http://en.wikipedia.org/wiki/Computer_virus#The_vulnerability_of_operating_systems_to_viruses
While Linux, and Unix in general, has always natively blocked normal users from having access to make changes to the operating system environment, Windows users are generally not. This difference has continued partly due to the widespread use of administrator accounts in contemporary versions like XP. In 1997, when a virus for Linux was released – known as "Bliss" – leading antivirus vendors issued warnings that Unix-like systems could fall prey to viruses just like Windows.[31] The Bliss virus may be considered characteristic of viruses – as opposed to worms – on Unix systems. Bliss requires that the user run it explicitly, and it can only infect programs that the user has the access to modify. Unlike Windows users, most Unix users do not log in as an administrator user except to install or configure software; as a result, even if a user ran the virus, it could not harm their operating system. The Bliss virus never became widespread, and remains chiefly a research curiosity. Its creator later posted the source code to Usenet, allowing researchers to see how it worked.[32] -- FOSS Nepal mailing list: [email protected] http://groups.google.com/group/foss-nepal To unsubscribe, e-mail: [email protected] Mailing List Guidelines: http://wiki.fossnepal.org/index.php?title=Mailing_List_Guidelines Community website: http://www.fossnepal.org/
