Tailbeep opens a file (-f), seeks to the end, and watches for a string (-s). If the string is found, a beep is sent to the specified tty (-t) device. You can also daemonize (-d) it. I wrote it so I could watch /var/log/messages for the DENY string (so I can tell if someone is trying to break into the firewall.)
You can download it from the following link: https://packetstormsecurity.com/files/download/11703/tailbeep-0.2.tar.gz
Source: https://packetstormsecurity.com/files/11703/tailbeep-0.2.tar.gz.html