Examples of crontab timed tasks in Linux

Grammar

Format: * * * * * * * * * * * * * * * * The task of the Year

For example, the following example performs a task every minute:

*/1 * * * */usr/bin/php/users/huangyibiao/desktop/shell/test.php >>/users/huangyibiao/desktop/shell/test.log

Common commands

To view the list of tasks in the current crontab file:

Crontab-l

If you want to suspend the task, simply comment out the task!

Go to the Crontab task List to edit:

Crontab-e

E is the meaning of edit!

Example

Execute */5 * * * * every five minutes

0 per hour * * * * * *

Daily Execution 0 0 * * *

Perform 0 0 * * 0 per week

0 0 1 * * * per month

Annual Implementation 0 0 1 1 *

Example

The above example shows the 21:30 restart Apache per night

* * * */usr/local/apache/bin/apachectlrestart

The above example represents the 4:45 restart Apache for 1, 10, and 22nd per month

4 1,10,22 * */usr/local/apache/bin/apachectlrestart

The above example shows that every Saturday, Sunday, 1:10 restart Apache

1 * * 6,0/usr/local/apache/bin/apachectlrestart

The example above shows the restart of Apache every 30 minutes from 18:00 to 23:00 every day.

0,30 18-23 * * * */usr/local/apache/bin/apachectlrestart

The above example shows the 11:00 pm reboot Apache every Saturday

0 * * 6/usr/local/apache/bin/apachectlrestart

Restart Apache every hour

* */1 * * * */usr/local/apache/bin/apachectlrestart

From 11 o'clock to 7 in the morning, restart Apache every hour.

* 23-7/1 * * * */usr/local/apache/bin/apachectlrestart

4th per month with 11 points per Monday to Wednesday restart Apache

0-4 * mon-wed/usr/local/apache/bin/apachectlrestart

Restart Apache at 4 o ' January 1.

0 4 1 jan*/usr/local/apache/bin/apachectlrestart