A GUI application isn't always the best solution: with its simple commands, flags, and parameters, a well-formed command-line application is the quickest way to automate a backup, a build, or a deployment and simplify your life.
In Build Awesome Command-Line Applications in Ruby, Ruby pro David Copeland explains how to write a command-line application that is self-documenting, robust, adaptable and forever useful. It's easier than you might think! Ruby is particularly suited to this task, since it combines high-level abstractions with "close to the metal" system interaction wrapped up in a concise, readable syntax. Moreover, Ruby has the support of a rich ecosystem of open-source tools and libraries...
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