From: brabuhr@...
Date: 2008-11-28T01:12:22+09:00
Subject: Re: Shebang! line not recognized in OS X Leopard??

On Thu, Nov 27, 2008 at 11:04 AM, Johnnie Lieske
<generic@frankenstein.com> wrote:
> Pinky:rubes pink$ matz.rb
> -bash: matz.rb: command not found

Assuming matz.rb is in your current directory, try:
    ./matz.rb

Did you already:
    chmod +x matz.rb
?