[systemd-devel] I need a killall.service in beta fc 15 (systemd installed by default)

[Floydsmith at aol.com]

I guess this might be somthing like:
cd /
ln -sf  ../../../lib/systemd/system/3.target 
etc/systemd/system/default.target
but  with 3 replaced by 6 (for shutdown).
 
I need such a service so that I on shutdown I can have a script (like  
killall) do custom things with the BIOS time and backup a few files.
 
How to I create such a service?
 
Any help will be greatly appreciated.
 
Floyd,
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