Another question.  The tutorial says:

>Save this file as ???ri20min.rb???, and run it as ???ruby ri20min.rb???.

and at the top of the file is the shebang:

#!/usr/bin/env ruby

If you run the program using 'ruby filename', do you need the shebang? 
I read something that said you only need the shebang if you want to 
execute programs using just the filename, e.g.:

$ HelloWorld.rb

also what does 'env' do?  I read the man pages on the env function, and 
I can't figure out what it does in the shebang.

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