RI(1)                  Ruby Programmer's Reference Guide                 RI(1)

     ri -- Ruby API reference front end

     ri [-ahilTv] [-d DIRNAME] [-f FORMAT] [-w WIDTH] [--[no-]pager]
        [--server[=PORT]] [--[no-]list-doc-dirs] [--no-standard-docs]
        [--[no-]{system|site|gems|home}] [--[no-]profile] [--dump=CACHE]
        [name ...]

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

     ri is a part of Ruby.

     name can be:

           Class | Module | Module::Class

           Class::method | Class#method | Class.method | method

           gem_name: | gem_name:README | gem_name:History

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

     A '.' matches either class or instance methods, while #method matches
     only instance and ::method matches only class methods.

     README and other files may be displayed by prefixing them with the gem
     name they're contained in.  If the gem name is followed by a ':' all
     files in the gem will be shown.  The file name extension may be omitted
     where it is unambiguous.

     For example:

           ri Fil
           ri File
           ri File.new
           ri zip
           ri rdoc:README

     Note that shell quoting or escaping may be required for method names con-
     taining punctuation:

           ri 'Array.[]'
           ri compact\!

     To see the default directories ri will search, run:

           ri --list-doc-dirs

     Specifying the --system, --site, --home, --gems, or --doc-dir options
     will limit ri to searching only the specified directories.

     ri options may be set in the RI environment variable.

     The ri pager can be set with the RI_PAGER environment variable or the
     PAGER environment variable.

                    In interactive mode you can repeatedly look up methods
                    with autocomplete.

     --[no-]all     Show all documentation for a class or module.

     --[no-]list    List classes ri knows about.

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

     -T             Synonym for --no-pager.

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

                    Run RDoc server on the given port.  The default port
                    is 8214.

     -f FORMAT
                    Use the selected formatter.  The default formatter is bs
                    for paged output and ansi otherwise.  Valid formatters
                    are: ansi, bs, markdown, rdoc.

     --help         Show help and exit.

     --version      Output version information and exit.

     Data source options:

                    List the directories from which ri will source documenta-
                    tion on stdout and exit.

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

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

     --[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

     Debug options:

                    Run with the Ruby profiler.

     --dump=CACHE   Dump data from an ri cache or data file.

     RI           Options to prepend to those specified on the command-line.

     PAGER        Pager program to use for displaying.

     HOMEPATH     Path to the user's home directory.

     ~/.rdoc      Path for ri data in the user's home directory.

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

     o   Security vulnerabilities should be reported via an email to
         security@ruby-lang.org.  Reported problems will be published after
         being fixed.

     o   Other bugs and feature requests can be reported via the Ruby Issue
         Tracking System (https://bugs.ruby-lang.org/).  Do not report secu-
         rity vulnerabilities via this system because it publishes the vulner-
         abilities immediately.

     Written by Dave Thomas <dave@pragmaticprogrammer.com>.

UNIX                            April 20, 2017                            UNIX

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