




Command:   at, atrun - execute commands at a later time
Syntax:    at time [month day] [file]
Flags:     (none)
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

     At prepares a file to be executed later at the  specified  time  by
creating  a  special entry in /usr/spool/at. The program atrun should be
started periodically, for example, every minute by cron.   Atrun  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 stdin or stdout
unless specifically redirected.  In the first example above, it might be
necessary  to  put  >/dev/tty0 on some lines in the shell script myfile.
The same holds for the commands typed directly to at.








































                                                                        

