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Full Discussion: Script calling by inittab
Top Forums Shell Programming and Scripting Script calling by inittab Post 302990404 by rbatte1 on Thursday 26th of January 2017 04:59:21 AM
Old 01-26-2017
Given that /etc/inittab is a system file that could be replaced during an upgrade (okay, so you probably won't be patching AIX 4) I would suggest it is a bad place to put things. Assuming it has the line marked rc, then a better place to put things would be in /etc/rc.d/rc2.d (or whatever is the default run-level marked in /etc/inittab)

The files in there starting with a capital S are run with the parameter start when moving into that run-level. Have a look at a few to see how they are generally written. You will probably find that they are linked (hard or soft) to /etc/init.d and there are often comparable K scripts which are called when stopping a service.

The files are executed in sequence that they are found, so S20inet runs before S95Oracle or whatever you have defined.

You can put all sorts in here. They are generally Bourne Shell scripts, but you can override this with the usual #!/bin/ksh or even #!/bin/csh in the first line. You can then go on and set up your environment and fire up the code you really want.


Does that help? Generally you would use S99myscript so that all other processes to do with mounting filesystems, starting services etc. have all completed before you try to do your stuff.


Don't worry about AIX 4 either. It's not too long ago that I eventually retired an AIX 3.2.5 server Smilie
We moved the applications to AIX 4.3.3 Smilie



Robin
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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 file descriptor limit for all processes # to 8192. The soft limit is still 1024, but any unprivileged # process can increase its soft limit up to the hard limit # with "ulimit -Sn xxx" (needs a 2.2.13 or later Linux kernel). ulimit -Hn 8192 # Execute the program. eval exec "$4" NOTES
This script is not meant as startup script for daemons or somesuch. It has nothing to do with a rc.local style script. It's just a handler for things executed from /etc/inittab. Experimenting with this can make your system un(re)bootable. FILES
/etc/inittab, /etc/initscript. AUTHOR
Miquel van Smoorenburg ,<miquels@cistron.nl> SEE ALSO
init(8), inittab(5). July 10, 2003 INITSCRIPT(5)
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