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.\"Ruby is copyrighted by Yukihiro Matsumoto <matz@netlab.jp>. .Dd April 20, 2017 .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.