I'm not a Mac user, but if I was this realy isn't something I'd be even remotely woried about. It's also a severe stretch to talk about this script as though it's a virus, it's realy nothing of the sort although I suppose it could be used as a payload in a trojan.

Scripts like this have existed for Unix for decades. Unix largely evolved in accademic institutions, breeding grounds for the most dedicated and imaginative hacker and cracker communities on earth, which is why unix security had to be so robust from day one. Yes such things exist, and yes it's right to point that out, be aware of it and take necessery precautions, but this anouncement is of little interest to anyone but conciensious sysadmins and security accademics, and it's probably not of much interest to most of them either.

Simon Hibbs