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From: Sam Lawrance <lawrance@FreeBSD.org>
Date: Fri, 8 Dec 2006 21:13:21 +1100
To: Erwin Van de Velde <erwin.vandevelde@gmail.com>
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Cc: freebsd-ports@freebsd.org
Subject: Re: Cleaning out the ports
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On 08/12/2006, at 9:04 PM, Erwin Van de Velde wrote:

> Dear all,
>
> I am looking for a good way to clean out the installed ports: when  
> having used
> a system for some time, one is often left with leave ports that do  
> not have
> any direct use (e.g. a library) and are not required anymore by any  
> other
> installed port. Is there a way to find such ports and remove them  
> easily?

pkg_cutleaves (available from sysutils/pkg_cutleaves) will help you  
to identify packages that are not required.