gistfile1.rb

#!/usr/bin/env ruby
require 'rubygems'        # if you use RubyGems
require 'daemons'

task1 = Daemons.call(:multiple => true) do
  loop {
    File.open("/tmp/daemon_test.log", "w") {|f| f.write(Time.now.to_s + "\n")}
    sleep 5
  }
end

puts task1.pid.pid
puts task1.pid

#ruby test.rb 
#nil
##<Daemons::PidMem:0x10a3d6818>