.\" .\" Copyright (c) 1993 Christopher G. Demetriou .\" All rights reserved. .\" .\" Redistribution and use in source and binary forms, with or without .\" modification, are permitted provided that the following conditions .\" are met: .\" 1. Redistributions of source code must retain the above copyright .\" notice, this list of conditions and the following disclaimer. .\" 2. Redistributions in binary form must reproduce the above copyright .\" notice, this list of conditions and the following disclaimer in the .\" documentation and/or other materials provided with the distribution. .\" 3. All advertising materials mentioning features or use of this software .\" must display the following acknowledgement: .\" This product includes software developed by Christopher G. Demetriou. .\" 3. The name of the author may not be used to endorse or promote products .\" derived from this software without specific prior written permission .\" .\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR .\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES .\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. .\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, .\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, .\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY .\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" .\" $Id: at.1,v 1.3 2003/06/05 17:13:32 eseidel Exp $ .\" .Dd December 5, 1993 .Dt "AT" 1 .Os NetBSD 0.9a .Sh NAME .Nm at, batch, atq, atrm .Nd queue, examine, or delete jobs for later execution .\" .Sh SYOPSIS .Nm at .Op Fl q Ar queue .Op Fl f Ar file .Op Fl m .Ar time .Pp .Nm atq .Op Fl q Ar queue .Op Fl v .Pp .Nm atrm .Ar job .Op Ar job ... .Pp .Nm batch .Op Fl f Ar file .Op Fl m .Ar time .Sh NOTE .Nm at , .Nm batch , .Nm atq , .Nm atrm are all disabled by default on Mac OS X. Each of these commands depend on the execution of .Xr atrun 8 which has been disabled due to power management concerns. Those who would like to use these commands, must first re-enable .Nm /usr/libexec/atrun by removing the leading '#' from the line .Bd -literal #*/5 * * * * root /usr/libexec/atrun .Ed in the file .Pa /etc/crontab . .Pa /etc/crontab must be edited by root. .Sh DESCRIPTION The .Nm at and .Nm batch utilities read commands from the standard input or a specified file which are to be executed at a later time, using .Xr sh 1 . .Pp The functions of the commands are as follows: .Bl -tag -width indent .It Nm at Executes commands at a specified time. .It Nm atq Lists the user's pending jobs, unless the user is the superuser. In that case, everybody's jobs are listed. .It Nm atrm Deletes jobs. .It Nm batch Executes commands when system load levels drop below a user-specifed threshold. The load threshold for batch jobs is specifed as an argument when executing .Xr atrun 8 . .El .Pp For both .Nm at and .Nm batch , the working directory, environment (except for the variables .Nm TERM , .Nm TERMCAP , .Nm DISPLAY , and .Nm _ ) and the umask are retained from the time of invocation. The user will be mailed the standard output and standard error from his commands if any output is generated. If .Nm at is executed from a .Xr su 1 shell, the owner of the login shell will receive the mail. .Sh OPTIONS .Bl -tag -width indent The available options are as follows: .It Fl q Ar queue Use the specified queue. A queue designation consists of a single letter; valid queue designation range from .Ar a to .Ar l . The .Ar a queue is the default, and .Ar b is the batch queue. Queues with higher letters run with increased niceness. If .Nm atq is given a specific queue, it will only show jobs pending in that queue. .It Fl m Send mail to the user when the job has completed, even if there was no output. .It Fl f Ar file Reads the job from .Ar file rather than the standard input. .It Fl v Shows completed but not yet deleted jobs in the queue. .El .Sh TIME SPECIFICATION .Nm At allows some moderately complex time specifications. It accepts times of the form .Ar HHMM or .Ar HH:MM to run a job at a specific time of day. If that time is already passed, the next day is assumed. You may also specify .Nm midnight , .Nm noon , or .Nm teatime (4PM) and you can give a time of day suffixed with .Nm AM or .Nm PM for running in the morning or the evening. You can also specify the date on which the job will be run by giving a date in the form .Ar month-name day with an optional .Ar year , or giving a date of the form .Ar MMDDYY , .Ar MM/DD/YY or .Ar DD.MM.YY . You can also give times like .Nm now + .Ar count time-units , where the time units can be .Nm minutes, hours, days, or .Nm weeks You can suffix the time with .Nm today to run the job today, or .Nm tomorrow to run the job tomorrow. .Pp For example, to run a job at 4PM three days from now, you would specify a time of .Nm 4PM + 3 days . To run a job at 10:00AM on on July 31, you would specify a time of .Nm 10AM Jul 31 . Finally, to run a job at 1AM tomorrow, you would specify a time of .Nm 1AM tomorrow . .Sh FILES .Bl -tag -width /var/at/lockfile -compact .It Pa /var/at/jobs Directory containing job files .It Pa /var/at/spool Directory containing output spool files .It Pa /var/at/lockfile Job-creation lock file. .It Pa /var/run/utmp .El .Sh SEE ALSO .Xr crond 8 , .Xr nice 1 , .Xr sh 1 , .Xr atrun 8 .Sh AUTHOR .Bl -tag Thomas Koenig, firstname.lastname@example.org .El .Sh BUGS Traditional access control to .Nm at and .Nm batch via the files .Pa /var/at/at.allow and .Pa /var/at/at.deny is not implemented. .Pp If the file .Pa /var/run/utmp is not available or corrupted, or if the user is not logged in at the time .Nm at is invoked, the mail is sent to the userid found in the environment variable .Nm LOGNAME . If that is undefined or empty, the current userid is assumed.