The UNIX system family tree
-------------------------------------------------------------------------------
First Edition (V1)
|
Second Edition (V2)
|
Third Edition (V3)
|
Fourth Edition (V4)
|
Fifth Edition (V5)
|
Sixth Edition (V6) ---------------------*
/ \ |
/ \ |
/ \ |
Seventh Edition (V7) |
/ \ |
/ \ 1BSD
SYSTEM I--------------* *--------------32V |
| \ 2BSD---------------*
SYSTEM II \ / |
| \ / |
SYSTEM III \/ |
| 3BSD |
SYSTEM IV | |
| ...................... 4.0BSD 2.7.9BSD
Mach 2 <---------------- SYSTEM V . | |
| | \ Sun OS 1 4.1BSD --------------> 2.8BSD
Mach 2.5 SVR I \ . | |
(SCO/MS) | | \ . 4.1aBSD -----------\ |
| | SVR II OSF/2 ....Sun OS 4.x | \ |
XENIX 1.0 | | | . 4.1bBSD \ |
| | SVR III | . | \ |
XENIX 2.0 | / | | . *------ 4.1cBSD --------------> 2.9BSD
| | / | | X / | |
SCO SVR 3.2 <-----|---+--------> SVR 3.2 | | . Eighth Edition | 2.9BSD-Seismo
| | | | | | . | | |
SCO OpenDesktop 2 | +------------+--> AT&T SVR 4 <----|----------------------------+----<--- 4.2BSD 2.9.1BSD
| | | | | . | | |
SCO OpenDesktop 3 | | + | . +----<--- 4.3BSD -------------> 2.10BSD
| | +--------|-----SVR 4.2----+---|--------+ | | / |
| | | | + | | | | | / |
SCO OpenServer 5 | Unixware2 AIX 3 | | | Solaris 2 Ninth Edition | / 2.10.1BSD
| | (Novell) (IBM) | | | | | 4.3BSD Tahoe-----+ |
| | | | O | | Solaris 2.x | | \ |
| | | | t | | | | | \ |
| | Unixware 7 AIX 4 h | | Solaris 7 v | 2.11BSD
| | (SCO) | e | | | Tenth Edition | |
| | | | r | | Solaris 8 | 2.11BSD rev #430
| | (SVR 5) | | | | | 4.3BSD NET/1 |
| | | | & | | Solaris 9EA | v
|---------------|----Unixware 8 | | | | 4.3BSD Reno
| | | | | | V |
OpenServer 5.06 | V | | V /*---------- 4.3BSD NET/2 -------------------+-------------*
| | | | Ultrix 4 <.................* | | | |
| | AIX 4.3.3 | (DEC) 386BSD 0.0 | | BSD/386 ALPHA
V | | | | | | | |
| | | Tru 64 5.x 386BSD 0.1 ------------>+ | BSD/386 0.3.[13]
| V | (Compaq)---> | \ | 4.4BSD Alpha |
| | | 386BSD 1.0 | | BSD/386 0.9.[34]
+ <...............................|..............................|....................|..................4.4BSD |
. | . | | / | |
Mach 3 (Base BSD) .....|............. | | 4.4BSD-Encumbered | |
. . | . | NetBSD 0.8 | BSD/386 1.0
. HP-UX 8 | IRIX 4.x | | | |
. ( HP ) | (SGI) FreeBSD 1.0 NetBSD 0.9 | BSD/386 1.1
........*.......... . | . | | .----- 4.4BSD Lite |
. . . | . FreeBSD 1.1 | / / | \ |
Gnu Hurd 0.1 NeXT HP-UX 9 | IRIX 5.x | | / / | \ |
