Mr. Neighborly's Humble Little Ruby Book
by Jeremy McAnally
Number of pages: 147
Mr. Neighborly's Humble Little Ruby Book covers the Ruby language from the very basics of using puts to put naughty phrases on the screen all the way to serving up your favorite web page from WEBrick or connecting to your favorite web service. Written in a conversational narrative rather than like a dry reference book, Mr. Neighborly's Humble Little Ruby Book is an easy to read, easy to follow guide to all things Ruby.
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by Mark Slagell
Ruby is an easy object oriented language: it is designed to be easily read and written. This User's Guide will get you started at invoking and using ruby, and give you insights into ruby's nature that you may not get from the reference manual.
by Huw Collingbourne - No Starch Press
A comprehensive tutorial to the Ruby language. Each chapter is accompanied by ready-to-run source code for all the examples. There is also an Introduction which explains how to use the source code in Ruby In Steel or any other IDE of your choice.
by Chris Pine - Pragmatic Bookshelf
Pine teaches you how to program in Ruby with a minimum of fuss or bother. Starting with simple one-line programs, you'll see how to have your webpage send you email, to shuffle your music, to rename your photos from your digital camera, and more.
This book is a great collection of ideas, tricks, and skills that could be useful for Hackers. It's a unique extraction reference, summarizes a lot of research and experience. Rubyfu is a book to use not only to read, it's where ruby goes evil.