rc.local for shutdown?

[Tom Horsley]

You can put random stuff to do at boot in /etc/rc.d/rc.local
and it will get run last thing at boot time.

Just out of curiosity, is there an equivalent file you
can get to run just before everything else at reboot or
shutdown time?

[Matthew Miller]

On Fri, Jun 21, 2013 at 02:32:45PM -0400, Tom Horsley wrote:
> You can put random stuff to do at boot in /etc/rc.d/rc.local
> and it will get run last thing at boot time.
> Just out of curiosity, is there an equivalent file you
> can get to run just before everything else at reboot or
> shutdown time?

You can do this by making a systemd service unit which triggers on the
shutdown, reboot, and halt targets. See 
http://unix.stackexchange.com/q/39226/2511
for some examples.