How do I reboot my UNIX system?

Guardian 452 and defender of Mainframe from both internal and external threats. Bob is often criticised by other Guardians for his unorthodox views regarding viruses: unlike other Guardians, who believe that viruses should simply be deleted on sight, Bob theorizes that viruses can be reprogrammed to live as Sprites. Despite this criticism, Bob is still respected as one of the finest Guardians ever to come out of the academy. Compared to Dot, he usually does things "on the fly", and is an extremely casual and laid-back hero in the first two seasons. After living and partially degrading in the harsh Web (under the alias Interface), he became slightly more cautious. Despite their difference in personality, he and Dot developed romantic tension that finally resulted in them coupling at the end of Season 3.