Shutdown script?

[elver]

There's /etc/rc.local to run stuff after boot, but is there anything similar to run commands on shutdown/reboot?

There's a large file that's being copied to a ramdisk on boot and we'd like to copy it back to the disk on shutdown / reboot / power failure / whatnot.

[PilotJLR]

Yes, for shutdown scripts, put a script in /etc/rc.d/rc0.d/
Like the default scripts in there, the filename needs to start with K, then a number. K means "stop" or "kill" and scripts are run starting with the smallest number after K, then moving up.
Then you can also apply the script to reboot by copying or linking the script into /etc/rc.d/rc6.d/