Praktische Erweiterungen für die irb:
require 'irb/completion'
require 'rubygems'
require 'map_by_method'
require 'what_methods'
require 'pp'
require 'irb/ext/save-history'
IRB.conf[:AUTO_INDENT] = true
IRB.conf[:PROMPT_MODE] = :SIMPLE
IRB.conf[:SAVE_HISTORY] = 200
IRB.conf[:HISTORY_FILE] = "#{ENV['HOME']}/.irb-history"
(via: fastjack)