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Quick links About
at
Syntax
Examples
Related commands
Linux / Unix main page
About at
Schedules a command to be ran at
a particular time, such as a print job late at night.
Syntax
| at |
executes commands at a specified time. |
| atq |
lists the user's pending jobs, unless the user is the superuser; in that case, everybody's jobs are
listed. The format of the output lines (one for each job) is: Job number, date, hour, job class. |
| atrm |
deletes jobs, identified by their job number. |
| batch |
executes commands when system load levels permit; in other words, when the load average drops below
1.5, or the value specified in the invocation of atrun. |
at [-c | -k | -s] [-f filename]
[-q queuename] [-m] -t time [date]
[-l] [-r]
| -c |
C shell. csh(1) is used to execute the at-job. |
| -k |
Korn shell. ksh(1) is used to execute the at-job. |
| -s |
Bourne shell. sh(1) is used to execute the at-job. |
| -f filename |
Specifies the file that contains the command to run. |
| -m |
Sends mail once the command has been run. |
| -t time |
Specifies at what time you want the command to be ran. Format hh:mm.
am / pm indication can also follow the time otherwise a 24-hour
clock is used. A timezone name of GMT, UCT or ZULU (case
insensitive) can follow to specify that the time is in
Coordinated Universal Time. Other timezones can be specified
using the TZ environment variable. The below quick times can
also be entered:
midnight - Indicates the time 12:00 am (00:00).
noon - Indicates the time 12:00 pm.
now - Indicates the current day and time. Invoking at - now will
submit submit an at-job for potentially immediate execution. |
| date |
Specifies the date you wish it to be ran on. Format month, date, year.
The following quick days can also be entered:
today - Indicates the current day.
tomorrow - Indicates the day following the current day. |
| -l |
Lists the commands that have been set to run. |
| -r |
Cancels the command that you have set in the past. |
Examples
at -m 01:35 < atjob = Run the commands
listed in the 'atjob' file at 1:35AM, in addition all output that
is generated from job mail to the user running the task. When this
command has been successfully enter you should receive a prompt
similar to the below example.
commands will be executed using /bin/csh
job 1072250520.a at Wed Dec 24 00:22:00 2003
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.
or
atrm 23 = Deletes job 23. If you wish to create a job that is
repeated you could modify the file that executes the commands with
another command that recreates the job or better yet use the crontab
command.
Note: Performing just the at
command at the prompt will give you an error "Garbled
Time", this is a standard error message if no switch or
time setting is given.
Related commands
crontab |
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