A high-level IO library that provides validation, type conversion, and more for command-line interfaces. HighLine also includes a complete menu system that can crank out anything from simple list selection to complete shells with just minutes of work.

A DSL for gathering options and parsing command line flags

Optimist is a commandline option parser for Ruby that just gets out of your way. One line of code per option is all you need to write. For that, you get a nice automatically-generated help page, robust option parsing, command subcompletion, and sensible defaults for everything you don't specify.

The complete solution for Ruby command-line executables. Commander bridges the gap between other terminal related libraries you know and love (OptionParser, HighLine), while providing many new features, and an elegant API.

Build command-suite CLI apps that are awesome. Bootstrap your app, add commands, options and documentation while maintaining a well-tested idiomatic command-line app

Trollop is a commandline option parser for Ruby that just gets out of your way. **DEPRECATION** This gem has been renamed to optimist and will no longer be supported. Please switch to optimist as soon as possible.

A simple mixin for CLI interfaces, including option parsing

Run shell commands safely, even with user-supplied values

Clamp provides an object-model for command-line utilities. It handles parsing of command-line options, and generation of usage help.

Choice is a simple little gem for easily defining and parsing command line options with a friendly DSL.

Common framework to build command line interfaces with Ruby

Isn't it awesome how `optparse` and other option parsers generate help and usage-messages based on your code?! Hell no! You know what's awesome? It's when the option parser *is* generated based on the help and usage-message that you write in a docstring! That's what docopt does!

Cri allows building easy-to-use command-line interfaces with support for subcommands.

Methadone provides a lot of small but useful features for developing a command-line app, including an opinionated bootstrapping process, some helpful cucumber steps, and some classes to bridge logging and output into a simple, unified, interface

cmdparse provides classes for parsing (possibly nested) commands on the command line; command line options themselves are parsed using optparse.

OptparsePlus provides a lot of small but useful features for developing a command-line app, including an opinionated bootstrapping process, some helpful integration test support, and some classes to bridge logging and output into a simple, unified, interface

A flexible command line option parser.

Writing even complex command-line apps should be quick, easy and fun. Escort takes the excellent Trollop option parser and adds a whole bunch of awesome features to produce a library you will always want to turn to when a 'quick script' is in order.

A modular Ruby toolkit for building clean, correct, and robust CLI commands as plain-old Ruby classes.

Clap is a small library that can be bundled with your command line application. It covers the simple case of executing code based on the flags or parameters passed.

OptionParser based CLI support for rapid CLI development in an object-oriented context. This library wraps Ruby's OptionParser for parsing your options under the hood, so you get all the goodness that the Ruby standard library provides. On top of that it adds a rich and powerful DSL for defining, validating, and normalizing options, as well as automatic and gorgeous help output (modeled after `gem --help`).

Parser for command line arguments, keywords, flags, options and environment variables.