UNIX Family Tree? - (nf)

[ajs at hpfcla.UUCP]

#R:dartvax:-55400:hpfcla:43800002:000:1216
hpfcla!ajs    Jan  6 18:18:00 1984

Guess what I happened to just have laying around!  I hope it answers
your question, and that Mark doesn't mind me posting it.

>  From: cbosgd!mark (Mark Horton)
>  Date: 22 Jun 83 00:10:09 EDT (Wed)
>  
>  You asked why at "disappeared" from system III.
>  
>  At was never in System III or any of its  predecessors.  System  III did
>  not descend from V7 - you'll see many V7 features  that are not in SIII,
>  including mpx, learn, CBREAK, TIOCSETN.
>  
>  The lineology is (roughly):
>  
>        1976    1977     1978    1979     1980   1981      1982   1983
>  AT&T					     -------System III /- System V
>  					    /                 /
>  USG	      PWB 1.0 -> UNIX/TS 2.0 -> UNIX 3.0 -> 4.0 -> 5.0 -> 6.0
>  	   /
>  127	V6------------> V7
>  UCB               \       \--------------> 2.8BSD
>  		    \
>  135		     -> UNIX/32V
>  UCB		                \-----> 3BSD -> 4BSD
>  
>  There was considerable  cross-migration of V7 features into 2.0, such as
>  the Bourne shell and the V7 tty driver  (minus CBREAK and TIOCSETN)  and
>  environments,  but not a  wholesale  pickup of  everything.  All the PWB
>  descendents  allow  chown to give away  files (and thus have a buggy tar
>  command).
>  
>  	Mark