Introduction
The UNIX is an operating system basically developed in the year 1969 by a group of employees of AT&T. These employees comprised of, Dennis Ritchie, Ken Thompson, Douglas McIlroy Brian Kernighan, Joe Ossanna and Michael Lesk. This operating system was developed in the assembly language. In the year 1973, this system had entirely been recorded in the famous C language, resultantly helping in the development of other hardware. The trademark of UNIX has been owned by a group known as Open Group. Only those systems which are fully yielding and certified as per Specification of Single UNIX system are eligible to ...