How to run a command just after shutdown or halt in Debian?

If you have a look in etc/init. D you'll see a script called halt . I'm pretty certain that when sbin/halt is called in a runlevel other than 0 or 6, it calls sbin/shutdown which runs this script (unless called with an -n flag).

So maybe you could add your own hook into that script? Obviously, it would be before the final halt was called, but nothing runs after that, so maybe that's ok.

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