07-22-2002
From the perspective of a kernel programmer, at start-up time, unix will mount the root filesystem and then launch the program called init. Exactly what happens next depends on your local version of init. Since you say that you have a System V unix version, you pretty much must have a file called /etc/inittab. And this file will control the start up procedure.
A typical entry in a SunOS inittab is:
s3:3:wait:/bin/rc3
which says, as we transistion into run state 3, we will run the script /bin/rc3. And it has other entries for each run-level. By studying those scripts we can learn exactly what they do.
If I really wanted to, I could take a SunOS system and write my own start-up and shutdown scripts. I would just need to change /etc/inittab to point to my own scripts instead of Sun's. This would not be wise, but it is possible. Something like this may have happened on your system. But if you know scripting well, should should be able to track everything down from /etc/inittab. (And if you don't have a /etc/iniitab, study your man page for init to see how it works.)
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LEARN ABOUT REDHAT
initscript
INITSCRIPT(5) Linux System Administrator's Manual INITSCRIPT(5)
NAME
initscript - script that executes inittab commands.
SYNOPSIS
/bin/sh /etc/initscript id runlevels action process
DESCRIPTION
When the shell script /etc/initscript is present, init will use it to execute the commands from inittab. This script can be used to set
things like ulimit and umask default values for every process.
EXAMPLES
This is a sample initscript, which might be installed on your system as /etc/initscript.sample.
#
# initscript Executed by init(8) for every program it
# wants to spawn like this:
#
# /bin/sh /etc/initscript <id> <level> <action> <process>
#
# Set umask to safe level, and enable core dumps.
umask 022
ulimit -c 2097151
PATH=/bin:/sbin:/usr/bin:/usr/sbin
export PATH
# Increase the hard filedescriptor limit for all processes
# to 8192. The soft limit is still 1024, but any unpriviliged
# process can increase it's soft limit up to the hardlimit
# with "ulimit -Sn xxx" (needs a 2.2.13 or later Linux kernel).
ulimit -Hn 8192
# Execute the program.
eval exec "$4"
FILES
/etc/inittab, /etc/initscript.
AUTHOR
Miquel van Smoorenburg ,<miquels@cistron.nl>
SEE ALSO
init(8), inittab(5).
December 24, 1999 INITSCRIPT(5)