shutdown(1M)      MISC. REFERENCE MANUAL PAGES       shutdown(1M)



NAME
     shutdown - shut down system, change system state

SYNOPSIS
     /usr/sbin/shutdown [ -y ] [ -ggrace_period [ -iinit_state ]

DESCRIPTION
     This command is executed by the  super-user  to  change  the
     state  of  the machine.  In most cases, it is used to change
     from the multi-user state (state 2) to  another  state  (see
     below).   By  default, it brings the system to a state where
     only the console has access to the UNIX system.  This  state
     is called single-user (see below).

     The command sends a warning  message  and  a  final  message
     before  it  starts  actual shutdown activities.  By default,
     the command asks for confirmation before it starts  shutting
     down daemons and killing processes.  The options are used as
     follows:

     -y   pre-answers the confirmation question  so  the  command
          can  be run without user intervention.  A default of 60
          seconds is allowed between the warning message and  the
          final  message.   Another 60 seconds is allowed between
          the final message and the confirmation.

     -ggrace_period
          allows the super-user to change the number  of  seconds
          from the 60-second default.

     -iinit_state
          specifies the state that init is to be put in following
          the  warnings,  if any.  By default, system state ``s''
          is used.

     Other recommended system state definitions are:

     state 0
          Shut the machine down so  it  is  safe  to  remove  the
          power.   Have  the machine remove power if it can.  The
          rc0 procedure is called to do this work.

     state 1
          State 1 is referred to as the administrative state.  In
          state  1 filesystems required for multi-user operations
          are mounted, and logins requiring access to  multi-user
          filesystems can be used.  When the system comes up from
          firmware mode into state 1, only the console is  active
          and  other  multi-user  (state 2) services are unavail-
          able.  Note that not all  user  processes  are  stopped
          when transitioning from multi-user state to state 1.




                Last change: Essential Utilities                1

shutdown(1M)      MISC. REFERENCE MANUAL PAGES       shutdown(1M)



     state s, S
          State s (or S) is referred to as the single-user state.
          All  user  processes are stopped on transitions to this
          state.  In the single-user state, filesystems  required
          for  multi-user logins are unmounted and the system can
          only be accessed through the console.  Logins requiring
          access to multi-user file systems cannot be used.

     state 5
          Stop the UNIX system and go to firmware mode.

     state 6
          Stop the UNIX system and reboot to the state defined by
          the  initdefault  entry  in /sbin/inittab;  configure a
          new bootable operating system, if necessary, before the
          reboot.  The rc6 procedure is called to do this work.

SEE ALSO
     init(1M), rc0(1M), rc2(1M), rc6(1M), inittab(4).




































                Last change: Essential Utilities                2