rc0 man page on DigitalUNIX

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rc0(8)									rc0(8)

       rc0 - Runs command script executed when stopping the system


       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	 addi‐
       tion  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

       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  execut‐
       ing  the	 rc0 script and the commands located in the /sbin/rc0.d direc‐
       tory: 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

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

       Specifies the command path Specifies the	 directory  of	commands  that
       corresponds to the run level

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


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