SHUTDOWN(ADM)                      UNIX System V



     Name
          shutdown - terminates all processing


     Syntax
          /etc/shutdown [ -y ] [ -g[hh:]mm ] [ -i[0156sS] ]
          [ -f"mesg" ] [ -f FILE ] [ su ]


     Description
          The  primary  function  of  shutdown  is  to  terminate  all
          currently  running  processes  in  an  orderly  and cautious
          manner.  shutdown goes through the following steps:

          1.   All users logged on the system are notified to log  off
               the system by a broadcasted message.

          2.   /etc/init is called to perform the the actual shutdown.

          Only the super-user can execute the shutdown command.

          The options are as follows:

               -y        Runs the command silently.  If this option is
                         not   specified,  shutdown  will  prompt  for
                         confirmation to shut down the system.

               -g[hh:]mm Specifies the number  of  hours  and  minutes
                         before  shutdown  (maximum:  72  hours).   60
                         seconds is the default.  (To  shut  down  the
                         system  immediately  without  a grace period,
                         use /etc/haltsys or /etc/reboot).

               -i[0156sS]Specifies the init level to bring the  system
                         to  (see init(M)).  By default, the system is
                         brought to level 0.

               -fmesg    mesg is a message enclosed in  double  quotes
                         ("")  to  be sent to all terminals warning of
                         the  imminent  shutdown  during   the   grace
                         period.

               -fFILE    Similar to the -fmesg option, but FILE is the
                         pathname for a file containing the message.

          The optional su  argument  lets  the  user  go  single-user,
          without  completely shutting down the system (this option is
          identical to -i1 and is present for backwards  compatibility
          with   XENIX).    Broadcast  messages,  whether  default  or
          defined, are displayed at regular intervals during the grace
          period.  The closer the shutdown time, the more frequent the
          message:

               _________________________________________________
               |Time left until shutdown   Frequency of message |
               |________________________________________________|
               |Greater than 1 hour        Every hour           |
               |Greater than 15 minutes    Every 15 minutes     |
               |Less than 15 minutes       Every minute         |
               |________________________________________________|

          In general, if no options are specified, shutdown behaves as
          follows:

          1.   Prompt for confirmation

          2.   60-second grace period

          3.   Bring the system to init level 0

          4.   Broadcast default message prior to shutdown.


     See Also
          wall(ADM), boot(HW)


     Diagnostics
          The most common error diagnostic that will occur  is  device
          busy.  This diagnostic appears when a particular file system
          could not be unmounted.  See umount(ADM).


     Notes
          Once shutdown has been invoked, it must be allowed to run to
          completion  and must not be interrupted by pressing BREAK or
          DEL.

          shutdown does not work when executed  from  within  a  shell
          layer.

          shutdown locks the hard disk heads.

          shutdown was developed  at  the  University  of  California,
          Berkeley, and is used with permission.


     (printed 8/23/89)                          SHUTDOWN(ADM)