It's not actually a myth. There aren't very many UNIX-based operating systems in the hands of the average user, who is the prime target, since the users are the

It's not actually a myth. There aren't very many UNIX-based operating systems in the hands of the average user, who is the prime target, since the users are the biggest vulnerability in any system. UNIX isn't inherently secure to begin with, in fact initially security for UNIX was an afterthought. It wasn't until it started gaining widespread use that the UNIX developers started taking security seriously. I went through the transition from having encrypted passwords in the /etc/passwords file, which everyone could read (or no one could log in) to /etc/shadow as security started becoming important. That said, there was a virus around 8 years ago that specifically targeted a bunch of NCSA UNIX machines, and they ended up getting caught with their pants down -- there WAS a fix already available that would have blocked the virus, but the NCSA admins hadn't been diligent about installing it.