Ruby Tutorial
Ruby Tutorial for Beginners - Learning Ruby in simple and easy steps - A beginner's tutorial containing complete knowledge of Ruby Syntax Syntax, Classes, Variables, Comments, Loops, File, I/O, Functions, Objects, TK, Ranges, iterators, arrays, strings, methods, blocks, Exception, Multi-Threading, Hashes, Modules, LDAP, Web Services, Web Programming.
http://www.tutorialspoint.com/ruby/