irb3.1(1)

IRB(1) Ruby Programmer’s Reference Guide 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. UNIX August 11, 2019 IRB(1)