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.TH IRB \&1 "Ruby Programmer's Reference Guide" "August 11, 2019" "UNIX" .SH NAME \fBirb\fP \- Interactive Ruby Shell .SH SYNOPSIS .br \fBirb\fP [\fB\--version\fP] [\fB\-dfUw\fP] [\fB\-I\fP \fIdirectory\fP] [\fB\-r\fP \fIlibrary\fP] [\fB\-E\fP \fIexternal\fP[:\fIinternal\fP]] [\fB\-W\fP[\fIlevel\fP]] [\fB\--\fP[no]inspect] [\fB\--\fP[no]multiline] [\fB\--\fP[no]singleline] [\fB\--\fP[no]echo] [\fB\--\fP[no]colorize] [\fB\--\fP[no]verbose] [\fB\--prompt\fP \fImode\fP] [\fB\--prompt-mode\fP \fImode\fP] [\fB\--inf-ruby-mode\fP] [\fB\--simple-prompt\fP] [\fB\--noprompt\fP] [\fB\--tracer\fP] [\fB\--back-trace-limit\fP \fIn\fP] [\fB\--\fP] [program_file] [argument ...] .SH DESCRIPTION \fBirb\fP is the REPL(read-eval-print loop) environment for Ruby programs. .SH OPTIONS .TP \fB\--version\fP Prints the version of \fB.\fP .TP \fB\-E\fP \fIexternal\fP[:\fIinternal\fP] .TP \fB\--encoding\fP \fIexternal\fP[:\fIinternal\fP] 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. .TP \fB\-I\fP \fIpath\fP Same as `ruby -I' . Specifies $LOAD_PATH directory .TP \fB\-U\fP Same as `ruby -U' . Sets the default value for internal encodings ("Encoding.default_internal") to UTF-8. .TP \fB\-d\fP Same as `ruby -d' . Sets $DEBUG to true. .TP \fB\-f\fP Suppresses read of \fI~/.irbrc\fP. .TP \fB\-w\fP Same as `ruby -w' . .TP \fB\-W\fP Same as `ruby -W' . .TP \fB\-h\fP .TP \fB\--help\fP Prints a summary of the options. .TP \fB\-r\fP \fIlibrary\fP Same as `ruby -r'. Causes irb to load the library using require. .TP \fB\--inspect\fP Uses `inspect' for output (default except for bc mode) .TP \fB\--noinspect\fP Doesn't use inspect for output .TP \fB\--multiline\fP Uses multiline editor module. .TP \fB\--nomultiline\fP Doesn't use multiline editor module. .TP \fB\--singleline\fP Uses singleline editor module. .TP \fB\--nosingleline\fP Doesn't use singleline editor module. .TP \fB\--echo\fP Show result(default). .TP \fB\--noecho\fP Don't show result. .TP \fB\--colorize\fP Use colorization. .TP \fB\--nocolorize\fP Don't use colorization. .TP \fB\--verbose\fP Show details. .TP \fB\--noverbose\fP Don't show details. .TP \fB\--prompt\fP \fImode\fP .TP \fB\--prompt-mode\fP \fImode\fP Switch prompt mode. Pre-defined prompt modes are `default', `simple', `xmp' and `inf-ruby'. .TP \fB\--inf-ruby-mode\fP Uses prompt appropriate for inf-ruby-mode on emacs. Suppresses --multiline and --singleline. .TP \fB\--simple-prompt\fP Makes prompts simple. .TP \fB\--noprompt\fP No prompt mode. .TP \fB\--tracer\fP Displays trace for each execution of commands. .TP \fB\--back-trace-limit\fP \fIn\fP Displays backtrace top \fIn\fP and tail \fIn\fP. The default value is 16. .SH ENVIRONMENT .TP .B IRBRC Also \fBirb\fP depends on same variables as \fBruby\fP(1). .SH FILES .TP .B ~/.irbrc Personal irb initialization. .SH EXAMPLES .nf \& % irb .fi .nf \& irb(main):001:0> \fB1 + 1\fP .fi .nf \& 2 .fi .nf \& irb(main):002:0> \fBdef t(x)\fP .fi .nf \& irb(main):003:1> \fBx + 1\fP .fi .nf \& irb(main):004:1> \fBend\fP .fi .nf \& => :t .fi .nf \& irb(main):005:0> \fBt(3)\fP .fi .nf \& => 4 .fi .nf \& irb(main):006:0> \fBif t(3) == 4\fP .fi .nf \& irb(main):007:1> \fBp :ok\fP .fi .nf \& irb(main):008:1> \fBend\fP .fi .nf \& :ok .fi .nf \& => :ok .fi .nf \& irb(main):009:0> \fBquit\fP .fi .nf \& % .fi .SH SEE ALSO \fBruby\fP(1). .SH REPORTING BUGS .IP \(bu Security vulnerabilities should be reported via an email to Mt security@ruby-lang.org. Reported problems will be published after being fixed. .IP \(bu Other bugs and feature requests can be reported via the Ruby Issue Tracking System (\fBhttps://bugs.ruby-lang.org/\fP). Do not report security vulnerabilities via this system because it publishes the vulnerabilities immediately. .SH AUTHORS Written by Keiju ISHITSUKA.