at(1)

 

 

at(1)

at 0815

Jan

24

 

at 8:15

Jan

24

 

at 9:30am tomorrow

 

at now + 1 day

 

at -f job 5

pm Friday

 

at 17:40

Tor.

# in Danish

at 17h46

demain

# in French

at 5:30

26.

Feb. 1988

# in German

at 12:00

26-02

# in Finnish

WARNINGS

If the date argument begins with a number and the time argument is also numeric without a suf®x, the time argument should be a four-digit number that can be correctly interpreted as hours and minutes.

If you use both next and +count within a single at command, the ®rst operator is accepted and the trailing operator is silently ignored.

If you use both -tand time ... in the same command, the ®rst speci®ed is accepted and the second is silently ignored.

If the FIFO used to communicate with cron ®lls up, at is suspended until cron has read suf®cient messages from the FIFO to make room for the message at is trying to write. This condition can occur if at is writing messages faster than cron can process them or if cron is not executing.

Scheduled processes are run in the background. Any script ®le that calls itself will cause the user or the system to run out of available processes.

If the execution-time request for a job duplicates the execution time of a currently scheduled job, the new job time is set to the next available second.

at will not schedule jobs whose start time precedes the current Epoch (00:00:00 January 1, 1970 UTC).

at will not schedule jobs beyond the year 2037.

DEPENDENCIES

HP Process Resource Manager

If the optional HP Process Resource Management (PRM) software is installed and con®gured, jobs are launched in the initial process resource group of the user that scheduled the job. The user's initial group is determined at the time the job is started, not when the job is scheduled. If the user's initial group is not de®ned, the job runs in the user default group (PRMID=1). See prmcon®g(1) for a description of how to con®gure HP PRM, and prmconf(4) for a description of how the user's initial process resource group is determined.

AUTHOR

at was developed by AT&T and HP.

FILES

POSIX shell

/usr/bin/sh

/var/adm/cron

Main cron directory

/var/adm/cron/.proto

This ®le contains a set of shell commands which are added to the at

 

job ®le to make the environment for the at job same as the current

 

environment. See proto(4).

/usr/lib/cron/at.allow

List of allowed users

/usr/lib/cron/at.deny

List of denied users

/var/adm/cron/queuedefs

Scheduling information

/var/spool/cron/atjobs

Spool area

SEE ALSO

crontab(1), kill(1), mail(1), nice(1), ps(1), sh(1), stty(1), cron(1M), proto(4), queuedefs(4).

HP Process Resource Manager:

prmcon®g(1), prmconf(4) in HP Process Resource Manager User's Guide.

a

HP-UX Release 11i: December 2000

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Section 1−31