# File lib/linux/sys/uptime.rb, line 68
    def self.uptime
      seconds = self.seconds
      days    = seconds / 86400
      seconds -= days * 86400
      hours   = seconds / 3600
      seconds -= hours * 3600
      minutes = seconds / 60
      seconds -= minutes * 60

      "#{days}:#{hours}:#{minutes}:#{seconds}"
    end