By David B. Copeland
Speak on to your method. With its easy instructions, flags, and parameters, a well-formed command-line program is the fastest solution to automate a backup, a construct, or a deployment and simplify your life.
As Ruby seasoned David Copeland explains, writing a command-line software that's self-documenting, strong, adaptable and without end precious is less complicated than it's possible you'll imagine. Ruby is especially fitted to this activity, because it combines high-level abstractions with "close to the steel" method interplay wrapped up in a concise, readable syntax. additionally, Ruby has the aid of a wealthy environment of open-source instruments and libraries.
Ten insightful chapters every one clarify and show a command-line top perform. you will see find out how to use those instruments to raise the lowliest automation script to a maintainable, polished program.
You'll use loose, open resource parsers to create straightforward command-line interfaces in addition to command suites. you will see tips on how to use defaults to maintain concepts basic for daily clients, whereas giving complex clients concepts for extra advanced initiatives.
There's no cause a command-line software may still lack documentation, no matter if it is a part of a aid command or a guy web page; you can find out whilst and the way to exploit either. Your trip from command-line beginner to seasoned ends with a glance at helpful techniques to checking out your apps, and comprises a few enjoyable recommendations for outside-the-box, colourful interfaces that may satisfaction your users.
With Ruby, the command line isn't really lifeless. lengthy reside the command line.
What You Need:
All you will have is Ruby, and the power to put in a couple of gemstones alongside the best way. Examples written for Ruby 1.9.2, yet 1.8.7 may still paintings simply as well.
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We didn’t contain that during the string given to desc; it’s an extra little bit of documentation the GLI derives for us once we use the default_value option to point out the default worth for a flag. be_helpful/todo/bin/todo desc "Path to the todo dossier" arg_name "todo_file" ➤ default_value "~/. todo. txt" flag :f default_value isn’t really for documentation; it permits us to specify the worth for a flag whilst the consumer omits it from the command line; which means the worth of global_options[:f] aren't nil; it is going to be ~/. todo. txt if the person omits -f on obtain from Wow! publication