Unix

• Originated as a research project in the AT&T Bell Labs in 1969
• Sixth edition, known as V6, released in 1976
  • First widely circulated release
  • Free for the universities
  • Led to two major flavors of Unix -- BSD and SYS V
• Version Seven (V7)
  • Released in 1979
  • Widely distributed to universities and research labs
• AT&T created Unix Support Group (USG), later known as Unix System Laboratories (USL)

• Berkeley Software Distribution
• Developed at the University of California, Berkeley
• First release in 1977
• Extended Unix by adding virtual memory support, C shell, job control, and TCP/IP networking
• Derivatives known as 4.2 BSD (1984), 4.3 BSD (1985), and 4.4 BSD (1993)
• One of the best known commercial derivative of BSD is SunOS

• Version 7 led to System III in 1982, System V.2 in 1984, and System V.3 in 1986
• System V.4 released in 1988
• Incorporated some features of BSD
• AT&T also joined forces with Sun (in 1988) to jointly develop future versions of System V

OSF Unix

• Open Software Foundation formed by IBM, DEC, HP, and other companies to jointly develop a non-AT&T dependent Unix
• Resulting product was named OSF/1
• Based on the Mach operating system developed at Carnegie-Mellon University
• Mach itself is a derivative of BSD
• OSF also gave other products such as motif and DCE (Distributed Computing Environment)

4.4 BSD-Lite

• Freely redistributable version of Unix
• The final version of Unix from the University of California, Berkeley