Web Reference: Playing with Ruby code in interactive sessions like this is a terrific way to learn the language. Open up IRB (which stands for Interactive Ruby). If you’re using macOS open up Terminal and type irb, then hit enter. If you’re using Linux, open up a shell and type irb and hit enter. Feb 23, 2025 · In this article, we’ll build an interactive shell from the ground up, exploring /dev/tty, raw mode, and ANSI escape sequences to capture and process keystrokes instantly. IRB is pretty handy for quickly trying something out, and it is a great tool for exploring the language Ruby, and things that come built in. For example: $ irb > puts "Hello world!" Hello world! => nil > The first line starts the IRB program. Notice how the “prompt” indicator changes.
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