ri1.8 [options] [names...]

       ri1.8 displaies information on Ruby classes, modules, and methods.  You
       can give the names of classes or methods to  see  their  documentation.
       Partial  names may be given: if the names match more than one entity, a
       list will be shown, otherwise details on that entity will be displayed.

       Nested classes and modules can be specified using the normal Name::Name
       notation,  and instance methods can be distinguished from class methods
       using "." (or "#") instead of "::".

       For example:
           ri1.8 File
           ri1.8 File.new
           ri1.8 F.n
           ri1.8 zip

       Note that shell quoting may be required  for  method  names  containing
           ri1.8 'Array.[]'
           ri1.8 compact\!

       --classes, -c
              Display the names of classes and modules we know about.

       --doc-dir, -d dirname
              A  directory  to  search for documentation. If not specified, we
              search the standard rdoc/ri directories.

       --format, -f name
              Format to use when displaying output:  ansi,  bs,  html,  plain,
              simple.   Use 'bs' (backspace) with most pager programs.  To use
              ANSI, either also use the -T option, or tell your pager to allow
              control characters.  (for example using the -R option to less.)

       --list-names, -l
              List all the names known to RDoc, one per line.

       --no-pager, -T
              Send output directly to stdout.

       --width, -w width
              Set the width of the output.

       --version, -v
              Display the version of ri1.8.

       --help, -h
              Display help.
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