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How to run a script before shutdown?



Hi all,

I want to automatically start a data backup script (to USB or network
drive) at each shutdown of my computer. I did some research into this
and found that several people have the same problem as I do. But the
threads I found petered out into discussions of several ways of doing
this, working for some people and not for others.  So here I am
wondering if there is a canonical, proper and reliable method of doing
this.

The script needs to run when a shutdown (but not a reboot) is started
while networking and USB mounts are still up, and (preferably)
multi-user mode has turned off. Perusing the systemd documentation I
found all kinds of good examples of how to start stuff in a well-ordered
manner to get the system up, but for shutting down there is quite little
information.

How is it done?

robert


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