ri1.9.1 [options] [names...]

       ri1.9.1  displaies  information  on Ruby classes, modules, and methods.
       You can give the names of classes or methods to  see  their  documenta-
       tion.   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

       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:
           ri1.9.1 File
           ri1.9.1 File.new
           ri1.9.1 F.n
           ri1.9.1 zip

       Note  that  shell  quoting  may be required for method names containing
           ri1.9.1 'Array.[]'
           ri1.9.1 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 ri1.9.1.

       --help, -h
              Display help.
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