. . . | . FreeBSD 1.1.5 .---|--------' / | \ |
. @ . | . | / | / | \ |
. + <- + ---------> + FreeBSD 1.1.5.1 / | / | \ |
Gnu Hurd 0.2 | | | / NetBSD 1.0 <-' | \ |
. HP-UX 10.x IRIX 6.0 | / | | \ |
. | | FreeBSD 2.0 <--' | | BSD/OS 2.0
Gnu Hurd (H2) | | | \ | |
. HP-UX 11.x IRIX 6.5.15 FreeBSD 2.0.5 \ | BSD/OS 2.0.1
. | | | .-----\------------- 4.4BSD Lite2 |
. | | | | \ | | | | |
V V V | | .-----|------Rhapsody | | | |
| | | | NetBSD 1.3 | | |
| | | | OpenBSD 2.3 | |
| | | | BSD/OS 3.0 |
FreeBSD 2.1 | | | |
| | | | NetBSD 1.1 ------. BSD/OS 2.1
| FreeBSD 2.1.5 | | | \ |
| | | | NetBSD 1.2 \ BSD/OS 3.0
| FreeBSD 2.1.6 | | | \ OpenBSD 2.0 |
| | | | | \ | |
| FreeBSD 2.1.6.1 | | | \ | |
| | | | | \ | |
| FreeBSD 2.1.7 | | | | | |
| | | | | NetBSD 1.2.1 | |
| FreeBSD 2.1.7.1 | | | | |
| | | | | |
| | | | | |
*-FreeBSD 2.2 | | | | |
| \ | | | | |
| FreeBSD 2.2.1 | | | | |
| | | | | | |
| FreeBSD 2.2.2 | | | OpenBSD 2.1 |
| | | | | | |
| FreeBSD 2.2.5 | | | | |
| | | | | OpenBSD 2.2 |
| | | | NetBSD 1.3 | |
| FreeBSD 2.2.6 | | | | | |
| | | | | NetBSD 1.3.1 | BSD/OS 3.1
| | | | | | OpenBSD 2.3 |
| | | | | NetBSD 1.3.2 | |
| FreeBSD 2.2.7 | | | | | |
| | | | | | | BSD/OS 4.0
| v | | | | | |
| FreeBSD 2.2.8 | | | | | |
| | | | | OpenBSD 2.4 |
FreeBSD 3.0 <--------* | | v | |
| | | NetBSD 1.3.3 | |
*---FreeBSD 3.1 | | | |
| | | | | BSD/OS 4.0.1 Linux 0.1
| FreeBSD 3.2----* | NetBSD 1.4 OpenBSD 2.5 | |
| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| FreeBSD 3.3 | | | | NetBSD 1.4.1 | | Linux 1.0
| | | | | | | OpenBSD 2.6 | | \
| FreeBSD 3.4 | | | | | | | | \
| | | | | | | | BSD/OS 4.1 Linux 1.0.x Linux 1.1.x
FreeBSD 4.0 | | | | | NetBSD 1.4.2 | | | |
| | | | | | | | | | |
| | | | | | | | | |.......+
| FreeBSD 3.5 | | | | | OpenBSD 2.7 | | .
| | | | | | | | | Linux 1.2.x .
| FreeBSD 3.5.1 | | | | | | | | \ .
| | | | | | | | | \.
*---FreeBSD 4.1 | | | | | | | | Linux 1.3.x
| | | | (?) | | | | | |
| FreeBSD 4.1.1 | | / | | | | | |
| | | | / | v | | |.......+
| FreeBSD 4.2 Darwin/ | NetBSD 1.4.3 | | | .
| | Mac OS X | OpenBSD 2.8 BSD/OS 4.2 Linux 2.0.x .
| | 10.0 NetBSD 1.5 | | | \ .
| FreeBSD 4.3 | | | | v | \.
| | | | v OpenBSD 2.9 | Linux 2.1.x
| | | | NetBSD 1.5.1 | | |
| | | | | | | |
| FreeBSD 4.4 | | NetBSD 1.5.2 | |.......+
| | | | | | .
| v | | | Linux 2.2.x .
| | | | | \ .
FreeBSD 5.0-current | NetBSD -current OpenBSD -current | \.
| | | | | Linux 2.3.x
v | v v | |
Mac OS X Linux 2.4.x +
10.1 | \.
