use the ri tool: read the document : ri « Language Basics « Ruby

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Ruby » Language Basics » ri 
use the ri tool: read the document


Enter ri, followed by the item you want help with, such as the puts method:

C:\rubydev>ri puts

More than one method matched your request. You can refine
your search by asking for information on one of:

     IO#puts, Kernel#puts, Zlib::GzipWriter#puts

 
Related examples in the same category
1. Read the document by package
2. For more information on Hash, type this at a command line:
3. For information on a class method, type at a command line:
4. For more information on an instance method, type something like:
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