Coming from a c and python perspective, I'm amazed that you even can specify which ruby to run it with. Either its a compiled binary, or you call the interpreter with the code object as an argument. What is the design impetus for mixing scripting and executable styles this way?
Shebangs (#!) have been around for quite a long time. It's actually really handy to be able to write a script that you can execute as a command. See https://en.wikipedia.org/wiki/Shebang_(Unix)
