irb2.7 (1) Linux Manual Page
UNIX
Name
irb – Interactive Ruby ShellSynopsis
[--version ] [-dfUw [-I directory ] ] [-r library ] [-E external [: internal ] ] [-W [level ] ] [-– [no inspect ] ] [-– [no multiline ] ] [-– [no singleline ] ] [-– [no echo ] ] [-– [no colorize ] ] [-– [no verbose ] ] [--prompt mode ] [--prompt-mode mode ] [--inf-ruby-mode ] [--simple-prompt ] [--noprompt ] [--tracer ] [--back-trace-limit 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
- -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.
- –echo
- Show result(default).
- –noecho
- Don’t show result.
- –colorize
- Use colorization.
- –nocolorize
- Don’t use colorization.
- –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 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 Mt security [at] 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 (Lk https://bugs.ruby-lang.org/ ) Do not report security vulnerabilities via this system because it publishes the vulnerabilities immediately.