Linux timed Execution Shell script command crontab

Crontab can execute a shell script and execute a series of Linux commands at a specified time

Example: Server administrator regularly backs up database data, logs, etc.

Detailed

Common commands:

Crontab–e     //Modify the crontab file, if the file does not exist, it will be created automatically. Crontab–l      //display crontab file. Crontab-r      //delete crontab file. Crontab-ir     //delete crontab file before reminding the user. Service Crond Status     //view crontab Services Crond start//     Start Services service Crond stop     //Shut Down Services service Crond Restart     //Restart Services service Crond reload     //Reload Configuration

Basic format:

* * * * * command
Time of day and  month  command

The 1th column represents minutes 00~59 per minute with * or */1

The 2nd column represents the hour 00~23 (0 means 0 points)

The 3rd column represents the date 01~31

The 4th column represents the month 01~12

5th Column Identification Number Week 0~6 (0 = Sunday)

6th List of commands to run

Some examples:

1. Run at 00:10

0 * * */home/swz/aa.sh

2, the backup job every weekday 23:59.

* * 1,2,3,4,5/home/swz/aa.sh   or  1-5/home/swz/aa.sh

3. Run a command every minute

*/1 * * * */home/swz/aa.sh

4, 1th number 14:10 per month to run

1 * */home/swz/aa.sh

5, every 10 minutes to request an address regularly

0 */10 * * */usr/bin/curl http://www.aaa.com/index.php

Linux timed Execution Shell script command crontab