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bsd-family-tree revision 1.42.8.2
      1 The UNIX system family tree: Research and BSD
      2 ---------------------------------------------
      3 
      4 First Edition (V1)
      5      |
      6 Second Edition (V2)
      7      |
      8 Third Edition (V3)
      9      |
     10 Fourth Edition (V4)
     11      |
     12 Fifth Edition (V5)
     13      |
     14 Sixth Edition (V6) -----*
     15        \                |
     16         \               |
     17          \              |
     18 Seventh Edition (V7)    |
     19             \           |
     20              \        1BSD
     21              32V        |
     22                \      2BSD---------------*
     23                 \    /                   |
     24                  \  /                    |
     25                   \/                     |
     26                  3BSD                    |
     27                   |                      |
     28                4.0BSD                2.79BSD
     29                   |                      |
     30                4.1BSD --------------> 2.8BSD
     31                   |                      |
     32               4.1aBSD -----------\       |
     33                   |                \     |
     34               4.1bBSD                \   |
     35                   |                    \ |
     36       *------ 4.1cBSD --------------> 2.9BSD
     37      /            |                      |
     38 Eighth Edition    |                   2.9BSD-Seismo
     39      |            |                      |
     40      +----<--- 4.2BSD               2.9.1BSD
     41      |            |                      |
     42      +----<--- 4.3BSD -------------> 2.10BSD
     43      |            |               /      |
     44 Ninth Edition     |              / 2.10.1BSD
     45      |         4.3BSD Tahoe-----+        |
     46      |            |              \       |
     47      |            |                \     |
     48      v            |                  2.11BSD
     49 Tenth Edition     |                      |
     50                   |                  2.11BSD rev #430
     51                4.3BSD NET/1              |
     52                   |                      v
     53                4.3BSD Reno
     54                   |
     55    *---------- 4.3BSD NET/2 -------------------+-------------*
     56    |                    |                      |             |
     57 386BSD 0.0              |                      |           BSD/386 ALPHA
     58    |                    |                      |             |
     59 386BSD 0.1 ------------>+                      |           BSD/386 0.3.[13]
     60    |     \              |                  4.4BSD Alpha      |
     61    |     386BSD 1.0     |                      |           BSD/386 0.9.[34]
     62    |                    |                  4.4BSD            |
     63    |                    |                    / |             |
     64    |                    |   4.4BSD-Encumbered  |             |
     65    |                -NetBSD 0.8                |           BSD/386 1.0
     66    |               /    |                      |             |
     67 FreeBSD 1.0 <-----'  NetBSD 0.9                |           BSD/386 1.1
     68    |                    |           .----- 4.4BSD Lite       |
     69 FreeBSD 1.1             |          /   /       |     \       |
     70    |                    |         /   /        |      \      |
     71 FreeBSD 1.1.5       .---|--------'   /         |       \     |
     72    |               /    |           /          |        \    |
     73 FreeBSD 1.1.5.1   /     |          /           |         \   |
     74    |             /   NetBSD 1.0 <-'            |          \  |
     75    |            /       |                      |           \ |
     76 FreeBSD 2.0 <--'        |                      |           BSD/OS 2.0
     77    |                     \                     |             |
     78 FreeBSD 2.0.5             \                    |           BSD/OS 2.0.1
     79    |                 .-----\------------- 4.4BSD Lite2       |
     80    |                 |      \             |  |   |   |       |
     81    |                 | .-----|------Rhapsody |   |   |       |
     82    |                 | |     |        NetBSD 1.3 |   |       |
     83    |                 | |     |           OpenBSD 2.3 |       |
     84    |                 | |     |                BSD/OS 3.0     |
     85 FreeBSD 2.1          | |     |                               |
     86  |   |               | |  NetBSD 1.1 ------.               BSD/OS 2.1
     87  | FreeBSD 2.1.5     | |     |              \                |
     88  |     |             | |  NetBSD 1.2         \             BSD/OS 3.0
     89  | FreeBSD 2.1.6     | |     |  \          OpenBSD 2.0       |
     90  |     |             | |     |   \             |             |
     91  | FreeBSD 2.1.6.1   | |     |    \            |             |
     92  |     |             | |     |     \           |             |
     93  | FreeBSD 2.1.7     | |     |      |          |             |
     94  |     |             | |     |  NetBSD 1.2.1   |             |
     95  | FreeBSD 2.1.7.1   | |     |                 |             |
     96  |                   | |     |                 |             |
