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OpenDarwin 7.2.1 - man page for batch (opendarwin section 1)

AT(1)				   BSD General Commands Manual				    AT(1)

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

     at [-q queue] [-f file] [-mldbv] time
     at [-q queue] [-f file] [-mldbv] -t [[CC]YY]MMDDhhmm[.SS]
     at -c job [job ...]
     at -l [job ...]
     at -l -q queue
     at -r job [job ...]

     atq [-q queue] [-v]

     atrm job [job ...]

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

     The at and batch utilities 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 _LOADAVG_MX, or the value specified in the invocation of atrun.

     The at utility 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 specified
     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 specification 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 at may be told to run the job today by suffixing 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, use at 4pm + 3 days, to run a job at
     10:00am on July 31, use at 10am Jul 31 and to run a job at 1am tomorrow, use at 1am

     The at utility also supports the POSIX time format (see -t option).

     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 command 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, permission to use at is
     determined by the files _PERM_PATH/at.allow and _PERM_PATH/at.deny.

     If the file _PERM_PATH/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 com-

     If _PERM_PATH/at.allow does not exist, _PERM_PATH/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 configura-

     Note that at is implemented through the cron(8) daemon by calling atrun(8) every five min-
     utes.  This implies that the granularity of at might not be optimal for every deployment.
     If a finer granularity is needed, the system crontab at /etc/crontab needs to be changed.

     -q queue
	     Use the specified queue.  A queue designation consists of a single letter; valid
	     queue designations range from a to z and A to Z.  The _DEFAULT_AT_QUEUE queue is the
	     default for at and the _DEFAULT_BATCH_QUEUE 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

     -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      With no arguments, list all jobs for the invoking user.  If one or more job numbers
	     are given, list only those jobs.

     -d      Is an alias for atrm (this option is deprecated; use -r instead).

     -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.

     -r      Remove the specified jobs.

     -t      Specify the job time using the POSIX time format.	The argument should be in the
	     form [[CC]YY]MMDDhhmm[.SS] where each pair of letters represents the following:

		   CC	   The first two digits of the year (the century).
		   YY	   The second two digits of the year.
		   MM	   The month of the year, from 1 to 12.
		   DD	   the day of the month, from 1 to 31.
		   hh	   The hour of the day, from 0 to 23.
		   mm	   The minute of the hour, from 0 to 59.
		   SS	   The second of the minute, from 0 to 61.

	     If the CC and YY letter pairs are not specified, the values default to the current
	     year.  If the SS letter pair is not specified, the value defaults to 0.

     _ATJOB_DIR 	   directory containing job files
     _ATSPOOL_DIR	   directory containing output spool files
     /var/run/utmp	   login records
     _PERM_PATH/at.allow   allow permission control
     _PERM_PATH/at.deny    deny permission control
     _ATJOB_DIR/_LOCKFILE  job-creation lock file

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

     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.

     The at and batch utilities as presently implemented are not suitable when users are compet-
     ing for resources.  If this is the case, another batch system such as nqs may be more suit-

     Specifying a date past 2038 may not work on some systems.

     At was mostly written by Thomas Koenig <ig25@rz.uni-karlsruhe.de>.  The time parsing rou-
     tines are by
     David Parsons <orc@pell.chi.il.us>, with minor enhancements by
     Joe Halpin <joe.halpin@attbi.com>.

BSD					 January 13, 2002				      BSD

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