Date: Tue, 1 Oct 2002 11:22:18 -0700 From: Brooks Davis <brooks@one-eyed-alien.net> To: Bruce Evans <bde@zeta.org.au> Cc: freebsd-bugs@FreeBSD.ORG Subject: Re: bin/43434: New option to 'dmesg' which allow to display or not old boot messages Message-ID: <20021001112217.A19820@Odin.AC.HMC.Edu> In-Reply-To: <200210011710.g91HA6AC022255@freefall.freebsd.org>; from bde@zeta.org.au on Tue, Oct 01, 2002 at 10:10:06AM -0700 References: <200210011710.g91HA6AC022255@freefall.freebsd.org>
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On Tue, Oct 01, 2002 at 10:10:06AM -0700, Bruce Evans wrote:
>=20
> What's wrong with ``grep [-C] <magic> /var/log/messages'' then? :-)
> (except it doesn't handled rotated log files or races with newsyslog ...=
).
> It handles rotation a bit better than dmesg -- my message buffer gets
> rotated by debugging cruft and doesn't keep boot messages for long.
> Some magic would be required to find the last message without tags.
> Printing only the very last message doesn't seem very useful anyway.
> Lastness depends on an arbitrary descision about where the boot ends.
99+% of the time when a user types dmesg what they really want to see is:
Copyright (c) 1992-2002 The FreeBSD Project.
Copyright (c) 1979, 1980, 1983, 1986, 1988, 1989, 1991, 1992, 1993, 1994
The Regents of the University of California. All rights
reserved.
FreeBSD 5.0-CURRENT #2: Thu Sep 26 14:33:02 PDT 2002
root@minya.sea.one-eyed-alien.net:/usr/obj/usr/src/sys/GENERIC
Preloaded elf kernel "/boot/kernel/kernel" at 0xc06ca000.
Preloaded elf module "/boot/kernel/snd_maestro3.ko" at 0xc06ca0a8.
=2E..
For the _current_ boot. They couldn't care less about previous boots
unless they are looking for a message to diagnose a crash. Currently if
you don't have extra debugging stuff on and you don't generate a lot of
errors, you typicaly find boot messages repeated several times, especialy
in -stable. Thus you have to carefully scroll though the whole list to
find the current boot. This change makes dmesg do what the user wants,
but allows access to the previous messages in the unlikely event they
are needed.
-- Brooks
--=20
Any statement of the form "X is the one, true Y" is FALSE.
PGP fingerprint 655D 519C 26A7 82E7 2529 9BF0 5D8E 8BE9 F238 1AD4
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