Like the UNIX "which" tool, but for Ruby libraries.
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ruby-which.gemspec

README

= ruby-which

by Pistos
http://github.com/Pistos/ruby-which

For those times when you don't know which version of a library you're
require-ing, or what path on your system it's coming from.  Returns the full
library path if the given library is found in the $LOAD_PATH.

"you need organization..." -- manveru

== Installation

    gem install --source http://gems.github.com Pistos-ruby-which

== Example usage:

    require 'rubygems'
    require 'ruby-which'
    puts Which.which( 'm4dbi' )   #=> /usr/lib/ruby/gems/1.8/gems/m4dbi-0.6.2/lib/m4dbi.rb

Or from your shell:

    rwhich m4dbi
    # Outputs: /usr/lib/ruby/gems/1.8/gems/m4dbi-0.6.2/lib/m4dbi.rb