shutdown(1M)          UNIX System V(Essential Utilities)           shutdown(1M)


NAME
      shutdown - shut down system, change system state

SYNOPSIS
      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.

      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


10/89                                                                    Page 1

shutdown(1M)          UNIX System V(Essential Utilities)           shutdown(1M)


           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 /etc/inittab;  configure a new bootable
           operating system, if necessary, before the reboot.  The rc6
           procedure is called to do this work.

NOTES
      shutdown(1M) behaves differently depending on the number of users logged
      in.  If several users are logged in, three messages are displayed,
      warning, final and confirmation, with grace period between each message.
      If only the user issuing shutdown(1M) is logged in, two messages are
      displayed, the final and confirmation message, with grace period between
      them.

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
































Page 2                                                                    10/89