From owner-freebsd-questions@FreeBSD.ORG  Fri Aug 17 00:50:30 2007
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From: Chuck Swiger <cswiger@mac.com>
Date: Thu, 16 Aug 2007 17:42:08 -0700
To: vuthecuong <cuongvt@fpt.vn>
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Cc: freebsd-questions@freebsd.org
Subject: Re: deinstall all apps installed from ports
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On Aug 16, 2007, at 5:22 PM, vuthecuong wrote:
> I wonder how can I remove all apps, yes, all apps installed from  
> ports so that only
> freebsd 6.2 OS remains just by one command.
> I use portupgrade.

"man pkg_delete" suggests the -a flag:

      -a      Unconditionally delete all currently installed packages.

-- 
-Chuck