     97  |                   | |     |                 |             |
     98  *-FreeBSD 2.2       | |     |                 |             |
     99  |        \          | |     |                 |             |
    100  |     FreeBSD 2.2.1 | |     |                 |             |
    101  |         |         | |     |                 |             |
    102  |     FreeBSD 2.2.2 | |     |             OpenBSD 2.1       |
    103  |         |         | |     |                 |             |
    104  |     FreeBSD 2.2.5 | |     |                 |             |
    105  |         |         | |     |             OpenBSD 2.2       |
    106  |         |         | |  NetBSD 1.3           |             |
    107  |     FreeBSD 2.2.6 | |     |    |            |             |
    108  |         |         | |     | NetBSD 1.3.1    |           BSD/OS 3.1
    109  |         |         | |     |    |        OpenBSD 2.3       |
    110  |         |         | |     | NetBSD 1.3.2    |             |
    111  |     FreeBSD 2.2.7 | |     |    |            |             |
    112  |         |         | |     |    |            |           BSD/OS 4.0
    113  |         v         | |     |    |            |             |
    114  |     FreeBSD 2.2.8 | |     |    |            |             |
    115  |                   | |     |    |        OpenBSD 2.4       |
    116 FreeBSD 3.0 <--------* |     |    v            |             |
    117  |                     |     | NetBSD 1.3.3    |             |
    118  *---FreeBSD 3.1       |     |                 |             |
    119  |       |             |     |                 |           BSD/OS 4.0.1
    120  |   FreeBSD 3.2----*  |  NetBSD 1.4       OpenBSD 2.5       |
    121  |       |          |  |  |  |    |            |             |
    122  |       |          |  |  |  |    |            |             |
    123  |       |          |  |  |  |    |            |             |
    124  |   FreeBSD 3.3    |  |  |  | NetBSD 1.4.1    |             |
    125  |       |          |  |  |  |    |        OpenBSD 2.6       |
    126  |   FreeBSD 3.4    |  |  |  |    |            |             |
    127  |           |      |  |  |  |    |            |           BSD/OS 4.1
    128 FreeBSD 4.0  |      |  |  |  | NetBSD 1.4.2    |             |
    129  |           |      |  |  |  |    |            |             |
    130  |           |      |  |  |  |    |            |             |
    131  |   FreeBSD 3.5    |  |  |  |    |        OpenBSD 2.7       |
    132  |           |      |  |  |  |    |            |             |
    133  |   FreeBSD 3.5.1  |  |  |  |    |            |             |
    134  |                  |  |  |  |    |            |             |
    135  *---FreeBSD 4.1    |  |  |  |    |            |             |
    136  |      |           |  | (?) |    |            |             |
    137  |   FreeBSD 4.1.1  |  |  /  |    |            |             |
    138  |      |           |  | /   |    |            |             |
    139  |   FreeBSD 4.2   Darwin/   | NetBSD 1.4.3    |             |
    140  |      |         Mac OS X   |             OpenBSD 2.8     BSD/OS 4.2
    141  |      |             |      |                 |             |
    142  |      |             |      |                 |             |
    143  |      |           10.0  NetBSD 1.5           |             |
    144  |   FreeBSD 4.3      |      |    |            |             |
    145  |      |             |      |    |        OpenBSD 2.9       |
    146  |      |             |      | NetBSD 1.5.1    |             |
    147  |      |             |      |    |            |             |
    148  |   FreeBSD 4.4-.    |      | NetBSD 1.5.2    |             |
    149  |      |        | Mac OS X  |    |            |             |
    150  |      |        |   10.1    |    |        OpenBSD 3.0       |
    151  |   FreeBSD 4.5 |    |      |    |            |             |
    152  |      |         \   |      |    |            |           BSD/OS 4.3
    153  |   FreeBSD 4.6   \  |      |    |        OpenBSD 3.1       |
    154  |      |           \ |      | NetBSD 1.5.3    |             |
    155  |   FreeBSD 4.6.2 Mac OS X  |                 |             |
    156  |      |            10.2    |                 |             |
    157  |   FreeBSD 4.7      |      |                 |             |
    158  |      |             |   NetBSD 1.6       OpenBSD 3.2       |
    159  |   FreeBSD 4.8      |      |    |            |             |
    160  |      |             |      | NetBSD 1.6.1    |             |
    161  |      |--------.    |      |    |        OpenBSD 3.3     BSD/OS 5.0
    162  |      |         \   |      |    |            |             |
    163  |   FreeBSD 4.9   |  |      |    |        OpenBSD 3.4     BSD/OS 5.1 ISE
    164  |      |          |  |      |    |            |
    165  |      |          |  |      | NetBSD 1.6.2    |
    166  |      |          |  |      |    |            |
    167  |      |          |  |      |    |        OpenBSD 3.5
    168  |      |          |  |      |    v            |
    169  |   FreeBSD 4.10  |  |      |                 |
    170  |      |          |  |      |                 |
    171  |   FreeBSD 4.11  |  |      |                 |
    172  |                 |  |      |                 |
    173  |                  `-|------|-----------------|---------------------.
