Carlo E. Prelz wrote in post #1104616:
> Subject: How do you know what the main file in Ruby Projects is?
>   Date: sab 06 apr 13 03:30:06 +0900
>
> If you don't actually run the interpreter yourself, chances are you
> run a script that is made executable, and where the first line is
> something like:
>
> #!/usr/bin/ruby
>

this line is wrong, use
#!/usr/bin/env ruby

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