How to run a script before shutdown?

From	Robert Latest <boblatest@gmail.com>
Newsgroups	linux.debian.user
Subject	How to run a script before shutdown?
Date	2016-11-13 20:40 +0100
Message-ID	<sD8Nb-4Dx-9@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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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Thread

How to run a script before shutdown? Robert Latest <boblatest@gmail.com> - 2016-11-13 20:40 +0100
  Re: How to run a script before shutdown? Sven Joachim <svenjoac@gmx.de> - 2016-11-13 21:30 +0100
    Re: How to run a script before shutdown? Robert Latest <boblatest@gmail.com> - 2016-11-14 18:50 +0100
  Re: How to run a script before shutdown? David Christensen <dpchrist@holgerdanske.com> - 2016-11-14 02:40 +0100
    Re: How to run a script before shutdown? rhkramer@gmail.com - 2016-11-14 13:40 +0100
      Re: How to run a script before shutdown? Jude DaShiell <jdashiel@panix.com> - 2016-11-14 16:30 +0100
        Re: How to run a script before shutdown? rhkramer@gmail.com - 2016-11-14 18:10 +0100
        Re: A_Message_Regarding_Your_DEBT_Situation. vs78 Jude DaShiell <jdashiel@panix.com> - 2016-11-14 22:30 +0100
          Re: A_Message_Regarding_Your_DEBT_Situation. vs78 Lisi Reisz <lisi.reisz@gmail.com> - 2016-11-14 23:20 +0100
            Re: A_Message_Regarding_Your_DEBT_Situation. vs78 Jude DaShiell <jdashiel@panix.com> - 2016-11-16 12:50 +0100
              Re: A_Message_Regarding_Your_DEBT_Situation. vs78 Tony van der Hoff <tony@vanderhoff.org> - 2016-11-16 13:00 +0100
  Re: How to run a script before shutdown? Michael Lange <klappnase@freenet.de> - 2016-11-14 11:30 +0100
    Re: How to run a script before shutdown? Hans <hans.ullrich@loop.de> - 2016-11-14 11:50 +0100

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