    174  |                    |      |                 |                      \
    175 FreeBSD 5.0           |      |                 |                       |
    176  |                    |      |                 |                       |
    177 FreeBSD 5.1           |      |                 |                 DragonFly 1.0
    178  |          \         |      |                 |                       |
    179  |           ----- Mac OS X  |                 |                       |
    180  |                   10.3    |                 |                       |
    181 FreeBSD 5.2           |      |                 |                       |
    182  |      |             |      |                 |                       |
    183  |   FreeBSD 5.2.1    |      |                 |                       |
    184  |                    |      |                 |                       |
    185  *-------FreeBSD 5.3  |      |                 |                       |
    186  |           |        |      |             OpenBSD 3.6                 |
    187  |           |        |   NetBSD 2.0           |                       |
    188  |           |        |      | |  |            |                DragonFly 1.2.0
    189  |           |     Mac OS X  | | NetBSD 2.0.2  |                       |
    190  |           |       10.4    | |  |            |                       |
    191  |       FreeBSD 5.4  |      | |  |            |                       |
    192  |           |        |      | |  |        OpenBSD 3.7                 |
    193  |           |        |      | | NetBSD 2.0.3  |                       |
    194  |           |        |      | |  |            |                       |
    195  *--FreeBSD  |        |      | |  v        OpenBSD 3.8                 |
    196  |    6.0    |        |      | |               |                       |
    197  |     |     |        |      |  \              |                       |
    198  |     |     |        |      | NetBSD 2.1      |                       |
    199  |     |     |        |      |                 |                       |
    200  |     |     |        |   NetBSD 3.0           |                       |
    201  |     |     |        |      | |  |            |                DragonFly 1.4.0
    202  |     |     |        |      | |  |        OpenBSD 3.9                 |
    203  |  FreeBSD  |        |      | |  |            |                       |
    204  |    6.1    |        |      | |  |            |                       |
    205  |     |  FreeBSD 5.5 |      | |  |            |                       |
    206  |     |              |      | | NetBSD 3.0.1  |                DragonFly 1.6.0
    207  |     |              |      | |  |            |                       |
    208  |     |              |      | |  |        OpenBSD 4.0                 |
    209  |     |              |      | | NetBSD 3.0.2  |                       |
    210  |     |              |      | NetBSD 3.1      |                       |
    211  | FreeBSD 6.2        |      |                 |                       |
    212  |     |              |      |                 |                DragonFly 1.8.0
    213  |     |              |      |             OpenBSD 4.1                 |
    214  |     |              |      |                 |                DragonFly 1.10.0
    215  |     |           Mac OS X  |                 |                       |
    216  |     |             10.5    |                 |                       |
    217  |     |              |      |             OpenBSD 4.2                 |
    218  |     |              |   NetBSD 4.0           |                       |
    219  | FreeBSD 6.3        |      |    |            |                       |
    220  |            \       |      |    |            |                       |
    221  *--FreeBSD    |      |      |    |            |                DragonFly 1.12.0
    222  |    7.0      |      |      |    |            |                       |
    223  |     |       |      |      |    |        OpenBSD 4.3                 |
    224  |     |       |      |      | NetBSD 4.0.1    |                DragonFly 2.0.0
    225  |     |    FreeBSD   |      |             OpenBSD 4.4                 |
    226  |     |      6.4     |      |                 |                       |
