command: at
usage: queue, examine or delete jobs for later execution
executes commands at a specified time.
syntax: at [-c | -k | -s] [-f filename] [-q queuename] [-mMlv] -t
time [date] [-l] [-r]
options: -c C shell is used to execute the at-job.
-m sends mail once the command has been run.
-k Korn shell.
-s Bourne shell.
-f filename specifies the file that contains the
command to run
-t time specifies at what time you want the
command to be ran.
date specifies the date you wish it to be ran on
-l lists the commands that have been set to run.
-r cancels the command that you have set in the past.
-M never send mail to the user
-v Shows the time the job will be executed before reading the job
super user can use 'at' command in any case but for normal users to
work out this
command will be determined by the files /etc/at.allow and /etc/at.deny
example:
1. $ at -m 06:00 < atjob
run the commands listed in the 'atjob' file at 06:00 a.m ,all output that
is generated from job mail to the user running the task
2. $ at 10 am apr 13
to schedule a job at 10 am on apr 13
3. To view all the scheduled jobs
$ atq
or
$ at -l
4. To remove the schedule job
$ atrm 5
or
$ at -d 5
will delete the job number with 5
5. To schedule jobs from file at 10 am apr 13
$ cat duejobs.txt
/home/mercury/sample.sh
$ at -f duejobs.txt 10 am apr 13
6. To process a command
# batch
will be prompted for 'at'
at> command
save it by ctrl -d
7. $ at 6 am tomorrow
will execute command at 6 am tomorrow
$ at now + 1 day
will execute command 1 day from now
$ at now + 2 days
will execute command 2 days later from now
regards,
dhanasekar
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