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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@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 15, 2012			  UNIX