NAME

     shutdown - graciously close the system down


SYNOPSIS

     shutdown [-hrRmk] [-x code] [time-specification [message]]


DESCRIPTION

     Shutdown is a program which  allows  a  system  operator  to
     close  down  the system in an nice way. Shutdown informs the
     users why and when the system is going down.   This  warning
     is  issued  10 minutes before shutdown time and every minute
     in the last 5 minutes.  At this time (5  minutes),  shutdown
     creates  a  file /etc/nologin to prevent new users from log-
     ging in.

     Shutdown keeps a logfile of shutdowns.   Every  shutdown  is
     registered  in  /usr/adm/wtmp,  if  this file exists, and by
     syslog(3) (level auth.notice).  After these actions, a  call
     is done to reboot(2) which actually brings the system down.

     Time-specification may be something like 15:00, 15.00,  +15,
     or  now  for a shutdown at 3pm (twice), 15 minutes from now,
     or immediately.

     The message may be used to describe why the system is  going
     down,  it  may  also  be typed on standard input with the -m
     option.


OPTIONS

     -h   This flag prevents the system from rebooting after  the
          shutdown.   The system can now be powered off.  This is
          the default.

     -r   This flag indicates that the system should reboot after
          shutting down.

     -R   Reboot the system by resetting it.  Normally the kernel
          will  try  to  return to the Boot Monitor.  With -R the
          system will receive a hardware reset.

     -x code
          Halt the system and let the Monitor execute  the  given
          code  as  if  typed at the monitor prompt.  You can for
          instance use -x 'boot hd0' as a very fast way to reboot
          "from the top."

     -m   Allows the operator to type a shutdown message on stan-
          dard   input,  that  will  be  added  to  the  messages
          displayed on all terminals.

     -k   This option gives the  possibility  of  terminating  an
          already  started  shutdown.   This  is only possible if
          shutdown time has not yet arrived.

     -C   Check if the system crashed.  This option is  not  used
          at  shutdown time, but at reboot time.  It tells if the
          file systems should be checked by testing if  the  last
          entry  in  the wtmp file is a shutdown entry.  (A crude
          replacement for a file system clean flag.)


SEE ALSO

     reboot(2), syslog(3), halt(8), boot(8).


AUTHOR

     Edvard Tuinder (v892231@si.hhs.NL)