Linux crontab Commands

Install Crontab:

Yum Install Crontabs

Basic cron Service Control commands:

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1. /sbin/service crond Start //Start service
3. /sbin/service Crond Stop //Shut down service
5. /sbin/service crond Restart //Restart service
7. /sbin/service Crond Reload //Reload configuration

View crontab Service Status: Crond status

Manually Start crontab services: Service Crond start

To see if the Crontab service is set to boot, execute command: NTSYSV

Join power on Auto start: Chkconfig--level Crond on

If you want to learn more about the Chkconfig--level command, http://www.cnblogs.com/panjun-Donet/archive/2010/08/10/1796873.html explain it in more detail.

Crontab Command Introduction

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1. Feature Description: Set the timer.
5. Syntax: crontab [-u <用户名称> ] [configuration file] or crontab [-u <用户名称> ][-ELR]
9. Additional note: Cron is a resident service that provides the function of a timer that allows the user to execute a preset instruction or program at a specific time. The function of the timer can be used as long as the user edits the timer's configuration file. Its configuration file format is as follows:
11. Minute Hour Day Month DayOFWeek Command
15. Parameters
17. -e Edit the user's timer settings.
19. -l lists the user's timer settings.
21. -R removes the user's timer settings.
23. <用户名称> -u Specifies the name of the user to set the timer.

crontab format

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2. Basic format:
6. * * * * * command
10. Time-sharing Weekly command
18. The 1th column represents minutes 1~59 per minute with * or */1
22. The 2nd column represents the hour 1~23 (0 means 0 points)
26. The 3rd column represents the date 1~31
30. The 4th column represents the month 1~12
34. 5th Column Identification Number Week 0~6 (0 = Sunday)
38. 6th List of commands to run
46. # Use the hash sign to prefix a comment
50. # + —————-minute (0–59)
54. # | + ————-Hour (0–23)
58. # | | + ———-Day of month (1–31)
62. # | | | + ——-Month (1–12)
66. # | | | | +--Day of Week (0–7) (sunday=0 or 7)
70. # | | | | |
74. # * * * * * command to be executed

Some examples of crontab files:

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2. - * * * * /etc/init.d/nginx Restart
6. Every night : re-start Nginx.
14. $ 4 1,ten, * */etc/ Init.d/nginx Restart
18. 4 : 45 per month, 1,ten, Day Restart nginx.
26. Ten 1 * * 6,0 /etc/init.d/nginx restart
30. Every Saturday, Sunday of 1 : restart nginx.
38. 0 , - * * * * * /etc/init.d/nginx Restart
42. Per Day : from xx to : every Restart nginx in five minutes.
50. 0 * * 6 /etc/init.d/nginx Restart
54. Every Saturday : pm to restart Nginx.
62. * * * *1 * * */etc/init.d/nginx restart
66. Restart Nginx every hour
74. * 7/1 * * */etc/init.d/nginx restart
78. In the evening , between 7 o ' Day, restart Nginx every hour .
86. 0 4 * mon-wed/etc/init.d/nginx restart
90. 4 monthly and every Monday to Wednesday, restart nginx .
98. 0 4 1 Jan */etc/init.d/nginx Restart
102. 4- Point Restart of nginx on January 1
110. * * * * * * * * /usr/sbin/ntpdate 210.72. 145.20
116. Synchronize time every half hour

Apply to Thinkphp

First you have to write the function code that you want to execute on a regular basis into the action. Or you can do it after you access it with a URL.

For example, I put the update code for the regular daily traversal of the order to see if the turnover is order/update_status.

My Project Access address is www.jieqinwang.com that is: The code execution path for this feature is: Http://www.jieqinwang.com/Order/update_status

After you get this path, you can go to Liunx to configure Cron.

Crontab-e into the task list.

Press the I key to enter edit mode, and then add a task.

For example, I want to execute the code I just wrote every day 12 o'clock noon.

Just add a new line 0 * * * * Curl Http://www.jieqinwang.com/Order/update_status

Then press the ESC key to exit edit mode and enter: Wq enter. Save exit.

This allows us to add a timed task. You can use Crontab-l to see if the task list is already contained.

The last step, as such additions may not take effect immediately. We can restart the cron service.

Restart Service command: / sbin / service crond restart

Original link: http://164418960.iteye.com/blog/2170536

The above describes the Linux crontab command, including the aspects of the content, I hope that the PHP tutorial interested in a friend helpful.

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