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RI(1)                  Ruby Programmers Reference Guide                  RI(1)

     ri - Ruby API reference front end

     ri [-Ti] [-d directory] [-f format] [--list-doc-dirs] [--no-standard-docs] [--[no-]{system|site|gems|home}]
        [--[no-]use-cache] [--width=width] [target ...]

     ri is a CUI front end for the Ruby API reference.  You can search and read API reference for classes and methods
     with ri.

     ri is a part of Ruby.

     target can be one of the following forms:

           Class  for classes

           Class::method  for class methods

           Class#method  for instance methods

           Class.method  for both class and instance methods

           method  for both class and instance methods

     All class names may be abbreviated to their minimum unambiguous form. If a name is ambiguous, all valid options
     will be listed.

     For example:

           ri Fil
           ri File
           ri zip

     Note that shell quoting may be required for method names containing punctuation:

           ri 'Array.[]'
           ri compact

     --version      Prints the version of ri.

     --no-pager     Send output directly to stdout, rather than to a pager.

     -d directory
                    List of directories from which to source documentation in addition to the standard directories.
                    May be repeated.

     -f FORMAT
     --fmt FORMAT
                    Format to use when displaying output:

                    Use 'bs' (backspace) with most pager programs. To use ANSI, either disable the pager or tell the
                    pager to allow control characters.

     --interactive  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.

                    List the directories from which ri will source documentation on stdout and exit.

                    Do not include documentation from the Ruby standard library, site_lib, installed gems, or ~/.rdoc.

                    Equivalent to specifying the options --no-system, --no-site, --no-gems, and --no-home.

     --[no-]system  Include documentation from Ruby's standard library.  Defaults to true.

     --[no-]site     Include documentation from libraries installed in site_lib. Defaults to true.

     --[no-]gems    Include documentation from RubyGems. Defaults to true.

     --[no-]home    Include documentation stored in ~/.rdoc.  Defaults to true.

                    Whether or not to use ri's cache. True by default.

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

     RI           Additional options.

     PAGER        Used as the name of pager program for displaying.

     HOMEPATH     Path to user's home directory.

     ~/.ri        Caches recently referenced documents here.

     ~/.rdoc      Searches user-wide documents here.

     ruby(1) rdoc(1) gem(1)

     Security vulnerabilities should be reported via an email to <>.  Reported problems will be
     published after fixed.

     And you can report other bugs and feature requests via the Ruby Issue Tracking System (http://redmine.ruby-  Do not report security vulnerabilities via the system because it publishes the vulnerabilities imme-

     Written by Dave Thomas <>

UNIX                           February 25, 2018                          UNIX