    227  |     |              |      |                 |                       |
    228  |  FreeBSD 7.1       |      |                 |                       |
    229  |     |              |      |                 |                DragonFly 2.2.0
    230  |  FreeBSD 7.2       |   NetBSD 5.0       OpenBSD 4.5                 |
    231  |             \      |      | |    \          |                       |
    232  |              |  Mac OS X  | |     \         |                       |
    233  |              |    10.6    | |      \        |                       |
    234  |              |     |      | |   NetBSD      |                DragonFly 2.4.0
    235  |              |     |      | |    5.0.1  OpenBSD 4.6                 |
    236  |              |     |      | |       |       |                       |
    237  *--FreeBSD     |     |      | |       |       |                       |
    238  |    8.0       |     |      | |       |       |                       |
    239  |     |     FreeBSD  |      | |   NetBSD      |                       |
    240  |     |       7.3    |      | |    5.0.2      |                DragonFly 2.6.0
    241  |     |        |     |      | |           OpenBSD 4.7                 |
    242  |  FreeBSD     |     |      | |               |                       |
    243  |    8.1       |     |      | |               |                       |
    244  |     |        |     |      | |               |                DragonFly 2.8.2
    245  |     |        |     |      |  \          OpenBSD 4.8                 |
    246  |     |        |     |      |  NetBSD         |                       |
    247  |  FreeBSD  FreeBSD  |      |    5.1          |                       |
    248  |    8.2      7.4    |      |     |           |               DragonFly 2.10.1
    249  |     |              |      |     |       OpenBSD 4.9                 |
    250  |     `-----.     Mac OS X  |     |           |                       |
    251  |            \      10.7    |     |           |                       |
    252  |             |      |      |     |       OpenBSD 5.0                 |
    253  *--FreeBSD    |      |      |     |           |                       |
    254  |    9.0      |      |      |  NetBSD 5.1.2   |               DragonFly 3.0.1
    255  |     v    FreeBSD   |      |                 |                       |
    256  |            8.3     |      |             OpenBSD 5.1                 |
    257  |                 Mac OS X  |                 |                       |
    258  |                   10.8    |                 |                       |
    259  |                    |   NetBSD 6.0           |                       |
    260  |                    |      |                 |                       |
    261 FreeBSD 10 -current   |  NetBSD -current  OpenBSD -current             |
    262  |                    |      |                 |                       |
    263  v                    v      v                 v                       v
    264 
    265 Time
    266 ----------------
    267 
    268 Time tolerance +/- 6 months, depending on which book/article you read; if it
    269 was the announcement in Usenet or if it was available as tape.
    270 
    271 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
    272 	and John Quarterman. The Design and Implementation of
    273 	the 4.4BSD Operating System.
    274 [APL] Apple website [http://www.apple.com/macosx/]
    275 [BSDI] Berkeley Software Design, Inc.
    276 [DFB] DragonFlyBSD Project, The.
    277 [DOC] README, COPYRIGHT on tape.
    278 [FBD] FreeBSD Project, The.
    279 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
    280 	Volume 11, Info 4, April, 1987.
    281 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
    282 	comp.bugs.4bsd.ucb-fixes, June 15, 1988.
    283 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
    284 	Changes in the Kernel in 2.9BSD. Second Berkeley Software
    285 	Distribution UNIX Version 2.9, July, 1983.
    286 [NBD] NetBSD Project, The.
    287 [OBD] OpenBSD Project, The.
    288 [QCU] Salus, Peter H. A quarter century of UNIX.
    289 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
    290 [TUHS] The Unix Historical Society.  http://minnie.tuhs.org/Unix_History/.
    291 [USE] Usenet announcement.
    292 [WRS] Wind River Systems, Inc.
