Using "at" jobs

Using at

            The “at” command is used to schedule a one-time task at a specific time.

            Suppose you would like your computer to rebuild your Linux kernel this evening while you're at the pub. You might proceed like this:

$ at 20.30

warning: commands will be executed using /bin/sh

at> cd /usr/src/linux

at> make all

at> <EOT>

job 2 at Wed Feb 14 19:30:00 2007

As you'll see from this, at collects the commands you want to run from its standard input, up to an EOT character (^D by default).

Your list of queued jobs can be examined using atq:

$ atq

2 Wed Feb 14 19:30:00 2007 a chris

$

Controlling access “at”

/etc/at.deny

“at” utility command

atd  –    run jobs queued for later execution 

atq  –    list queue

atrm –   delete the job 

atrun-   run jobs queued for later execution

The job run immediately 
 

[root@server1 Desktop]# at now

at> uptime >> /root/Desktop/test.txt

at>

job 4 at 2012-10-26 07:53

[root@server1 Desktop]# cat test.txt

07:54:09 up  1:24,  2 users,  load average: 0.00, 0.00, 0.00

The job run 1 minutes lately current time

[root@server1 Desktop]# at now + 1 minutes

at> uptime > /root/Desktop/test.txt

at>

job 6 at 2012-10-26 07:59

[root@server1 Desktop]# atq

6          2012-10-26 07:59 a root

[root@server1 Desktop]# cat test.txt

 07:57:00 up  1:27,  2 users,  load average: 0.00, 0.00, 0.00

You can delete a job from the queue using atrm:

$ atrm 2