A 'which' command written entirely in Ruby--windows friendly [searches for .bat files, etc. appropriately]
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whichr.gemspec

README

ruby which: the linux "which" command re-written in ruby [and windows-friendly].

An executable locator (i.e. which or locate command) for windows that works!

Itch it scratches: there seems to be a lack of a "which" command for windows that actually work--they sometimes skip batch files entirely [batch file? what's that?] or don't list extensions, leaving you in doubt.  Despite running "which yyy" you never know what you're really running when you next run yyy in the command line--is it yyy.exe or some other yyy.bat that wasn't reported by "which"?  

Try it--you might really like it.

Usage:

   C:\>whichr ruby
   higher in the list will be executed first
   ./ruby.bat
   C:/Ruby/bin/ruby.exe
   c:/cygwin/bin/ruby.exe

   C:>whichr rub*
   higher in the list will be executed first
   c:/ruby/bin/rubigen
   c:/ruby/bin/rubigen.bat
   c:/ruby/bin/ruby.exe
   ...

Installation:

   C:\>gem install rogerdpack-whichr --source http://gems.github.com 
  
Enjoy.

Feedback welcome rogerdpack on github/gmail

Also Related:
http://github.com/Pistos/ruby-which discovers the location of installed ruby libraries, i.e. which gem folder they're in
C:\>rwhich ruby-which
c:/ruby/lib/ruby/gems/1.9.1/gems/Pistos-ruby-which-0.5.3/lib/ruby-which.rb

Except you don't actually need it since you have
$ gem which fileutils
/System/Library/Frameworks/Ruby.framework/Versions/1.8/usr/lib/ruby/1.8/fileutils.rb

Thanks Eric!