shutdown(1M)                                                   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 unavailable.  Note that not all user processes are stopped
              when transitioning from multi-user state to state 1.




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   shutdown(1M)                                                   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).


































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