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IRB(1)				 Ruby Programmers Reference Guide			   IRB(1)

     irb -- Interactive Ruby Shell

     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 ...]

     irb is the REPL(read-eval-print loop) environment for Ruby programs.

     --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.

     --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'.

		    Uses prompt appropriate for inf-ruby-mode on emacs.  Suppresses --readline.

		    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)


     Also irb depends on same variables as ruby(1).

     ~/.irbrc	     Personal irb initialization.

	   % irb
	   irb(main):001:0> 1 + 1
	   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
	   irb(main):009:0> quit


     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 vulnerabilities via the system because
     it publishes the vulnerabilities immediately.

     Written by Keiju ISHITSUKA.

UNIX					 November 7, 2012				     UNIX
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