SHUTDOWN(8)             GENIX Programmer's Manual             SHUTDOWN(8)



      NAME
           shutdown - close down the system at a given time

      SYNOPSIS
           /etc/shutdown [ -k ] [ -r ] [ -h ] time [ warning-message ... ]

      DESCRIPTION
           Shutdown provides an automated shutdown procedure which a super-user
           can  use  to  notify  users nicely when the system is shutting down,
           saving them from system  administrators,  hackers,  and  gurus,  who
           would otherwise not bother with niceties.

           Time is the time at which shutdown will bring the  system  down  and
           may  take  two formats: +number and hour:min.  The first form brings
           the system down in number minutes and the second brings  the  system
           down at the time of day indicated (as a 24-hour clock).

           At intervals which get closer  together  as  apocalypse  approaches,
           warning  messages are displayed at the terminals of all users on the
           system.  Five minutes before shutdown, or immediately if shutdown is
           in less than 5 minutes, logins are disabled by creating /etc/nologin
           and writing a message there.  If this file exists when a  user  logs
           in,  login(1)  prints  its  contents and exits.  The file is removed
           just before shutdown exits.

           At   shutdown   time   a   message   is   written   in   the    file
           /usr/adm/shutdownlog, containing the time of shutdown, who ran shut-
           down and the reason.  Then a terminate signal is  sent  at  init  to
           bring  the  system down to single-user state.  Alternatively, if -r,
           -h, or -k was used, then shutdown will exec reboot(8),  halt(8),  or
           avoid  shutting  the system down (respectively).  (If it isn't obvi-
           ous, -k is to make people think the system is going down!)

           The time of the shutdown and  the  warning  message  are  placed  in
           /etc/nologin  and  should be used to inform the users about when the
           system will be back up and why it is going down (or anything else).

      FILES
           /etc/nologin   tells login not to let anyone log in
           /usr/adm/shutdownlog     log file for succesful shutdowns.

      SEE ALSO
           login(1), reboot(8)

      BUGS
           Only allows you to kill the system between now and 23:59 if you  use
           the absolute time for shutdown.

           Times to shutdown are not nice and  round,  i.e.  ``shutdown  in  18
           seconds''.





      Printed 11/16/83                                                        1