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).
f48d24516c0e62148cbb782e1cb62c1b16b0c0a4f5d49100f27fe7568d015b5a