    293 [dmr] Dennis Ritchie, via E-Mail
    294 
    295 Multics                 1965
    296 UNIX                    Summer 1969
    297 				DEC PDP-7
    298 First   Edition         1971-11-03 [QCU]
    299 				DEC PDP-11/20, Assembler
    300 Second  Edition         1972-06-12 [QCU]
    301 				10 UNIX installations
    302 Third   Edition         1973-02-xx [QCU]
    303 				Pipes, 16 installations
    304 Fourth  Edition         1973-11-xx [QCU]
    305 				rewriting in C effected,
    306                                 above 30 installations
    307 Fifth   Edition         1974-06-xx [QCU]
    308 				above 50 installations
    309 Sixth   Edition         1975-05-xx [QCU]
    310 				port to DEC Vax
    311 Seventh Edition         1979-01-xx [QCU]
    312 				first portable UNIX
    313 Eighth  Edition         1985-02-xx [QCU]
    314 				VAX 11/750, VAX 11/780 [dmr]
    315 				descended from 4.1c BSD [dmr]
    316 				descended from 4.1 BSD [44B]
    317 			scooping-out and replacement of the character-device
    318 			and networking part by the streams mechanism
    319 
    320 Ninth   Edition         1986-09-xx [QCU]
    321 Tenth   Edition         1989-10-xx [QCU]
    322 
    323 1BSD                    late 1977
    324 			1978-03-09 [QCU]
    325 				PDP-11, Pascal, ex(1)
    326 				30 free copies of 1BSD sent out
    327 				35 tapes sold for 50 USD [QCU]
    328 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
    329 				75 2BSD tapes shipped
    330 2.79BSD			1980-04-xx [TUHS]
    331 2.8BSD			1981-07-xx [KSJ]
    332 
    333 2.8.1BSD		1982-01-xx [QCU]
    334 				set of performance improvements
    335 2.9BSD			1983-07-xx [KSJ]
    336 2.9.1BSD                1983-11-xx [TUHS]
    337 2.9BSD-Seismo		1985-08-xx [SMS]
    338 2.10BSD			1987-04-xx [KKK]
    339 2.10.1BSD		1989-01-xx [SMS]
    340 2.11BSD			1992-02-xx [SMS]
    341 2.11BSD rev #430	1999-12-13 [SMS]
    342 
    343 32V			1978-1[01]-xx [QCU]
    344 3BSD                    late 1979 [QCU] March 1980 [TUHS]
    345 				virtual memory, page replacement,
    346                         	demand paging
    347 4.0BSD                  1980-10-xx
    348 4.1BSD                  1981-07-08 [DOC]
    349 4.1aBSD                 1982-04-xx
    350 				alpha release, 100 sites, networking [44B]
    351 4.1bBSD				internal release, fast filesystem [44B]
    352 4.1cBSD                 late 1982
    353 				beta release, IPC [44B]
    354 4.2BSD                  1983-09-xx [QCU]
    355                         1983-08-03 [DOC]
    356 4.3BSD                  1986-06-xx [QCU]
    357 			1986-04-05 [KB], [DOC]
    358 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
    359 4.3BSD NET/1            1988-11-xx [QCU]
    360                         1989-01-01 [DOC]
    361 4.3BSD Reno             1990-06-29 [QCU], [DOC]
    362 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
    363 
    364 BSD/386 ALPHA		1991-12-xx [BSDI]
    365 				first code released to people outside BSDI
    366 386BSD 0.0              1992-02-xx [DOC]
    367 BSD/386 0.3.1	        1992-04-xx [BSDI] first ext. beta; B customers
    368 BSD/386 0.3.3		1992-06-xx [BSDI] first CDROM version
    369 386BSD 0.1              1992-07-28 [DOC]
    370 4.4BSD Alpha            1992-07-07
    371 BSD/386 0.9.3		1992-10-xx [BSDI]
    372 				first external gamma; G customers
    373 BSD/386 0.9.4		1992-12-xx [BSDI]
    374 				would have been 1.0 except for request
    375 				for preliminary injunction
    376 BSD/386 1.0 		1993-03-xx [BSDI]
    377 				injunction denied; first official release
    378 NetBSD 0.8              1993-04-20 [NBD]
    379 4.4BSD                  1993-06-01 [USE]
    380 NetBSD 0.9              1993-08-23 [NBD]
    381 FreeBSD 1.0		1993-11-01 [FBD]
    382 FreeBSD 1.0.2		1993-11-14 [FBD]
    383 				supersedes 1.0 13 days after release.
