stats.rb

require "cool.io"

class MyStatWatcher < Coolio::StatWatcher

  def initialize(path, interval)
    super
  end

  def on_change
    puts path
  end

end

path      = ARGV[0] || "."
increment = ARGV[1] || 1

Cool.io::Loop.default.tap do |reactor|
  MyStatWatcher.new(path, increment).tap do |watcher|
    watcher.attach(reactor)
  end
end.run