IRB

Section: Misc. Reference Manual Pages (\&1)
Updated: Ruby Programmer's Reference Guide
Page Index

BSD mandoc
UNIX  

NAME

irb - Interactive Ruby Shell  

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.

-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 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

 

AUTHORS

Written by Keiju ISHITSUKA.


 

Index

NAME
SYNOPSIS
DESCRIPTION
OPTIONS
ENVIRONMENT
FILES
EXAMPLES
SEE ALSO
REPORTING BUGS
AUTHORS
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