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Date:      Tue, 16 Mar 1999 17:47:10 +1030
From:      Greg Lehey <grog@lemis.com>
To:        Roelof Osinga <roelof@eboa.com>
Cc:        freebsd-questions@FreeBSD.ORG
Subject:   Re: Have crashed, won't travel
Message-ID:  <19990316174710.H429@lemis.com>
In-Reply-To: <36DE0352.E99BCB70@eboa.com>; from Roelof Osinga on Thu, Mar 04, 1999 at 04:51:46AM %2B0100
References:  <36DCB59E.F16D5539@eboa.com> <19990303195632.B441@lemis.com> <36DDBFEB.86D89D20@eboa.com> <19990304095813.I441@lemis.com> <36DDEFFD.A4DB4978@eboa.com> <19990304130126.B441@lemis.com> <36DE0352.E99BCB70@eboa.com>

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On Thursday,  4 March 1999 at  4:51:46 +0100, Roelof Osinga wrote:
> Greg Lehey wrote:
>>> However I am quite new to FreeBSD, maybe these (boot) messages get stored
>>> and kept for a few revisions like the maillog?
>>
>> They're in /var/log/messages, and also (just the boot messages) in
>> /var/run/dmesg.boot.  You can also display the contents of the message
>> buffer with dmesg, but after the machine's been up for a while it gets
>> overwritten with other messages.
>
> So I noticed. The top is either all gibberish or some fancy ANSI codes
> that are totally wasted on my telnets <g>. E.g.
>
>   "\^[[17;1H\^[[m\^[[19;1H\^[[m\^[[20;1H\^[[m\^[[21;1H\^[[m\^[[17;"
>
> etc., for about 10K. 

This junk is the record of what you entered to the visual UserConfig.
The gibberish are control codes for the terminal emulation.

>> The kind of damage done to a file system is usually in the structure
>> rather than in the individual files.  A make world wouldn't do much to
>> help there.  In general, if it complains about problems, but still
>> comes up, it has solved those problems.
>
> Well, I can't recollect having ever experienced file corruption with an
> unix system but I do have experienced them with other OSs. Also I have
> lost whole filesystems due to superblock problems. Granted, this was
> with Microsoft Xenix, but ...

Well, XENIX had a pretty typical old-style file system layout.  ufs is
better, and doesn't get so corrupted.

>> You might find it interesting to try.  It won't solve the (possible)
>> problem at hand.
>
> It came up in single user mode. So I could easily recheck the filesystems.
> It didn't find any problems, so I guess it's probably Ok.

You can assume that's OK.  It isn't always, but I've seen very very
few instances of file system damage which wasn't detected by fsck.

Greg
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