Aspro David Copeland explains, writing a command-line application that is self-documenting, robust, adaptable and forever useful is easier than you might think. 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, 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 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.
What you need
All you’ll need is Ruby, and the ability to install a few gems along the way.
Examples written for Ruby 1.9.2, but 1.8.7 should work just as well.
Table of Contents
Chapter 1. Have a Clear and Concise Purpose
Chapter 2. Be Easy to Use
Chapter 3. Be Helpful
Chapter 4. Play Well with Others
Chapter 5. Delight Casual Users
Chapter 6. Make Configuration Easy
Chapter 7. Distribute Painlessly
Chapter 8. Test, Test, Test
Chapter 9. Be Easy to Maintain
Chapter 10. Add Color, Formatting, and Interactivity
Appendix 1. Common Command-Line Gems and Libraries
Appendix 2. Bibliography
Paperback: 225 pages
Publisher: Pragmatic Bookshelf (March 2012)
File Size: 4.8 MiB