Read Local File System

Does anyone know the best way to read the local file system from Rails?
Is this even possible?

If by local you mean the client's desktop pc file system, then no.

If you mean the local file system of the OS that is running rails, then yes.

http://www.ruby-doc.org/core/classes/File.html

I don't believe that's possible.
It would mean that a 'website' could read your HD, I'm not sure you
would want that.