Build Awesome Command-Line Applications in Ruby 2: Control Your Computer, Simplify Your Life (Paperback)

Speak directly to your system. 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. With this book, you'll learn specific ways to write command-line applications that are easy to use, deploy, and maintain, using a set of clear best practices and the Ruby programming language. This book is designed to make any programmer or system administrator more productive in their job. Now updated for Ruby 2.

Writing a command-line application that's self-documenting, robust, adaptable and forever useful is easier than you might think. Ruby is particularly suited to this task, because it combines high-level abstractions with "close to the metal" system interaction wrapped up in a concise, readable syntax. Plus, Ruby has the support of a rich ecosystem of open source tools and libraries.

Ten insightful chapters each explain and demonstrate a command-line best practice. You'll see how to use these tools to elevate the lowliest automation script to a maintainable, polished application. You'll learn how to use free, open source parsers to create user-friendly command-line interfaces as well as command suites. You'll see how to use defaults to keep options simple for everyday users, while giving advanced users options for more complex tasks. There's no reason why a command-line application should lack documentation, whether it's part of a help command or a man page; you'll find out when and how to use both. Your journey from command-line novice to pro ends with a look at valuable approaches to testing your apps, and includes some fun techniques for outside-the-box, colorful interfaces that will delight your users.

With Ruby, the command line is not dead. Long live the command line.

直接與您的系統對話。使用簡單的指令、標誌和參數，一個良好設計的命令行應用程式是自動備份、構建或部署並簡化您生活的最快方式。通過本書，您將學習撰寫易於使用、部署和維護的命令行應用程式的具體方法，並使用一套清晰的最佳實踐和Ruby編程語言。本書旨在使任何程序員或系統管理員在工作中更加高效。現已更新至Ruby 2版本。

撰寫一個自我記錄、堅固、適應性強且永遠有用的命令行應用程式比您想像的要容易。Ruby特別適合這項任務，因為它結合了高層次的抽象和簡潔易讀的語法，並提供了與系統交互的接口。此外，Ruby還擁有豐富的開源工具和庫的支持。

十個富有見地的章節分別解釋和演示了命令行的最佳實踐。您將了解如何使用這些工具將最低級的自動化腳本提升為易於維護、精緻的應用程式。您將學習如何使用免費的開源解析器創建用戶友好的命令行界面以及命令套件。您將看到如何使用默認值使選項對於日常用戶保持簡單，同時為高級用戶提供更複雜任務的選項。命令行應用程式不應該缺乏文檔，無論是作為幫助命令還是man頁面的一部分；您將了解何時以及如何使用這兩者。您從命令行新手到專業人士的旅程將以寶貴的測試方法結束，並包括一些為用戶提供驚喜的創新、豐富多彩界面的有趣技巧。

在Ruby的世界中，命令行並未消亡。命令行萬歲。