...System not use.?

Unix (officially trademarked as UNIX™) is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T employees at Bell Labs including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. Today's Unix systems are split into various branches, developed over time by AT&T, as well as various commercial vendors and non-profit organizations.The present owner of the trademark UNIX™ is The Open Group, an industry standards consortium. Only systems fully compliant with and certified to the Single UNIX Specification qualify as "UNIX™" (others are called "Unix system-like" or "Unix-like").During the late 1970s and early 1980s, Unix's influence in academic circles led to large-scale adoption (particularly of the BSD variant, originating from the University of California, Berkeley) of Unix by commercial startups, the most notable of which is Sun Microsystems. Today, in addition to certified Unix systems, Unix-like operating systems such as Linux, the Mac OS X and BSDs are commonly encountered.Sometimes, Traditional Unix may be used to describe a Unix or an operating system that has the characteristics of either Version 7 Unix or UNIX System V.

en.wikipedia.org

It is used just not by many home users its command lin based like dos, so its not user friendly

UNIX is not really a OS, It was never designed to allow multible drive access to the core system. This is why DOS was developed from UNIX. UNIX is a system interface not a Disk Operating System. While it is true that the Internet does run on UNIX, you have to understand the OSI layers and realize that UNIX operates in the Layer2 infrastructure which is a communication channel between the actual telecom equipment. This is why Linux was developed so that multible sources of data could be integrated into the core logic system communications.

well dah...the internet runs on unix or the homebrew linux.