From: Kaspar Schiess <eule@...>
Date: 2009-12-01T17:54:24+09:00
Subject: Re: Detect the path used to require a file?

> I'm having a problem in which a file is being required twice, using
> slightly different paths, and I want to track down where this is
> happening.  Is there a way I can print out the path used to require a
> given file?

In most Ruby implementations the __FILE__ constant will be different 
depending on how the file was loaded. Notably, it will reflect the path 
used to load the file.

== test.rb ==
puts __FILE__
=============

 > ruby -r test.rb -e ''	
./test.rb

 > ruby -r /home/user/temp/test.rb
/home/user/temp/test.rb

regards,
kaspar