Linux Configuration Task Scheduler-—— crontab

First, the Task plan management--crontab

Edit Scheduled Task: Crontab-e "-u user Name"

View Scheduled Tasks: Crontab-l "-u user Name"

Delete Scheduled Task: Crontab-r "-u user Name"

Root user can manage scheduled tasks for a specified user

Ordinary users can only manage their own scheduled tasks

II. configuration format of the task plan

*　　 *　　 *　　 *　　 *

Minute hour date Month week

Minutes: The value is any integer from 0~59

Hours: The value is any integer from 0~23

Date: The value is any integer from 1~31

Month: The value is any integer from 1~12

Week: The value is any integer from 0~7, 0 or 7 for Sunday

Command: The command or program script to execute

Three, the special expression method of time value

* Indicates any time within the range

, which represents multiple discontinuous points of time for the interval

-Represents a continuous range of time

/Specify the time frequency of the interval

Application examples

0 17 * * 1-5 weeks to Friday daily 17:00

30 8 * * 1,3,5 per week, three or five 8:30

0 8-18/2 * * * 8 to 18 points every 2 hours

0 * */3 * * every 3 days

Linux Configuration Task Scheduler-—— crontab