Rails - Jun 2006 - RAILS_ROOT

Hello everybody:
I am new and i have a small problem with ruby. I want to execute an 
external program and I need to pass as an argument to that program a 
file of the system.
I''ve got that file in the public/files folder of my rails folder tree.
How can I know the path to where I have my rails project? I thought this 
would be with RAILS_ROOT but this variable is "script/../config/.." (I
have seen it with logger.debug("RAILS_ROOT is " +
"#{RAILS_ROOT}").

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