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rc0(8)
NAME
  rc0 - Runs command script executed when stopping the system

SYNOPSIS
  rc0

DESCRIPTION
  The rc0 script contains run commands that enable a smooth shutdown and
  bring the system to a single-user state; run levels 0 and s.	In addition
  to commands listed in within the script itself, rc0 contains instructions
  to run commands found in the /sbin/rc0.d directory.  The script defines the
  conditions under which the commands execute; some commands run if the
  system is being shut down while others run if the system is being shut down
  and rebooted to single user.

  By convention, files in the /sbin/rc0.d directory begin with either the
  letter "K" or the letter "S" and are followed by a two-digit number and a
  filename, for example:

       K00enlogin     K05lpd	 K60cron     K30nfs

  In general, the system starts commands that begin with the letter "S" and
  stops commands that begin with the letter "K." The numbering of commands in
  the /sbin/rc0.d directory is important since the numbers are sorted and the
  commands are run in ascending order.	Files in the /sbin/rc0.d directory
  are normally links to files in the /etc/init.d directory.

  An entry in the inittab file causes the system to execute the rc0 script,
  for example:

       ss:Ss:wait:/sbin/rc0 shutdown < /dev/console > /dev/console 2>&1
       s0:0:wait:/sbin/rc0 off < /dev/console > /dev/console 2>&1

  The following operations are typical of those that result from executing
  the rc0 script and the commands located in the /sbin/rc0.d directory:

    ·  Notify users that the system is shutting down.

    ·  Sync the disks

    ·  Stop system services and daemons

    ·  Stop processes

    ·  Kill processes

    ·  Unmount file systems

    ·  Invoke init if the system is being shut down to single user


  The killall command sends a SIGTERM signal to stop running processes;
  SIGKILL follows to kill all processes except the process which initiated
  the call.  The umount -a command unmounts all file systems except the root
  file system.


FILES
  /sbin/rc0 Specifies the command path

  /sbin/rc0.d
	    Specifies the directory of commands that corresponds to the run
	    level

RELATED INFORMATION
  Commands: init(8), killall(8), rc2(8), rc3(8), shutdown(8)