4.2bsd

Berkeley Software Distribution
4.2BSD
Berkeley 4.2
Berkeley Unix
BSD
BSD Unix

   <operating system> (BSD) A family of {Unix} versions developed
   by {Bill Joy} and others at the {University of California at
   Berkeley}, originally for the {DEC} {VAX} and {PDP-11}
   computers, and subsequently ported to almost all modern
   general-purpose computers.  BSD Unix incorporates {paged}
   {virtual memory}, {TCP/IP} networking enhancements and many
   other features.

   BSD UNIX 4.0 was released on 1980-10-19.  The BSD versions
   (4.1, 4.2, and 4.3) and the commercial versions derived from
   them ({SunOS}, {ULTRIX}, {Mt. Xinu}, {Dynix}) held the
   technical lead in the Unix world until {AT&T}'s successful
   standardisation efforts after about 1986, and are still widely
   popular.

   See also {Berzerkeley}, {USG Unix}.

   (2005-01-20)