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Date: Fri, 10 Mar 2006 11:26:34 +0000
From: Alex Zbyslaw <xfb52@dial.pipex.com>
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To: Bob Johnson <fbsdlists@gmail.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: coming back up after power failure (UPS)
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Bob Johnson wrote:

>-  When the UPS believes it is about to run out of battery power and
>shut down, the OS shuts down to single user mode and starts a script
>that will reboot the  system in five minutes (or long enough to be
>sure the batteries will run down first).
>- If the UPS does shut down, when power is restored, the BIOS will
>detect the event and power up the PC normally.  It will boot as
>normal.
>- If the UPS never shuts down (because line power is restored) the
>script eventually times out and reboots the system anyway.
>
>I tried to make this work a few years ago, but could find no way to
>start a script after shutting down to single user mode.   I posted a
>query about it but got no replies, so I quit worrying about it.  I've
>since seen some hint that it is now possible to do that, but I didn't
>follow it up.  Can anyone tell me how to do that?
>

man rc.d :-)  Every script in /etc/rc.d with a shutdown keyword will be 
run when shutting down with the param "stop".  If your NUT shutdown 
script touched some special file, your rc.d script could key off that to 
do a reboot in 5 minutes.  I thinks that's what you're describing.

--Alex