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From: Chuck Swiger <cswiger@mac.com>
Date: Mon, 16 Oct 2006 11:01:41 -0700
To: Simon Gao <gao@schrodinger.com>
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Cc: freebsd-questions@freebsd.org
Subject: Re: What's so compelling about FreeBSD?
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On Oct 16, 2006, at 10:45 AM, Simon Gao wrote:
> I have a few FreeBSD machine from 4.x to 5.x. I have asked people  
> how to
> upgrade them to latest version 6.x cleanly. All I was told is that I
> need to wipe them out and reinstall. However, this is not the case  
> with
> Gentoo Linux.

It's not the case with FreeBSD either.
Read the fine Handbook, or /usr/src/UPDATING...

-- 
-Chuck