How Linux creates Scheduled tasks

How can you do ops? Create a scheduled task!

1.at: Used to create a temporary task, the command no longer takes effect after the task is completed

The most common is the shutdown or restart of the server.

[[Email protected] Desktop]# at 19:00

At>/sbin/shutdown-h now<EOT> It's best to enter the absolute path of the command

If you do not know the absolute path of the command can be viewed by which+ space + command

Job 4 at 2017-02-27 19:00

PS: The red font is automatically generated after ctrl+d after the absolute path of the input command

View commands can be used ATQ or at-l

[Email protected] ~]# at-l

12017-02-27 19:00 a root

[Email protected] ~]# ATQ

12017-02-27 19:00 a root

[Email protected] ~]#

2. #crontab-E

Go to edit text

Enter in text: * * * */sbin/shutdown-h now

When you are finished editing, press: Wq Save to exit

So the server will shut down automatically at 03:30 minutes a day.

Crontab Main parameters

-L: List current Scheduled tasks

-R: Delete the current scheduled task

-E: Perform a text editor editing a scheduled task

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How Linux creates Scheduled tasks