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Full Discussion: What is the diffe b/w init s and init S
Operating Systems Solaris What is the diffe b/w init s and init S Post 302465544 by jlliagre on Friday 22nd of October 2010 05:29:10 PM
Old 10-22-2010
Quote:
Originally Posted by snchaudhari2
init S:

will take you in the system maintenance mode, where you can use fsck on mounted file systems or to repair file systems...
use fsck on mounted filesystems ???, I hope not unless you remount them in read/only mode.
Quote:
init s

will take you in the single user mode, where you can unmount your whole file system and mount it on /a or /mnt and can make changes to filesystems...you can also use fsck here.
You are partially describing here the failsafe boot mode, not a run level.
Quote:
In short,
if you just need to do file system check, you can use "init S". and if you want to modify files, blocks, cylinders, you can use "init s"
Hmm, how do you modify blocks and cylinders in a file system context ?
Quote:
Correct me if I am not....
I'm afraid you are confusing the failsafe boot mode, the administrative run level and the single user mode. Switching from multi-user to the "s" and "S" states is exactly the same operation* and put the OS in single user mode while "init 1" put the it in system administrator mode. Booting to failsafe mode cannot be achieved with the init command alone.

* this can be confirmed by looking at init source code: http://src.opensolaris.org/source/xref/onnv/onnv-gate/usr/src/cmd/init/init.c#lvlname_to_state
 

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LEARN ABOUT DEBIAN

runit-init

runit-init(8)						      System Manager's Manual						     runit-init(8)

NAME

       init - a UNIX process no 1

SYNOPSIS

       init [ 0 | 6 ]

DESCRIPTION

       runit-init is the first process the kernel starts.  If runit-init is started as process no 1, it runs and replaces itself with runit(8).

       If runit-init is started while the system is up, it must be either called as init 0 or init 6:

       init 0 tells  the  Unix	process  no 1 to shutdown and halt the system.	To signal runit(8) the system halt request, runit-init removes all
	      permissions of the file /etc/runit/reboot (chmod 0), and sets the execute by owner permission of the file  /etc/runit/stopit  (chmod
	      100).  Then a CONT signal is sent to runit(8).

       init 6 tells  the  Unix	process no 1 to shutdown and reboot the system.  To signal runit(8) the system reboot request, runit-init sets the
	      execute by owner permission of the files /etc/runit/reboot and /etc/runit/stopit	(chmod	100).  Then  a	CONT  signal  is  sent	to
	      runit(8).

EXIT CODES

       runit-init returns 111 on error, 0 in all other cases.

SEE ALSO

       runit(8), runsvdir(8), runsvchdir(8), sv(8), runsv(8), chpst(8), utmpset(8), svlogd(8)

       http://smarden.org/runit/

AUTHOR

       Gerrit Pape <pape@smarden.org>

																     runit-init(8)
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