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 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.
- -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>
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 ⟨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.
