O in 1969, Unix was born, is bell LABS in the United States, Massachusetts institute of technology and general electric to jointly develop a

A new type of operating system, because with good stability and multi-user, multi-task model, is favored by the industry, as it comes to the disadvantages: poor portability,
O 1973, C language, on the Unix in the processing and coding, portability change

O in 1978, Unix branch, is a Unix system v, and the other is the BSD Unix

O in 1979, bell LABS found copyright business opportunity at this time, want to make a killing, stopped unveiled a Unix

Source code, and banned for college students to provide the original code, bell LABS announced on Unix product ownership,

O 1979-1992 the BSD fastest-growing

O AIX, HP - UX, Solaris belongs to the derived version of Unix system v

O Open (free) BSD belongs to BSD Unix derived version