IRB

Introduction

IRB means “Interactive Ruby Shell”. Basically it lets you execute ruby commands in real time (like the normal shell does).

IRB is an indispensable tool when dealing with Ruby API. Works as classical rb script. Use it for short and easy commands.

One of the nice IRB functions is that when you press tab while typing a method it will give you an advice to what you can use (This is not an IntelliSense)

Parameters

Option | Details | —— | —— | -f | Suppress read of ~/.irbrc | -m | Bc mode (load mathn, fraction or matrix are available)|

|-d | Set $DEBUG to true (same as ruby -d')| |-r load-module | Same asruby -r’| |-I path | Specify $LOAD_PATH directory| |-U | Same as ruby -U| |-E enc | Same as ruby -E| |-w | Same as ruby -w| |-W[level=2] | Same as ruby -W| |–inspect | Use inspect' for output (default except for bc mode)| |--noinspect | Don't use inspect for output| |--readline | Use Readline extension module| |--noreadline | Don't use Readline extension module| |--prompt prompt-mode | Switch prompt mode. Pre-defined prompt modes aredefault’, simple',xmp’ and `inf-ruby’| |–inf-ruby-mode | Use prompt appropriate for inf-ruby-mode on emacs. Suppresses –readline.| |–simple-prompt | Simple prompt mode| |–noprompt | No prompt mode| |–tracer | Display trace for each execution of commands.| |–back-trace-limit n | Display backtrace top n and tail n. The default value is 16.| |–irb_debug n | Set internal debug level to n (not for popular use)| |-v, –version | Print the version of irb|