IRB(1)

NAME
irb - Interactive Ruby Shell

SYNOPSIS
irb [--version] [-dfUw] [-I directory] [-r library] [-E external[:internal]] [-W[level]] [--[no]inspect] [--[no]multiline] [--[no]singleline] [--[no]echo] [--[no]colorize] [--[no]autocomplete] [--[no]verbose] [--prompt mode] [--prompt-mode mode] [--inf-ruby-mode] [--simple-prompt] [--noprompt] [--tracer] [--back-trace-limit 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.

-w  Same as `ruby -w' .

-W  Same as `ruby -W' .

-h
--help
    Prints a summary of the options.

-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

--multiline
    Uses multiline editor module.

--nomultiline
    Doesn't use multiline editor module.

--singleline
    Uses singleline editor module.

--nosingleline
    Doesn't use singleline editor module.

--extra-doc-dir
    Add an extra doc dir for the doc dialog.

--echo
    Show result (default).

--noecho
    Don't show result.

--echo-on-assignment
    Show result on assignment.

--noecho-on-assignment
    Don't show result on assignment.

--truncate-echo-on-assignment
    Show truncated result on assignment (default).

--colorize
    Use colorization.

--nocolorize
    Don't use colorization.

--autocomplete
    Use autocompletion.

--noautocomplete
    Don't use autocompletion.

--verbose
    Show details.

--noverbose
    Don't show details.

--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 --multiline and --singleline.

--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.

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
    => :t
    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.

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

AUTHORS
Written by Keiju ISHITSUKA.