    384 BSD/386 1.1		1994-02-xx [BSDI]
    385 4.4BSD Lite             1994-03-01 [USE]
    386 FreeBSD 1.1		1994-05-07 [FBD]
    387 FreeBSD 1.1.5		1994-06-30 [FBD]
    388 FreeBSD 1.1.5.1		1994-07-05 [FBD]
    389 				supersedes 1.1.5 5 days after release.
    390 NetBSD 1.0              1994-10-26 [NBD]
    391 386BSD 1.0              1994-11-12 [USE]
    392 FreeBSD 2.0		1994-11-23 [FBD]
    393 BSD/OS 2.0		1995-01-xx [BSDI] 4.4 lite based
    394 FreeBSD 2.0.5		1995-06-10 [FBD]
    395 BSD/OS 2.0.1		1995-06-xx [BSDI]
    396 4.4BSD Lite Release 2	1995-06-xx [44B]
    397 				the true final distribution from the CSRG
    398 FreeBSD 2.1.0		1995-11-19 [FBD]
    399 NetBSD 1.1              1995-11-26 [NBD]
    400 BSD/OS 2.1		1996-01-xx [BSDI]
    401 FreeBSD 2.1.5		1996-07-14 [FBD]
    402 NetBSD 1.2              1996-10-04 [NBD]
    403 OpenBSD 2.0             1996-10-18 [OBD]
    404 FreeBSD 2.1.6		1996-11-16 [FBD]
    405 FreeBSD 2.1.6.1		1996-11-25 [FBD] (sendmail security release)
    406 Rhapsody		1997-xx-xx
    407 FreeBSD 2.1.7		1997-02-20 [FBD]
    408 BSD/OS 3.0		1997-02-xx [BSDI] 4.4 lite2 based
    409 FreeBSD 2.2.0		1997-03-16 [FBD]
    410 FreeBSD 2.2.1		1997-03-25 [FBD]
    411 FreeBSD 2.2.2		1997-05-16 [FBD]
    412 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
    413 OpenBSD 2.1             1997-06-01 [OBD]
    414 FreeBSD 2.2.5		1997-10-22 [FBD]
    415 OpenBSD 2.2             1997-12-01 [OBD]
    416 NetBSD 1.3              1998-01-04 [NBD]
    417 FreeBSD 2.2.6		1998-03-25 [FBD]
    418 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
    419 BSD/OS 3.1		1998-03-xx [BSDI]
    420 OpenBSD 2.3             1998-05-19 [OBD]
    421 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
    422 FreeBSD 2.2.7		1998-07-22 [FBD]
    423 BSD/OS 4.0		1998-08-xx [BSDI]
    424 				2-lock MP support, ELF executables
    425 FreeBSD 3.0		1998-10-16 [FBD]
    426 				FreeBSD-3.0 is a snapshot from -current,
    427 				while 3.1 and 3.2 are from 3.x-stable which
    428 				was branched quite some time after 3.0-release
    429 FreeBSD 2.2.8           1998-11-29 [FBD]
    430 OpenBSD 2.4             1998-12-01 [OBD]
    431 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
    432 FreeBSD 3.1		1999-02-15 [FBD]
    433 BSD/OS 4.0.1		1999-03-xx [BSDI]
    434 NetBSD 1.4              1999-05-12 [NBD]
    435 FreeBSD 3.2             1999-05-17 [FBD]
    436 OpenBSD 2.5             1999-05-19 [OBD]
    437 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
    438 FreeBSD 3.3             1999-09-17 [FBD]
    439 OpenBSD 2.6             1999-12-01 [OBD]
    440 FreeBSD 3.4             1999-12-20 [FBD]
    441 BSD/OS 4.1		1999-12-xx [BSDI]
    442 FreeBSD 4.0             2000-03-13 [FBD]
    443 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
    444 OpenBSD 2.7             2000-06-15 [OBD]
    445 FreeBSD 3.5		2000-06-24 [FBD]
    446 FreeBSD 4.1		2000-07-27 [FBD]
    447 FreeBSD 3.5.1		2000-07-28 [FBD]
    448 FreeBSD 4.1.1		2000-09-25 [FBD] (a network-only patch release)
