Command Reference Guide
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STANDARD Printed by: Nora Chuang [nchuang] STANDARD
/build/1111/BRICK/man1/!!!intro.1
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a
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 suffix, 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 first operator is accepted and the trail-
ing operator is silently ignored.
If you use both -t and time ... in the same command, the first specified is accepted and the second is
silently ignored.
If the FIFO used to communicate with cron fills up,
at is suspended until cron has read sufficient mes-
sages 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 file 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 availablesecond.
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 configured, 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
defined, the job runs in the user default group (PRMID=1). See prmconfig(1) for a description of how to
configure 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
/usr/bin/sh POSIX shell
/var/adm/cron Main cron directory
/var/adm/cron/.proto
This file contains a set of shell commands which are added to the at
job file 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:
prmconfig(1), prmconf(4) in HP Process Resource Manager User’s Guide.
HP-UX Release 11i: December 2000 − 5 − Section 1−−31
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