at(1)

NAME
     at, atrun - execute commands at a later time

SYNOPSIS
     at time [month day] [file]

EXAMPLES

     at 2315 Jan 31 myfile
                         # Myfile executed Jan 31 at 11:15 pm

     at 0900             # Job input read from stdin

     at 0711 4 29        # Read from stdin, exec on April 29

DESCRIPTION

     At prepares a file to be executed later at the specified time by creating
     a  special  entry  in  /usr/spool/at.   The  cron  daemon  takes  care of
     executing these jobs.  It checks to see if  any  files  in  /usr/spool/at
     should  now  be  run,  and  if  so,  it  runs  them and then puts them in
     /usr/spool/at/past.  The name of the file created in /usr/spool/at by  at
     is YY.DDD.HHMM.UU (where YY, DDD, HH, and MM give the time to execute and
     UU is a unique number).  Note that when the command runs, it will not  be
     able  to  use  standard  input  unless specifically redirected.  Standard
     output will be mailed to the owner of the job.

SEE ALSO
     cron(8).