On Feb 1, 2008, at 1:49 AM, Une Bñ×ue wrote:

> I'm working (on Mac OS X) with two installed ruby (apart from Apple
> default one):
>
> $ which ruby
> /opt/local/bin/ruby
> $  which ruby19
> /opt/local/bin/ruby19
>
> (all of the Ruby-1.9.0-0 bins have a "19" suffix)
>
> when i try a simple script as :
> ----------------------------------------------------------------------
> #! /usr/bin/env ruby19
> require "appscript"
> include Appscript
>
> p app('Finder').home.folders.get
> ----------------------------------------------------------------------
>
> i get the following :
> ----------------------------------------------------------------------
> RubyMate r6354 running Ruby r1.9.0 (/opt/local/bin/ruby19)

Your question is about TextMate, not Ruby.  It's covered in TextMate's  anual.  See the "Important" paragraph in this section:

http://macromates.com/textmate/manual/shell_commands#search_path

Hope that helps.