Re: Linux shutdown sequence

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Kyle wrote:
> Hi,
>
> I wonder if there is a general way of configuring the Linux shutdown
> sequence. E.g to run a script when the user typed shutdown now/telinit
> 0/reboot.

Sure. There are all sorts of ways.

Read the inittab(5) manpage ("man 5 inittab") and take a look at your
/etc/inittab file. In the file, you'll find lines that look like

# What to do at the "Three Finger Salute".
ca::ctrlaltdel:/sbin/shutdown -t5 -r now

# Runlevel 0 halts the system.
l0:0:wait:/etc/rc.d/rc.0

# Runlevel 6 reboots the system.
l6:6:wait:/etc/rc.d/rc.6

# What to do when power fails.
pf::powerfail:/sbin/genpowerfail start


The lines that contain a 0 between the first and second colon (in the example
above, the line that starts "l0:0:" is one) are instructions to init on what
to do when entering runstate 0 (the runstate that you get when you "shutdown
- -h" or "telinit 0" or "halt"). There are other lines (the ones with a 6
between the 1st and 2nd colon) that are run when entering runstate 6 (the
runstate that you get when you "shutdown -r" or "telinit 6" or "reboot").

Each of these lines names a script or program to be run, and each line is
executed in sequence. You can
- - locate a script that is currently executed from your inittab when you
shutdown, and add your script logic to it, or
- - add your own script to /etc/inittab using the appropriate syntax to have it
invoked on shutdown

In the above example inittab (from Slackware 10.1), if I wanted to add logic
that runs one of my own scripts when the user types "shutdown", I could add
logic to the /etc/rc.d/rc.0 (for halt) and /etc/rc.d/rc.6 (for reboot) scripts
identified by the l0 and l6 inittab entries, or I could add a new line to
/etc/inittab, /before/ the l0 and l6 lines that read something like
lx:06:wait:/etc/rc.d/rc.local.shutdown
and put my custom logic into the (new, local) /etc/rc.d/rc.local.shutdown script

Does this help?
- --
Lew Pitcher

Master Codewright & JOAT-in-training | GPG public key available on request
Registered Linux User #112576 (http://counter.li.org/)
Slackware - Because I know what I'm doing.
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