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- Unix is now well over 20 years old.
- It was developed and refined by Ken Thompson, Dennis Ritche et al.
at AT&T Bell Laboratories.
- Versions up to 7th Edition were made available to academic
institutions for a small price.
- After a large reorganisation of AT&T, Unix was commercially
marketed by Unix System Laboratories (USL), now owned by Novell.
- The University of California, Berkeley used Unix as a research system.
It also had a DARPA grant to develop and implement the Arpanet
protocols, which became TCP/IP.
- UCB distributed its changes to Unix to other owners of Unix.
These were known as the Berkeley Software Distributions.
- UCB added many features to Unix:
- Better memory management.
- Job control.
- A fast and robust file system.
- Networking (TCP/IP).
- By 1989, UCB had rewritten so much of the AT&T Unix code that only
5 -- 10% of the BSD Unix code was in fact original AT&T code.
- The non-AT&T code was released as the Net/2 distribution.
- Several people decided to rewrite the missing code from scratch.
Bill Jolitz completed the Net/2 code for the i386 PC platform, 386BSD,
and gave his code back to UCB.
- Similarly, Berkeley Software Design, Inc. (BSDI) completed the
Net/2 code for the i386 PC platform, using much of Bill's code.
- By now, AT&T were seriously concerned about the availability of
non-AT&T Unix clones.
- In 1992, AT&T brought an injunction against BSDI and UCB because they
believed the Net/2 distribution violated Unix trade secrets.
- After much legal wrangling, the issue was solved in February 1994,
after USL had been sold to Novell.
- UCB can freely distribute its latest BSD version, 4.4, with some files
removed. This is known as 4.4BSD-Lite.
- The perceived lack of support for 386BSD by Bill Jolitz lead two groups
to take 386BSD and maintain it. Thus, FreeBSD and NetBSD were born.
- The legal settlement has forced both camps to move to 4.4BSD-Lite as
the basis for their systems, which is better then Net/2 anyway.
Tue Sep 5 11:22:10 EST 1995