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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

Prints the version of irb.
external[
:internal
]
 
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.
path
Same as `ruby -I' . Specifies $LOAD_PATH directory
Same as `ruby -U' . Sets the default value for internal encodings (Encoding.default_internal) to UTF-8.
Same as `ruby -d' . Sets $DEBUG to true.
Suppresses read of ~/.irbrc.
 
Prints a summary of the options.
Bc mode (load mathn, fraction or matrix are available)
library
Same as `ruby -r'. Causes irb to load the library using require.
Uses `inspect' for output (default except for bc mode)
Doesn't use inspect for output
Uses Readline extension module.
Doesn't use Readline extension module.
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.
No prompt mode.
Displays trace for each execution of commands.
n
Displays backtrace top n and tail n. The default value is 16.
n
Sets internal debug level to n (not for popular use)

ENVIRONMENT

 
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 vulnerabilities via the system because it publishes the vulnerabilities immediately.

AUTHORS

Written by Keiju ISHITSUKA.
November 7, 2012 UNIX