|--at&t (1969)-----\
| |
| v6 (1976)
| v7 (1979)
| novell owns at&t's unix (by 1994)
| _____________|____________________
| | | | | |
| aix irix sco hp-ux solaris 2.x
| (ibm) (sgi) (hp) (sun)
|
|--berkley (1977)-----\
| |
| 1bsd (1977)
unix-| |
| 4.4bsd (1993)
| net/2
| 4.4bsd-lite (by 1995)
| ________________|____________________________________
| | | | | | |
| sunos ultrix netbsd osf/1 nextstep mac os x
| (sun) (dec) (various) (dec) (next) (apple)
| (freebsd)
|--hybrids----\
|
linux (various)
|____________________________________________
| | | | | |
| redhat debian mandrake slackware s.u.s.e.
| (walnut creek)
|_____________________________________________
| | | | |
mklinux linuxppc turbolinux openlinux corellinux
(apple) (caldera) (corel)