NAME
irb – Interactive Ruby Shell
SYNOPSIS
irb [--version] [-dfUw] [-I directory] [-r library] [-E external[:internal]] [-W[level]] [--[no]inspect] [--[no]multiline] [--[no]singleline] [--[no]echo] [--[no]colorize] [--[no]autocomplete] [--[no]verbose] [--prompt mode] [--prompt-mode mode] [--inf-ruby-mode] [--simple-prompt] [--noprompt] [--tracer] [--back-trace-limit 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.
- -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.
- --extra-doc-dir
-
Add an extra doc dir for the doc dialog.
- --echo
-
Show result (default).
- --noecho
-
Don't show result.
- --echo-on-assignment
-
Show result on assignment.
- --noecho-on-assignment
-
Don't show result on assignment.
- --truncate-echo-on-assignment
-
Show truncated result on assignment (default).
- --colorize
-
Use colorization.
- --nocolorize
-
Don't use colorization.
- --autocomplete
-
Use autocompletion.
- --noautocomplete
-
Don't use autocompletion.
- --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 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
=> :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
REPORTING BUGS
-
Security vulnerabilities should be reported via an email to [email protected]. Reported problems will be published after being fixed.
-
Other bugs and feature requests can be reported via the Ruby Issue Tracking System (https://bugs.ruby-lang.org/). Do not report security vulnerabilities via this system because it publishes the vulnerabilities immediately.
AUTHORS
Written by Keiju ISHITSUKA.