From: Marcin Raczkowski <mailing.mr@...>
Date: 2008-01-02T06:02:12+09:00
Subject: Re: create a irb like console for my program

my hack that i use for quick debugging on my programs is

require 'pp'

# do some setup

$stdout.write("# "); $stdout.flush
while line = gets
   pp eval(line)
   $stdout.write("\n# "); $stdout.flush
   # or
   # pp main_object.instance_eval(line)
end

problem is of course that you have to make all your commands one-liners, 
but aside from that it works like a charm