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AT(1)                   FreeBSD General Commands Manual                  AT(1)

NAME
     at, batch, atq, atrm -- queue, examine or delete jobs for later execution

SYNOPSIS
     at [-V] [-q queue] [-f file] [-mldbv] time
     at [-V] -c job [job ...]

     atq [-V] [-q queue] [-v]

     atrm [-V] job [job ...]

     batch [-V] [-q queue] [-f file] [-mv] [time]

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

     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 permit; in other words,
             when the load average drops below 1.5, or the value specified in
             the invocation of atrun.

     At 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 past, the next day is assumed.)  As an alternative,
     the following keywords may be specified: midnight, noon, or teatime (4pm)
     and time-of-day may be suffixed with AM or PM for running in the morning
     or the evening.  The day on which the job is to be run may also be speci-
     fied by giving a date in the form month-name day with an optional year,
     or giving a date of the forms DD.MM.YYYY, DD.MM.YY, MM/DD/YYYY, MM/DD/YY,
     MMDDYYYY, or MMDDYY.  The specification of a date must follow the speci-
     fication of the time of day.  Time can also be specified as: [now] +
     count time-units, where the time-units can be minutes, hours, days,
     weeks, months or years and you can tell at to run the job today by suf-
     fixing the time with today and to run the job tomorrow by suffixing the
     time with tomorrow.

     For example, to run a job at 4pm three days from now, you would do at 4pm
     + 3 days, to run a job at 10:00am on July 31, you would do at 10am Jul 31
     and to run a job at 1am tomorrow, you would do at 1am tomorrow.

     For both at and batch, commands are read from standard input or the file
     specified with the -f option and executed.  The working directory, the
     environment (except for the variables TERM, TERMCAP, DISPLAY and _) and
     the umask are retained from the time of invocation.  An at or batch com-
     mand invoked from a su(1) shell will retain the current userid.  The user
     will be mailed standard error and standard output from his commands, if
     any.  Mail will be sent using the command sendmail(8).  If at is executed
     from a su(1) shell, the owner of the login shell will receive the mail.

     The superuser may use these commands in any case.  For other users, per-
     mission to use at is determined by the files /var/at/at.allow and
     /var/at/at.deny.

     If the file /var/at/at.allow exists, only usernames mentioned in it are
     allowed to use at.  In these two files, a user is considered to be listed
     only if the user name has no blank or other characters before it on its
     line and a newline character immediately after the name, even at the end
     of the file.  Other lines are ignored and may be used for comments.

     If /var/at/at.allow does not exist, /var/at/at.deny is checked, every
     username not mentioned in it is then allowed to use at.

     If neither exists, only the superuser is allowed use of at.  This is the
     default configuration.

OPTIONS
     -V      Print the version number to standard error.

     -q queue
             Use the specified queue.  A queue designation consists of a sin-
             gle letter; valid queue designations range from a to z and A to
             Z.  The c queue is the default for at and the E queue for batch.
             Queues with higher letters run with increased niceness.  If a job
             is submitted to a queue designated with an uppercase letter, it
             is treated as if it had been submitted to batch at that time.  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
             Read the job from file rather than standard input.

     -l      Is an alias for atq.

     -d      Is an alias for atrm.

     -b      Is an alias for batch.

     -v      For atq, shows completed but not yet deleted jobs in the queue;
             otherwise shows the time the job will be executed.

     -c      Cat the jobs listed on the command line to standard output.

FILES
     /var/at/jobs            directory containing job files
     /var/at/spool           directory containing output spool files
     /var/run/utmp           login records
     /var/at/at.allow        allow permission control
     /var/at/at.deny         deny permission control
     /var/at/jobs/.lockfile  job-creation lock file

SEE ALSO
     nice(1), sh(1), umask(2), atrun(8), cron(8), sendmail(8)

BUGS
     If the file /var/run/utmp is not available or corrupted, or if the user
     is not logged on 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.

     At and batch as presently implemented are not suitable when users are
     competing for resources.  If this is the case for your site, you might
     want to consider another batch system, such as nqs.

AUTHORS
     At was mostly written by Thomas Koenig <ig25@rz.uni-karlsruhe.de>.  The
     time parsing routines are by
     David Parsons <orc@pell.chi.il.us>.

FreeBSD 4.10                    April 12, 1995                    FreeBSD 4.10

NAME | SYNOPSIS | DESCRIPTION | OPTIONS | FILES | SEE ALSO | BUGS | AUTHORS

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