2.4.17 2.5.2
The UNIX system family tree
-------------------------------------------------------------------------------
First Edition (V1)
|
Second Edition (V2)
|
Third Edition (V3)
|
Fourth Edition (V4)
|
Fifth Edition (V5)
|
Sixth Edition (V6) ---------------------*
/ \ |
/ \ |
/ \ |
Seventh Edition (V7) |
/ \ |
/ \ 1BSD
SYSTEM I--------------* *--------------32V |
| \ 2BSD---------------*
SYSTEM II \ / |
| \ / |
SYSTEM III \/ |
| 3BSD |
SYSTEM IV | |
| ...................... 4.0BSD 2.7.9BSD
Mach 2 <---------------- SYSTEM V . | |
| | \ Sun OS 1 4.1BSD --------------> 2.8BSD
Mach 2.5 SVR I \ . | |
(SCO/MS) | | \ . 4.1aBSD -----------\ |
| | SVR II OSF/2 ....Sun OS 4.x | \ |
XENIX 1.0 | | | . 4.1bBSD \ |
| | SVR III | . | \ |
XENIX 2.0 | / | | . *------ 4.1cBSD --------------> 2.9BSD
| | / | | X / | |
SCO SVR 3.2 <-----|---+--------> SVR 3.2 | | . Eighth Edition | 2.9BSD-Seismo
| | | | | | . | | |
SCO OpenDesktop 2 | +------------+--> AT&T SVR 4 <----|----------------------------+----<--- 4.2BSD 2.9.1BSD
| | | | | . | | |
SCO OpenDesktop 3 | | + | . +----<--- 4.3BSD -------------> 2.10BSD
| | +--------|-----SVR 4.2----+---|--------+ | | / |
| | | | + | | | | | / |
SCO OpenServer 5 | Unixware2 AIX 3 | | | Solaris 2 Ninth Edition | / 2.10.1BSD
| | (Novell) (IBM) | | | | | 4.3BSD Tahoe-----+ |
| | | | O | | Solaris 2.x | | \ |
| | | | t | | | | | \ |
| | Unixware 7 AIX 4 h | | Solaris 7 v | 2.11BSD
| | (SCO) | e | | | Tenth Edition | |
| | | | r | | Solaris 8 | 2.11BSD rev #430
| | (SVR 5) | | | | | 4.3BSD NET/1 |
| | | | & | | Solaris 9EA | v
|---------------|----Unixware 8 | | | | 4.3BSD Reno
| | | | | | V |
OpenServer 5.06 | V | | V /*---------- 4.3BSD NET/2 -------------------+-------------*
| | | | Ultrix 4 <.................* | | | |
| | AIX 4.3.3 | (DEC) 386BSD 0.0 | | BSD/386 ALPHA
V | | | | | | | |
| | | Tru 64 5.x 386BSD 0.1 ------------>+ | BSD/386 0.3.[13]
| V | (Compaq)---> | \ | 4.4BSD Alpha |
| | | 386BSD 1.0 | | BSD/386 0.9.[34]
+ <...............................|..............................|....................|..................4.4BSD |
. | . | | / | |
Mach 3 (Base BSD) .....|............. | | 4.4BSD-Encumbered | |
. . | . | NetBSD 0.8 | BSD/386 1.0
. HP-UX 8 | IRIX 4.x | | | |
. ( HP ) | (SGI) FreeBSD 1.0 NetBSD 0.9 | BSD/386 1.1
........*.......... . | . | | .----- 4.4BSD Lite |
. . . | . FreeBSD 1.1 | / / | \ |
Gnu Hurd 0.1 NeXT HP-UX 9 | IRIX 5.x | | / / | \ |
