at command

at command executes or edit commands scheduled for a later time


Syntax : 

at [-f filename] [-m] -t time [date] [-l] [-r]

Examples :

at 5pm Tuesday -f commands.txt


In this example the at command will run a job as specified in a commands.txt file on following Tuesday at 5pm 

at -l = This command will list each of the scheduled jobs as seen below.

1072250520.a Wed Dec 24 00:22:00 2003

at -r 1072250520.a = Deletes the job just created.

Options :

-f         Specify the pathname of a file to be used as the source of the at-job, instead of standard input.

 -l        (The letter ell.) Report all jobs scheduled for the invoking user if no at_job_id operands are specified. If  at_job_ids  are  specified, report only information for these jobs. The output shall be written to standard output.

 -m     Send  mail  to  the invoking user after the at-job has run, announcing its completion. Standard output and standard error produced by the

              at-job shall be mailed to the user as well, unless redirected elsewhere. Mail shall be sent even if the job produces no output.

-r          Delete the job  that you have set in the past.

-date  Specifies in what date you wish to run the command job. We can use date in the  format month, date, year. The following formats can also be used.

today - Indicates the current day.
tomorrow - Indicates  the day following the current day.

-t       Specifies at what time you want run the command. hh:mm. am / pm time format or 24-hour time format can be used.

The following time formats can also be used

midnight - Indicates the time 12:00 am (00:00).
noon - Indicates the time 12:00 pm.
now - Indicates the current day and time. Now submit an at-job for immediate execution.