Well, today I decide to get these scripts out. There are three files, you should only edit the config file and rename it. Put it in /etc or /home/user/etc. The other two can go anywhere, but be sure to complete the right parameters in the config file.
You can use it from the crontab by calling the main script. You can add a "test" parameter in the call to see which instances it has detected and where the alert log will be search. Instance detection is done through /etc/oratab.
Still they need some work, but they are functional. I've been testing it on HP-UX and Oracle 8.0.5, but it should work on any kourne shell *nix.