SYNOPSIS
[--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
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)
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
%
REPORTING BUGS
Security vulnerabilities should be reported via an email to Aq [email protected] Ns . 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.