HistoryOfUnix2 < Training2

%SECTION0{name=HistoryOfUnix2}% History of Unix: Unix spreads

   * In 1971 Unix was used at Bell Labs patent department for "word
     processing" (nroff(1))

   * It was usefull, so Ken and Dennis got a new toy:
     [[http://www-ipst.u-strasbg.fr/pat/internet/histinfo/pdp11-unix.jpeg][PDP-11]]

   * In 1974 Unix was introduced to the public

   * AT&T was allowed to enter the software business, so they licenced
     the source code.

   * Soon it was used at university OS classes

   * As source was available, Unix was improved and improvements were merged back again

   * Unix evolved fast and diversified.  ->
     AT&T Unix, *BSD* (Berkeley Unix), *Ultrix* (DEC), *AIX* (IBM),
     *Solaris* (Sun), *HP-UX* (HP), *Xenix* (Microsoft),
     etc. 
     [[http://www.levenez.com/unix/history.html][Unix family tree]]

4.1.1. History of Unix: Unix is born		1. Denx Training Topics		4.1.3. History of Unix: hard times
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