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-.\"Ruby is copyrighted by Yukihiro Matsumoto <matz@netlab.jp>.
-.Dd November 15, 2012
-.Dt IRB \&1 "Ruby Programmer's Reference Guide"
-.Os UNIX
-.Sh NAME
-.Nm irb
-.Nd Interactive Ruby Shell
-.Sh SYNOPSIS
-.Nm
-.Op Fl -version
-.Op Fl dfm
-.Op Fl I Ar directory
-.Op Fl r Ar library
-.Op Fl - Ns Oo no Oc Ns inspect
-.Op Fl - Ns Oo no Oc Ns readline
-.Op Fl -prompt Ar mode
-.Op Fl -prompt-mode Ar mode
-.Op Fl -inf-ruby-mode
-.Op Fl -simple-prompt
-.Op Fl -noprompt
-.Op Fl -tracer
-.Op Fl -back-trace-limit Ar n
-.Op Fl -irb_debug Ar n
-.Op Fl -
-.Op program_file
-.Op argument ...
-.Pp
-.Sh DESCRIPTION
-.Nm
-is the REPL(read-eval-print loop) environment for Ruby programs.
-.Pp
-.Sh OPTIONS
-.Bl -tag -width "1234567890123" -compact
-.Pp
-.It Fl -version
-Prints the version of
-.Nm .
-.Pp
-.It Fl E Ar external Ns Op : Ns Ar internal
-.It Fl -encoding Ar external Ns Op : Ns Ar internal
-Same as `ruby -E' .
-Specifies the default value(s) for external encodings and internal encoding. Values should be separated with colon (:).
-.Pp
-You can omit the one for internal encodings, then the value
-.Pf ( Li "Encoding.default_internal" ) will be nil.
-.Pp
-.It Fl I Ar path
-Same as `ruby -I' .
-Specifies
-.Li $LOAD_PATH
-directory
-.Pp
-.It Fl U
-Same as `ruby -U' .
-Sets the default value for internal encodings
-.Pf ( Li "Encoding.default_internal" ) to UTF-8.
-.Pp
-.It Fl d
-Same as `ruby -d' .
-Sets
-.Li $DEBUG
-to true.
-.Pp
-.It Fl f
-Suppresses read of
-.Pa ~/.irbrc .
-.Pp
-.It Fl h
-.It Fl -help
-Prints a summary of the options.
-.Pp
-.It Fl r Ar library
-Same as `ruby -r'.
-Causes irb to load the library using require.
-.Pp
-.It Fl -inspect
-Uses `inspect' for output (default except for bc mode)
-.Pp
-.It Fl -noinspect
-Doesn't use inspect for output
-.Pp
-.It Fl -readline
-Uses Readline extension module.
-.Pp
-.It Fl -noreadline
-Doesn't use Readline extension module.
-.Pp
-.It Fl -prompt Ar mode
-.It Fl -prompt-mode Ar mode
-Switch prompt mode. Pre-defined prompt modes are
-`default', `simple', `xmp' and `inf-ruby'.
-.Pp
-.It Fl -inf-ruby-mode
-Uses prompt appropriate for inf-ruby-mode on emacs.
-Suppresses --readline.
-.Pp
-.It Fl -simple-prompt
-Makes prompts simple.
-.Pp
-.It Fl -noprompt
-No prompt mode.
-.Pp
-.It Fl -tracer
-Displays trace for each execution of commands.
-.Pp
-.It Fl -back-trace-limit Ar n
-Displays backtrace top
-.Ar n
-and tail
-.Ar n Ns .
-The default value is 16.
-.Pp
-.It Fl -irb_debug Ar n
-Sets internal debug level to n (not for popular use)
-.Pp
-.El
-.Pp
-.Sh ENVIRONMENT
-.Bl -tag -compact
-.It Ev IRBRC
-.Pp
-.El
-.Pp
-Also
-.Nm
-depends on same variables as
-.Xr ruby 1 .
-.Pp
-.Sh FILES
-.Bl -tag -compact
-.It Pa ~/.irbrc
-Personal irb initialization.
-.Pp
-.El
-.Pp
-.Sh EXAMPLES
-.Dl % irb
-.Dl irb(main):001:0> Ic 1 + 1
-.Dl 2
-.Dl irb(main):002:0> Ic def t(x)
-.Dl irb(main):003:1> Ic   x+1
-.Dl irb(main):004:1> Ic end
-.Dl => :t
-.Dl irb(main):005:0> Ic t(3)
-.Dl => 4
-.Dl irb(main):006:0> Ic if t(3) == 4
-.Dl irb(main):007:1> Ic p :ok
-.Dl irb(main):008:1> Ic end
-.Dl :ok
-.Dl => :ok
-.Dl irb(main):009:0> Ic quit
-.Dl %
-.Pp
-.Sh SEE ALSO
-.Xr ruby 1 .
-.Pp
-.Sh REPORTING BUGS
-.Bl -bullet
-.It
-Security vulnerabilities should be reported via an email to
-.Mt security@ruby-lang.org .
-Reported problems will be published after being fixed.
-.Pp
-.It
-Other bugs and feature requests can be reported via the
-Ruby Issue Tracking System
-.Pq Lk https://bugs.ruby-lang.org/ .
-Do not report security vulnerabilities
-via this system because it publishes the vulnerabilities immediately.
-.El
-.Sh AUTHORS
-Written by Keiju ISHITSUKA.