Crontab let Linux execute shell scripts at timed intervals

Use crontab you can perform a specified time in the Shell script or a series of Linux command. For example, the system administrator schedules a backup task to run every day

Entry

# crontab–e

This enables the edit mode to open the personal crontab configuration file, and then add this line:

0 0 * * */home/linrui/xxxxxxxx.sh

this will be running in the wee hours of the day of the specified . SH file

Cron Description of each item

Below are crontab format of the file:

{minute} {Hour} {Day-of-month} {Month} {Day-of-week} {Full-path-to-shell-script}

o minute: interval is 0 – -

o Hour: interval is 0 – at

o Day-of-month: interval is 0 – to

o month: interval is 1 – 1 1 month . Yes month

o Day-of-week: interval is 0 – 7. Sunday can be 0 or 7.

Crontab Example

1 , in early morning 00:01 Run

1 0 * * */home/linrui/xxxx.sh

2 , every weekday 23:59 are backed up by a backup job.

* * 1,2,3,4,5/home/linrui/xxxx.sh

or the following:

* * 1-5/home/linrui/xxxx.sh

3 , run commands every minute

*/1 * * * */home/linrui/xxxx.sh

4 , each month's 1 number 14:10 Run

1 * */home/linrui/xxxx.sh

Crontab options for Commands

Below are crontab the effective Options :

crontab – e: Modify crontab file . If the file does not exist, it is created automatically.

crontab – L: Show crontab file.

Crontab-r: Delete crontab file.

Crontab-ir: Delete crontab The user is alerted before the file.

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Crontab let Linux execute shell scripts at timed intervals