atrm

NAME

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

SYNOPSIS

       at [-V] [-q queue] [-f file] [-mldbv] TIME
       at -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 speci-
       fied  file which are to be executed at a later time, using
       /bin/sh.

       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 as read from
               /proc/loadavg drops below 1.5, or the value speci-
               fied 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.)   You  may  also  specify  midnight,
       noon, or teatime (4pm) and you can have a time-of-day suf-
       fixed with AM or PM for running  in  the  morning  or  the
       evening.   You  can also say what day 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 or
       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 and you can tell at 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,  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  exe-
       cuted.  The working directory, the environment (except for
       the variables TERM, 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 stan-
       dard output from his commands, if any. Mail will  be  sent
       using  the  command  /bin/mail.   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 /etc/at.allow and /etc/at.deny.

       If the file /etc/at.allow exists, only usernames mentioned
       in it are allowed to use at.

       If /etc/at.allow does not exist, /etc/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.

       An empty /etc/at.deny means that every user is allowed use
       these commands, this is the default configuration.

OPTIONS

       -V      prints the version number to standard error.

       -q queue
               uses the specified  queue.   A  queue  designation
               consists  of a single letter; valid queue designa-
               tions 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 desig-
               nated 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 Reads 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      cats  the jobs listed on the command line to stan-
               dart output.

FILES

       /var/spool/atjobs
       /var/spool/atspool
       /proc/loadavg
       /etc/utmp
       /etc/at.allow
       /etc/at.deny

SEE ALSO

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

BUGS

       The correct operation of batch for Linux  depends  on  the
       presence of a proc- type directory mounted on /proc.

       If the file /etc/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 vari-
       able 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.

AUTHOR

       At was mostly written by Thomas Koenig,  ig25@rz.uni-karl-
       sruhe.de.  The time parsing routines are by David Parsons,
       orc@pell.chi.il.us.