A program , usually written in a scripting language or as a batch command, used to automatically finger stalk one or more persons. A sample stalk script might be something like this in Unix:
finger | grep -w -f .stalk
where .stalk is a list of the usernames you are stalking.
Most stalk scripts that I ever was privy to were simple command batches, like the one above (possibly with some additional options to grep to clear out false matches). Such a script could be added to your .login file to run on logon, so that every time you logged in you immediately knew which of your friends was also on (and so was available for fun with write, ytalk, or banner). More sophisticated scripts ran as daemons that would periodically update the user when someone logged on or off- functioning a bit like a crude buddy list.