    449 FreeBSD 4.2  		2000-11-21 [FBD]
    450 NetBSD 1.4.3		2000-11-25 [NBD] (patch release)
    451 BSD/OS 4.2		2000-11-29 [BSDI]
    452 OpenBSD 2.8		2000-12-01 [OBD]
    453 NetBSD 1.5              2000-12-06 [NBD]
    454 Mac OS X 10.0           2001-03-24 [APL]
    455 FreeBSD 4.3  		2001-04-20 [FBD]
    456 OpenBSD 2.9  		2001-06-01 [OBD]
    457 NetBSD 1.5.1		2001-07-11 [NBD] (patch release)
    458 NetBSD 1.5.2		2001-09-13 [NBD] (patch release)
    459 FreeBSD 4.4  		2001-09-18 [FBD]
    460 Mac OS X 10.1		2001-09-29 [APL]
    461 OpenBSD 3.0		2001-12-01 [OBD]
    462 FreeBSD 4.5  		2002-01-29 [FBD]
    463 BSD/OS 4.3		2002-03-14 [WRS]
    464 OpenBSD 3.1		2002-05-19 [OBD]
    465 FreeBSD 4.6  		2002-06-15 [FBD]
    466 NetBSD 1.5.3		2002-07-22 [NBD] (patch release)
    467 FreeBSD 4.6.2		2002-08-15 [FBD] (patch release)
    468 Mac OS X 10.2		2002-08-23 [APL]
    469 NetBSD 1.6		2002-09-14 [NBD]
    470 FreeBSD 4.7		2002-10-08 [FBD]
    471 OpenBSD 3.2		2002-11-01 [OBD]
    472 FreeBSD 5.0		2003-01-17 [FBD]
    473 				FreeBSD 5.0 is a separate branch off of
    474 				-current, similar to 3.0.
    475 FreeBSD 4.8		2003-04-03 [FBD]
    476 NetBSD 1.6.1		2003-04-21 [NBD] (patch release)
    477 OpenBSD 3.3		2003-05-01 [OBD]
    478 BSD/OS 5.0		2003-05-?? [WRS]
    479 FreeBSD 5.1		2003-06-09 [FBD]
    480 Mac OS X 10.3		2003-10-24 [APL]
    481 FreeBSD 4.9		2003-10-28 [FBD]
    482 BSD/OS 5.1 ISE		2003-10-?? [WRS] (final version)
    483 OpenBSD 3.4		2003-11-01 [OBD]
    484 FreeBSD 5.2		2004-01-12 [FBD]
    485 FreeBSD 5.2.1		2004-02-22 [FBD] (patch release)
    486 NetBSD 1.6.2		2004-03-01 [NBD] (patch release)
    487 OpenBSD 3.5		2004-04-01 [OBD]
    488 FreeBSD 4.10		2004-05-27 [FBD]
    489 DragonFly 1.0		2004-07-12 [DFB]
    490 OpenBSD 3.6		2004-10-29 [OBD]
    491 FreeBSD 5.3		2004-11-06 [FBD]
    492 NetBSD 2.0		2004-12-09 [NBD]
    493 FreeBSD 4.11		2005-01-25 [FBD]
    494 DragonFly 1.2.0		2005-04-08 [DFB]
    495 NetBSD 2.0.2		2005-04-14 [NBD] (security/critical release)
    496 Mac OS X 10.4		2005-04-29 [APL]
    497 FreeBSD 5.4		2005-05-09 [FBD]
    498 OpenBSD 3.7		2005-05-19 [OBD]
    499 NetBSD 2.0.3		2005-10-31 [NBD] (security/critical release)
    500 OpenBSD 3.8		2005-11-01 [OBD]
    501 FreeBSD 6.0		2005-11-01 [FBD]
    502 NetBSD 2.1		2005-11-02 [NBD]
    503 NetBSD 3.0		2005-12-23 [NBD]
    504 DragonFly 1.4.0		2006-01-08 [DFB]
    505 OpenBSD 3.9		2006-05-01 [OBD]
    506 FreeBSD 6.1		2006-05-08 [FBD]
    507 FreeBSD 5.5		2006-05-25 [FBD]
    508 NetBSD 3.0.1		2006-07-24 [NBD] (security/critical release)
    509 DragonFly 1.6.0		2006-07-24 [DFB]
    510 OpenBSD 4.0		2006-11-01 [OBD]
    511 NetBSD 3.0.2		2006-11-04 [NBD] (security/critical release)
    512 NetBSD 3.1		2006-11-04 [NBD]
    513 FreeBSD 6.2		2007-01-15 [FBD]
    514 DragonFly 1.8.0		2007-01-30 [DFB]
    515 OpenBSD 4.1		2007-05-01 [OBD]
    516 DragonFly 1.10.0	2007-08-06 [DFB]
    517 Mac OS X 10.5		2007-10-26 [APL]
    518 OpenBSD 4.2		2007-11-01 [OBD]
