We recently gave you a brief history of viruses on the Mac and as requested by a user we wanted to give you a history of viruses on Linux. Given the tight security integrated into Linux, it is difficult to take advantage of a vulnerability on the computer, but some programmers have found ways around the security measures. There are several free options for anti-virus on Linux that you really should use, even if it isn't always running - a weekly or monthly scan doesn't hurt. Free anti-virus solutions include: ClamAV, AVG, Avast and F-Prot.