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.)
b0291d4a76fe976aae9873a5039b4f8ff351c4f610e7b617251814bdc375a0c3