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From: "Helmut Schneider" <jumper99@gmx.de>
Date: Mon, 12 Sep 2011 20:24:44 +0000 (UTC)
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Subject: Re: Print +REQUIRED_BY as tree?
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Lev Serebryakov wrote:

>   Is here console tool, which shows dependency tree of installed ports
> from "required" port to "users"? pkg_tree performs opposite task.
> 
>   +REQUIRED_BY is flat list, unfortunately.
> 
>   I need to investigate exact path why this port is installed on my
>  system :)

Neither I'm a perl expert nor it is final but hth anyway.

http://www.charlieroot.de/bsd/pkg_depends.pl