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irb — Interactive Ruby Shell


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 ...]


irb is the REPL(read-eval-print loop) environment for Ruby programs.


--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.

--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'.

Uses prompt appropriate for inf-ruby-mode on emacs. Suppresses --readline.

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)



Also irb depends on same variables as ruby(1).

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