IRB
NAMESYNOPSIS
DESCRIPTION
OPTIONS
ENVIRONMENT
FILES
EXAMPLES
SEE ALSO
REPORTING BUGS
AUTHORS
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
−-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 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> tabs(1)
=> 4
irb(main):006:0> if tabs(1) == 4
irb(main):007:1> p :ok
irb(main):008:1> end
:ok
=> :ok
irb(main):009:0> quit
%
SEE ALSO
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.
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