Ruby/Language Basics/ri

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For information on a class method, type at a command line:

ri Hash::new
# or:
ri Hash::[]



For more information on an instance method, type something like:

ri Hash.keys
or:
ri Hash#keys



For more information on Hash, type this at a command line:

ri Hash



Read the document by package

Puts method of interest is part of the IO package
request that documentation by entering ri IO#puts at the command line:
 
C:\rubydev>ri IO#puts
---------------------------------------------------------------- IO#puts
     ios.puts(obj, ...)    => nil
------------------------------------------------------------------------
     Writes the given objects to _ios_ as with +IO#print+. Writes a
     record separator (typically a newline) after any that do not
     already end with a newline sequence. If called with an array



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