I recently stumbled upon a Ruby gem called HighLine that simplifies basic command line input/output via an ask method and supports validation, conversion, and multi-choices.
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HighLine is still handy for small scripts that need validation and simple menus. If you want something more modern for terminal prompts, the tty-prompt and related tty-* gems are worth a look, though HighLine’s ask API stays simpler for quick input loops.