www.111cn.net/osyunwei.sh

27, 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, the implementation of a

30,50 8 * * 1-5 root/home/www.111cn.net/osyunwei.sh

9 * * 1-5 root/home/www.111cn.net/osyunwei.sh

*/30 10-11 * * 1-5 root/home/www.111cn.net/osyunwei.sh

* * 1-5 root/home/www.111cn.net/osyunwei.sh

0,30 14-15 * * 1-5 root/home/www.111cn.net/osyunwei.sh

28, 23:50 Daily implementation

* * * * root/home/www.111cn.net/osyunwei.sh

29, every day 10:00, 16:00 execution

0 10,16 * * * root/home/www.111cn.net/osyunwei.sh

30, 5:30 Daily implementation

5 * * * root/home/www.111cn.net/osyunwei.sh

31, every Monday to Friday 9:30 implementation

9 * * 1-5 root/home/www.111cn.net/osyunwei.sh

32, every Monday to Friday 13:00 implementation

0 * * 1-5 root/home/www.111cn.net/osyunwei.sh

33, 7:51 Daily implementation

Wuyi 7 * * * root/home/www.111cn.net/osyunwei.sh

34, every day 7:53, 12:40, respectively, the implementation of one

7 * * * root/home/www.111cn.net/osyunwei.sh

* * * root/home/www.111cn.net/osyunwei.sh

35, 7:55 Daily implementation

7 * * * root/home/www.111cn.net/osyunwei.sh

36, every day 8:10, 16:00, 20:00, respectively, the implementation of one

8 * * * root/home/www.111cn.net/osyunwei.sh

0 * * * root/home/www.111cn.net/osyunwei.sh

0 * * * * root/home/www.111cn.net/osyunwei.sh

37, every day 7:57, 8:00, respectively, the implementation of one

7 * * * root/home/www.111cn.net/osyunwei.sh

0 8 * * * root/home/www.111cn.net/osyunwei.sh