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+= RI
+== Background
++ri+ is a tool that allows Ruby documentation to be viewed on the command-line.
+It is part of RDoc and is expected to work on any platform supported by Ruby.
+
++ri+ will be a bit slow the first time that it runs (or any time that the
+underlying documentation changes) because it builds a cache in the +.ri+
+directory within the user's home directory in order to make future accesses
+faster.
+
+== Usage
+To see information for a class, do:
+  ri class_name
+
+For example, for the +Array+ class, do
+  ri Array
+
+To see information for an instance method, do:
+  ri class_name#method_name
+
+For example, for Array's +join+ method, do:
+  ri Array#join
+
+To see information for a class method, do:
+  ri class_name.method_name
+
+For example, for Module's +private+ method, do:
+  ri Module.private
+
+To search for all methods containing +read+, do:
+  ri read
+
+To search for all methods starting with +read+, do:
+  ri '^read'
+
+To search for all +read+ methods, do:
+  ri '^read$'
+
+== Options
++ri+ supports a variety of options, all of which can be viewed via +--help+.
+Of particular interest, are:
+[-d directory]
+  List of directories from which to source documentation in addition to
+  the standard directories.  May be repeated.  This can be used to specify
+  the location of site-specific documentation (which can be generated with
+  RDoc).
+[-i]
+  This makes +ri+ go into interactive mode.  When +ri+ is in interactive mode,
+  it will allow the user to disambiguate lists of methods in case multiple
+  methods match against a method search string.  It also will allow the user
+  to enter in a method name (with auto-completion, if readline is supported)
+  when viewing a class.
+[-T]
+  Send output to stdout, rather than to a pager.
+
+All options also can be specified through the +RI+ environment variable.
+Command-line options always override those specified in the +RI+ environment
+variable.