On Fri, Jun 16, 2000 at 12:34:48AM +1000, Robert Elz wrote:
> do_dmesg()
> {
> 	mv /var/log/dmesg.boot /var/log/dmesg.boot-
> 	dmesg $dmesg_flags > /var/log/dmesg.boot
> 	(echo -n "Booted at: "; date) >> /var/log/dmesg.history
> 	cat /var/log/dmesg.boot >> /var/log/dmesg.history
> }

or with the compare-it-first idea:
	if ! cmp -s /var/log/dmesg.boot /var/log/dmesg.boot- ; then
		mv ...
		dmesg ... > ...
	fi
so you actually keep the last different dmesg output.

eric