marc@ubuntu:~$ sudo tail -f /var/log/messages
Aug 22 15:40:18 ubuntu -- MARK --
Aug 22 16:00:18 ubuntu -- MARK --
Aug 22 16:20:18 ubuntu -- MARK --
Aug 22 16:40:19 ubuntu -- MARK --
Aug 22 17:00:19 ubuntu -- MARK --
Aug 22 17:20:20 ubuntu -- MARK --
Aug 22 17:40:20 ubuntu -- MARK --
Aug 22 18:00:21 ubuntu -- MARK --
Aug 22 18:20:21 ubuntu -- MARK --
Aug 22 18:40:22 ubuntu -- MARK --