What is AT command?

What is AT command?

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The AT command is used to set a specific command or batch file to execute at a certain time.

Syntax:

AT [option] schedule time

Several options are used with the AT command. Following is a list of some important options:

Option	Description
-q	Uses the specified queue.
-m	Sends a mail to a user when a job is completed.
-f file	Reads a job from a file.
-l	Shows the time a job will be executed.

The ATD daemon monitors the queue of the AT commands and executes them at a specified time.

Example:

The following command will create a list of jobs to be executed at 8:00 AM on 22nd August 2004.

AT 08:00 22.08.2004<enter>
at> LS<enter>
at> PWD<enter>
<ctrl> + <d>

The <ctrl> + <d> key combination is used to end the list of commands.

The jobs can be removed from an AT queue by using the ATRM command.

Note: AT is not able to schedule recurring jobs.

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