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IRB(1)

Section: Misc. Reference Manual Pages ()
Updated: Ruby Programmers Reference Guide
Index Return to Main Contents

BSD mandoc
UNIX  

NAME

irb - Interactive Ruby Shell  

SYNOPSIS

[--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

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

 

OPTIONS

--version
Prints the version of .

-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. Suppresses --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 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 Aq security@ruby-lang.org Ns . 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-lang.org). Do not report security vulnerabilities via the system because it publishes the vulnerabilities immediately.

 

AUTHORS

Written by Keiju ISHITSUKA.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
ENVIRONMENT
FILES
EXAMPLES
SEE ALSO
REPORTING BUGS
AUTHORS


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