09-29-2008
Thanks Nua.
As per your definition
S:Single-user, booted to system console only, with only root filesystem mounted (as read-only)
s:Single user, identical to S except the current terminal acts as the system console
1:Single-user with local filesystems mounted (read-write)
if I execute df –h I can see the file system mount which are not part of root file system and after executing the run level as 1 I executing the command df –h I see the same output.
However I go the answer by searching is the forum and as per that if we go down from higher run level to lower run level. Say from init 3 to init 1 or init S/s system never goes to true level S/s. its only go that that level once we boot it from OK prompt with ‘boot –S or boot –s ‘. Also run level 1 need the good /etc/inittab where in same is not required by in the case of run level S/s.
Thanks Experts.
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rc2(8) System Manager's Manual rc2(8)
NAME
rc2 - Run command script executed when entering a multiuser run level
SYNOPSIS
rc2
DESCRIPTION
The rc2 script contains run commands that enable initialization of the system to a multiuser state; run level 2. In addition to commands
listed within the script itself, rc2 contains instructions to run certain commands found in the /sbin/rc2.d directory. The script defines
the conditions under which the commands execute; some commands run if the system is booting, other commands execute if the system is chang-
ing run levels.
By convention, files in the /sbin/rc2.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: K00lpd S00savecore S25uucp
In general, the system starts commands that begin with the letter "S" and stops commands that begin with the letter "K." Commands that
begin with the letter "K" run only when the system is changing run levels from a higher to a lower level. Commands that begin with the
letter "S" run in all cases. The numbering of commands in the /sbin/rc2.d directory is important since the numbers are sorted and the com-
mands are run in ascending order. Files in the /sbin/rc2.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 rc2 run commands, for example: s2:23:wait:/sbin/rc2 < /dev/console >
/dev/console 2>&1
The following operations are typical of those that result from executing the rc2 script and the commands located in the /sbin/rc2.d direc-
tory. The operation depends on which state the system is entering or exiting. Setting the time zone Checking the current run level Stop-
ping network services and daemons Starting (or stopping) system services and daemons Starting the cron daemon Setting up paging and dump
facilities Setting up uucp files
Setting the TIMEZONE variable is one of the first operations completed by the rc2 script. This action provides the default time zone for
subsequent commands.
FILES
Specifies the command path Specifies the directory of commands that correspond to the run level
RELATED INFORMATION
Commands: init(8), rc0(8), rc3(8) delim off
rc2(8)