From owner-freebsd-questions  Thu May 10 19:15:55 2001
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Date: Thu, 26 Apr 2001 12:14:06 +1000 (EST)
Subject: RE: dmesg buffer between reboots
From: "Aaron Hill" <fbsdlist@futureuse.net>
To: darryl@osborne-ind.com
In-Reply-To: <001b01c0d952$246e54d0$0701a8c0@darryl>
References: <001b01c0d952$246e54d0$0701a8c0@darryl>
Cc: freebsd-questions@freebsd.org
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> dmesg > dmesg_sav.  Puts the contents into a file name for
> preservation.  The question then becomes, how to automate
> it so that it is done everytime before shutdown.  
> 
> -Darryl

Remember that any scripts in /usr/local/etc/rc.d are executed with the 
argument stop when the system shuts down. So if you wanted to save dmesg on 
each shutdown/reboot you could create a file called savedmesg.sh in that 
directory with the following contents ...

#!/bin/sh

# This script saves the dmesg on shutdown

# only run on system shutdown
if [ "$1" = "stop" ]; then
      dmesg > /var/log/dmesg.`date '+%d%m%y.%H%M'`
fi


You would get dmesg saved to a file reflecting the date and time everytime 
you shutdown the machine. The filename would look 
like /var/log/dmesg.110501.1210 for the 11th day of the 5th month in the 
year 01, time 12:10. Obviously reverse the day and month around to suit 
your standards.

Don't forget to make the file executable:
   chmod 750 /usr/local/etc/rc.d/savedmesg.sh


Yeah I know it's rough.  :-)

Aaron






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