Provided by: at_3.1.10ubuntu4_i386 bug

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

DESCRIPTION

       at and batch read commands from standard  input  or  a  specified  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.   The
               format  of  the output lines (one for each job) is: Job number,
               date, hour, queue, and username.

       atrm    deletes jobs, identified by their job number.

       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 atd.

       At allows fairly complex time  specifications,  extending  the  POSIX.2
       standard.   It  accepts  times  of  the  form  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 suffixed 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.  The
       specification of a date must follow the specification of  the  time  of
       day.   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.

       The  exact  definition  of  the  time  specification  can  be  found in
       /usr/share/doc/at/timespec.

       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, 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
       /usr/sbin/sendmail.  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 designations range from a to z.  and
               A  to Z.  The a queue is the default for at and the b queue for
               batch.  Queues with higher letters run with increased niceness.
               The  special queue "=" is reserved for jobs which are currently
               running.

       If a job is submitted to a queue designated with an  uppercase  letter,
       the  job is treated as if it were submitted to batch at the time of the
       job.  Once the time is reached, the batch processing rules with respect
       to  load average apply.  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.

       -v      Shows  the  time the job will be executed before reading
               the job.

       Times displayed will be in  the  format  "Thu  Feb  20  14:50:00
       1997".

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

FILES

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

SEE ALSO

       cron(1), nice(1), sh(1), umask(2), atd(8).

BUGS

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

       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.

AUTHOR

       At   was   mostly   written   by   Thomas  Koenig,  ig25@rz.uni-
       karlsruhe.de.