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About
at
Syntax
Examples
Related
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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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