As zcoyle said, it's bash. Why did you think it was Ruby when you correctly guessed it was a shell?

AFAIK, the closest in Ruby would be something like:

  for i in 1..10 do
    puts "This works too! Number " + i.to_s
  end

As for passwords, I boot directly into single-user mode and start the network manually. It's the only way to be sure.