IRB(1) Ruby Programmer's Reference Guide IRB(1) 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]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. --echo Show result(default). --noecho Don't show result. --colorize Use colorization. --nocolorize Don't use colorization. --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 ruby(1). REPORTING BUGS o Security vulnerabilities should be reported via an email to security AT ruby-lang.org. Re- ported problems will be published after being fixed. o 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. UNIX August 11, 2019 UNIX
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