. . . | . FreeBSD 1.1.5 .---|--------' / | \ |
. @ . | . | / | / | \ |
. + <- + ---------> + FreeBSD 1.1.5.1 / | / | \ |
Gnu Hurd 0.2 | | | / NetBSD 1.0 <-' | \ |
. HP-UX 10.x IRIX 6.0 | / | | \ |
. | | FreeBSD 2.0 <--' | | BSD/OS 2.0
Gnu Hurd (H2) | | | \ | |
. HP-UX 11.x IRIX 6.5.15 FreeBSD 2.0.5 \ | BSD/OS 2.0.1
. | | | .-----\------------- 4.4BSD Lite2 |
. | | | | \ | | | | |
V V V | | .-----|------Rhapsody | | | |
| | | | NetBSD 1.3 | | |
| | | | OpenBSD 2.3 | |
| | | | BSD/OS 3.0 |
FreeBSD 2.1 | | | |
| | | | NetBSD 1.1 ------. BSD/OS 2.1
| FreeBSD 2.1.5 | | | \ |
| | | | NetBSD 1.2 \ BSD/OS 3.0
| FreeBSD 2.1.6 | | | \ OpenBSD 2.0 |
| | | | | \ | |
| FreeBSD 2.1.6.1 | | | \ | |
| | | | | \ | |
| FreeBSD 2.1.7 | | | | | |
| | | | | NetBSD 1.2.1 | |
| FreeBSD 2.1.7.1 | | | | |
| | | | | |
| | | | | |
*-FreeBSD 2.2 | | | | |
| \ | | | | |
| FreeBSD 2.2.1 | | | | |
| | | | | | |
| FreeBSD 2.2.2 | | | OpenBSD 2.1 |
| | | | | | |
| FreeBSD 2.2.5 | | | | |
| | | | | OpenBSD 2.2 |
| | | | NetBSD 1.3 | |
| FreeBSD 2.2.6 | | | | | |
| | | | | NetBSD 1.3.1 | BSD/OS 3.1
| | | | | | OpenBSD 2.3 |
| | | | | NetBSD 1.3.2 | |
| FreeBSD 2.2.7 | | | | | |
| | | | | | | BSD/OS 4.0
| v | | | | | |
| FreeBSD 2.2.8 | | | | | |
| | | | | OpenBSD 2.4 |
FreeBSD 3.0 <--------* | | v | |
| | | NetBSD 1.3.3 | |
*---FreeBSD 3.1 | | | |
| | | | | BSD/OS 4.0.1 Linux 0.1
| FreeBSD 3.2----* | NetBSD 1.4 OpenBSD 2.5 | |
| | | | | | | | | |
| | | | | | | | | |
| | | | | | | | | |
| FreeBSD 3.3 | | | | NetBSD 1.4.1 | | Linux 1.0
| | | | | | | OpenBSD 2.6 | | \
| FreeBSD 3.4 | | | | | | | | \
| | | | | | | | BSD/OS 4.1 Linux 1.0.x Linux 1.1.x
FreeBSD 4.0 | | | | | NetBSD 1.4.2 | | | |
| | | | | | | | | | |
| | | | | | | | | |.......+
| FreeBSD 3.5 | | | | | OpenBSD 2.7 | | .
| | | | | | | | | Linux 1.2.x .
| FreeBSD 3.5.1 | | | | | | | | \ .
| | | | | | | | | \.
*---FreeBSD 4.1 | | | | | | | | Linux 1.3.x
| | | | (?) | | | | | |
| FreeBSD 4.1.1 | | / | | | | | |
| | | | / | v | | |.......+
| FreeBSD 4.2 Darwin/ | NetBSD 1.4.3 | | | .
| | Mac OS X | OpenBSD 2.8 BSD/OS 4.2 Linux 2.0.x .
| | 10.0 NetBSD 1.5 | | | \ .
| FreeBSD 4.3 | | | | v | \.
| | | | v OpenBSD 2.9 | Linux 2.1.x
| | | | NetBSD 1.5.1 | | |
| | | | | | | |
| FreeBSD 4.4 | | NetBSD 1.5.2 | |.......+
| | | | | | .
| v | | | Linux 2.2.x .
| | | | | \ .
FreeBSD 5.0-current | NetBSD -current OpenBSD -current | \.
| | | | | Linux 2.3.x
v | v v | |
Mac OS X Linux 2.4.x +
10.1 | \.
2.4.17 2.5.2