This subchapter looks at at, a UNIX (and Linux) command.
at is used to schedule a particular job at a particular time.
Teach Yourself UNIX/Linux System Administration and Shell Programming
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This subchapter looks at at, a UNIX (and Linux) command.
at is used to schedule a particular job at a particular time.
Type at midnight, followed by ENTER or RETURN.
$ at midnight
You may see the at> prompt (on Mac OS X, there is no prompt).
Type a single command, followed by ENTER or RETURN.
$ who> who.out
Type one command per line.
When finished, hold down the CONTROL key and then the D key (written ^d) to exit at.
job 1 at Fri Jul 13 00:00:00 2012
$
You will see a job number and the time it will run. This job will run all of the commands you entered.
Type atrm (for at remove), followed by the job number to remove an existing at job.
$ atrm 1
You can name a specific time using the YYMMDDhhmm.SS format.
You can also specify noon, midnight, or teatime (4 p.m.).
If the time has already passed, the next day is assumed.
Coding example: I am making heavily documented and explained open source code for a method to play music for free — almost any song, no subscription fees, no download costs, no advertisements, all completely legal. This is done by building a front-end to YouTube (which checks the copyright permissions for you).
View music player in action: www.musicinpublic.com/.
Create your own copy from the original source code/ (presented for learning programming).
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free downloadable college text book
free downloadable system administrator and shell programming book
Because I no longer have the computer and software to make PDFs, the book is available as an HTML file, which you can convert into a PDF.
Teach Yourself UNIX/Linux System Administration and Shell Programming
Building a free downloadable text book on computer programming for university, college, community college, and high school classes in computer programming.
If you like the idea of this project,
then please donate some money.
send donations to:
Milo
PO Box 1361
Tustin, California 92781
Supporting the entire project:
If you have a business or organization that can support the entire cost of this project, please contact Pr Ntr Kmt (my church)
Some or all of the material on this web page appears in the
free downloadable college text book on computer programming.
This web site handcrafted on Macintosh computers using Tom Bender’s Tex-Edit Plus and served using FreeBSD .
†UNIX used as a generic term unless specifically used as a trademark (such as in the phrase “UNIX certified”). UNIX is a registered trademark in the United States and other countries, licensed exclusively through X/Open Company Ltd.
Names and logos of various OSs are trademarks of their respective owners.
Copyright © 2012 Milo
Created: June 22, 2012
Last Updated: June 22, 2012
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