# File lib/ohai/plugins/uptime.rb, line 33
  def collect_uptime(path)
    # kern.boottime: { sec = 1232765114, usec = 823118 } Fri Jan 23 18:45:14 2009
    so = shell_out("#{Ohai.abs_path(path)} kern.boottime")
    so.stdout.lines do |line|
      if line =~ /kern.boottime:\D+(\d+)/
        usec = Time.new.to_i - $1.to_i
        return [usec, seconds_to_human(usec)]
      end
    end
    return [nil, nil]
  end