AT

NAME
     at, batch, atq, atrm -- queue, examine, or delete jobs for later execution
     
SYOPSIS
     at [-q queue] [-f file] [-m] time

     atq [-q queue] [-v]

     atrm job [job ...]

     batch [-f file] [-m] time

NOTE
     at, batch, atq, atrm are all disabled by default on Mac OS X.  Each of
     these commands depend on the execution of atrun(8) which has been disabled
     due to power management concerns.  Those who would like to use
     these commands, must first (as root) re-enable atrun by running:

     launchctl load -w /System/Library/LaunchDaemons/com.apple.atrun.plist

DESCRIPTION
     The at and batch utilities read commands from the standard input or a
     specified file which are to be executed at a later time, using sh(1).

     The functions of the commands are as follows:

     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.

     atrm    Deletes jobs.

     batch   Executes commands when system load levels drop below a userspecifed
             threshold.  The load threshold for batch jobs is
             specifed as an argument when executing atrun(8).

     For both at and batch, the working directory, environment (except for the
     variables TERM, TERMCAP, DISPLAY, and _) 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 at is
     executed from a su(1) shell, the owner of the login shell will receive
     the mail.

OPTIONS
     The available options are as follows:

     -q queue
             Use the specified queue.  A queue designation consists of a single
             letter; valid queue designation range from a to l.  The a
             queue is the default, and b is the batch queue.  Queues with
             higher letters run with increased niceness.  If atq is given a
             specific queue, it will only show jobs pending in that queue.

     -m      Send mail to the user when the job has completed, even if there
             was no output.

     -f file
             Reads the job from file rather than the standard input.

     -v      Shows completed but not yet deleted jobs in the queue.

TIME SPECIFICATION
     at, AT&T UNIX allows some moderately complex time specifications.  It
     accepts times of the form HHMM or 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 midnight, noon, or teatime (4PM) and you can give a time
     of day suffixed with AM or 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 month-name day with an optional year, or giving a date
     of the form MMDDYY, MM/DD/YY or DD.MM.YY.  You can also give times like
     now + count time-units, where the time units can be minutes, hours, days,
     or weeks You can suffix the time with today to run the job today, or
     tomorrow to run the job tomorrow.

     For example, to run a job at 4PM three days from now, you would specify a
     time of 4PM + 3 days.  To run a job at 10:00AM on on July 31, you would
     specify a time of 10AM Jul 31.  Finally, to run a job at 1AM tomorrow,
     you would specify a time of 1AM tomorrow.

FILES
     /var/at/jobs      Directory containing job files
     /var/at/spool     Directory containing output spool files
     /var/at/lockfile  Job-creation lock file.
     /var/run/utmp

SEE ALSO
     launchctl(1), launchd(8), nice(1), sh(1), compat(5), atrun(8)

AUTHOR
     Thomas Koenig, ig25@rz.uni-karlsruhe.de

BUGS
     Traditional access control to at and batch via the files /var/at/at.allow
     and /var/at/at.deny is not implemented.

     If the file /var/run/utmp is not available or corrupted, or if the user
     is not logged in at the time at is invoked, the mail is sent to the
     userid found in the environment variable LOGNAME.  If that is undefined
     or empty, the current userid is assumed.

NetBSD 0.9A                    December 5, 1993                    NetBSD 0.9A