Many UCC computers run variants of Unix. Most Unix-based operating systems are quite similar from a user's point of view. The following quote is from the Jargon File, as maintained by Eric S. Raymond, and should explain a little about where Unix came from:
:Unix:: /yoo'niks/ /n./ [In the authors' words, ''A weak pun on Multics''; very early on it was 'UNICS'] (also 'UNIX') An interactive time-sharing system invented in 1969 by Ken Thompson after Bell Labs left the Multics project, originally so he could play games on his scavenged PDP-7. Dennis Ritchie, the inventor of C, is considered a co-author of the system. The turning point in Unix's history came when it was reimplemented almost entirely in C during 1972-1974, making it the first source-portable OS. Unix subsequently underwent mutations and expansions at the hands of many different people, resulting in a uniquely flexible and developer-friendly environment. By 1991, Unix had become the most widely used multiuser general-purpose operating system in the world. Many people consider this the most important victory yet of hackerdom over industry opposition (but see Unix weenie and Unix conspiracy for an opposing point of view). See Version 7, BSD, USG Unix, Linux.
You can read more of the Jargon file by typing 'jargon keyword' at a shell prompt on mermaid.