puts with format

gistfile1.rb

[STDOUT, STDERR].each do |io|
  io.instance_eval do
    def puts_with_format(*arg)
      print "[#{Time.now.strftime("%Y-%m-%d %H:%M:%S")} ##{$$}] "
      puts_without_format *arg
    end
    alias puts_without_format puts
    alias puts puts_with_format
  end
end