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IRB(1)                 Ruby Programmers Reference Guide                 IRB(1)
NAME
     irb -- Interactive Ruby Shell
SYNOPSIS
     irb [--version] [-dfm] [-I directory] [-r library] [--[no]inspect]
         [--[no]readline] [--prompt mode] [--prompt-mode mode]
         [--inf-ruby-mode] [--simple-prompt] [--noprompt] [--tracer]
         [--back-trace-limit n] [--irb_debug n] [--] [program_file]
         [argument ...]
DESCRIPTION
     irb is the REPL(read-eval-print loop) environment for Ruby programs.
OPTIONS
     --version      Prints the version of irb.
     -E external[:internal]
     --encoding external[:internal]
                    Same as `ruby -E' .  Specifies the default value(s) for
                    external encodings and internal encoding. Values should be
                    separated with colon (:).
                    You can omit the one for internal encodings, then the
                    value (Encoding.default_internal) will be nil.
     -I path        Same as `ruby -I' .  Specifies $LOAD_PATH directory
     -U             Same as `ruby -U' .  Sets the default value for internal
                    encodings (Encoding.default_internal) to UTF-8.
     -d             Same as `ruby -d' .  Sets $DEBUG to true.
     -f             Suppresses read of ~/.irbrc.
     -h
     --help         Prints a summary of the options.
     -m             Bc mode (load mathn, fraction or matrix are available)
     -r library     Same as `ruby -r'.  Causes irb to load the library using
                    require.
     --inspect      Uses `inspect' for output (default except for bc mode)
     --noinspect    Doesn't use inspect for output
     --readline     Uses Readline extension module.
     --noreadline   Doesn't use Readline extension module.
     --prompt mode
     --prompt-mode mode
                    Switch prompt mode. Pre-defined prompt modes are
                    `default', `simple', `xmp' and `inf-ruby'.
     --inf-ruby-mode
                    Uses prompt appropriate for inf-ruby-mode on emacs.  Sup-
                    presses --readline.
     --simple-prompt
                    Makes prompts simple.
     --noprompt     No prompt mode.
     --tracer       Displays trace for each execution of commands.
     --back-trace-limit n
                    Displays backtrace top n and tail n.  The default value is
                    16.
     --irb_debug n  Sets internal debug level to n (not for popular use)
ENVIRONMENT
     IRBRC
     Also irb depends on same variables as ruby(1).
FILES
     ~/.irbrc        Personal irb initialization.
EXAMPLES
           % irb
           irb(main):001:0> 1 + 1
           2
           irb(main):002:0> def t(x)
           irb(main):003:1> x+1
           irb(main):004:1> end
           => nil
           irb(main):005:0> t(3)
           => 4
           irb(main):006:0> if t(3) == 4
           irb(main):007:1> p :ok
           irb(main):008:1> end
           :ok
           => :ok
           irb(main):009:0> quit
           %
SEE ALSO
     ruby(1).
REPORTING BUGS
     Security vulnerabilities should be reported via an email to
     <security AT ruby-lang.org>.  Reported problems will be published after
     being fixed.
     And you can report other bugs and feature requests via the Ruby Issue
     Tracking System (http://bugs.ruby-lang.org).  Do not report security vul-
     nerabilities via the system because it publishes the vulnerabilities
     immediately.
AUTHORS
     Written by Keiju ISHITSUKA.
UNIX                           November 7, 2012                           UNIX