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Date: Wed, 26 Jun 2013 16:50:51 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Jeremy Chadwick <jdc@koitsu.org>
Subject: Re: portupgrade(1) | portmaster(8) -- which is more effective for
 large upgrade?
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On Wed, 26 Jun 2013, Jeremy Chadwick wrote:

> When rebuilding everything, I have always resorted to this:
>
> rsync -avH /usr/local/ /usr/local.old/
> pkg_delete -a -f
> rm -fr /usr/local/*
> rm -fr /var/db/ports/*
> rm -fr /usr/ports/distfiles/*
> cd /usr/ports/whatever
> make install clean
> {lather rinse repeat until done}

I don't generally rebuild from scratch, but there is a procedure at the 
end of the portmaster man page for doing it.

Something that should be mentioned: if you are not deleting and 
reinstalling everything, always--yes, always--check the new entries in 
/usr/ports/UPDATING first.