    519 NetBSD 4.0		2007-12-19 [NBD]
    520 FreeBSD 6.3		2008-01-18 [FBD]
    521 DragonFly 1.12.0	2008-02-26 [DFB]
    522 FreeBSD 7.0		2008-02-27 [FBD]
    523 OpenBSD 4.3		2008-05-01 [OBD]
    524 DragonFly 2.0.0		2008-07-21 [DFB]
    525 OpenBSD 4.4		2008-11-01 [OBD]
    526 FreeBSD 6.4		2008-11-28 [FBD]
    527 FreeBSD 7.1		2009-01-04 [FBD]
    528 DragonFly 2.2.0		2009-02-17 [DFB]
    529 NetBSD 5.0		2009-04-29 [NBD]
    530 OpenBSD 4.5		2009-05-01 [OBD]
    531 FreeBSD 7.2		2009-05-04 [FBD]
    532 Mac OS X 10.6		2009-06-08 [APL]
    533 NetBSD 5.0.1		2009-08-02 [NBD] (security/critical release)
    534 DragonFly 2.4.0		2009-09-16 [DFB]
    535 OpenBSD 4.6		2009-10-18 [OBD]
    536 FreeBSD 8.0		2009-11-26 [FBD]
    537 NetBSD 5.0.2		2010-02-12 [NBD] (security/critical release)
    538 FreeBSD 7.3		2010-03-23 [FBD]
    539 DragonFly 2.6.0		2010-03-28 [DFB]
    540 OpenBSD 4.7		2010-05-19 [OBD]
    541 FreeBSD 8.1		2010-07-24 [FBD]
    542 DragonFly 2.8.2		2010-10-30 [DFB]
    543 OpenBSD 4.8		2010-11-01 [OBD]
    544 NetBSD 5.1		2010-11-19 [NBD]
    545 FreeBSD 7.4		2011-02-24 [FBD]
    546 FreeBSD 8.2		2011-02-24 [FBD]
    547 DragonFly 2.10.1	2011-04-26 [DFB]
    548 OpenBSD 4.9		2011-05-01 [OBD]
    549 Mac OS X 10.7		2011-07-20 [APL]
    550 OpenBSD 5.0		2011-11-01 [OBD]
    551 FreeBSD 9.0		2012-01-12 [FBD]
    552 NetBSD 5.1.2		2012-02-02 [NBD] (security/critical release)
    553 DragonFly 3.0.1		2012-02-21 [DFB]
    554 FreeBSD 8.3		2012-04-18 [FBD]
    555 OpenBSD 5.1		2012-05-01 [OBD]
    556 Mac OS X 10.8		2012-07-25 [APL]
    557 NetBSD 6.0		2012-10-17 [NBD]
    558 
    559 Bibliography
    560 ------------------------
    561 
    562 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
    563 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
    564 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
    565 
    566 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
    567 Company, Inc., 1994. ISBN 0-201-54777-5
    568 
    569 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
    570 Quarterman. The Design and Implementation of the 4.4BSD Operating
    571 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
    572 
    573 McKusick, Marshall Kirk, George Neville-Neil. The Design and
    574 Implementation of the FreeBSD Operating System.
    575 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
    576 
    577 Doug McIlroy. Research Unix Reader.
    578 
    579 Michael G. Brown. The Role of BSD in the Development of Unix.
    580 Presented to the Tasmanian Unix Special Interest Group of the
    581 Australian Computer Society, Hobart, August 1993.
    582 
    583 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
    584 URL: http://www.byte.com/art/9410/sec8/art3.htm
    585 
    586 Andreas Klemm, Lars Kller. If you're going to San Francisco ...
    587 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
    588 
    589 BSD Release Announcements collection.
    590 URL: http://www.FreeBSD.org/releases/
    591 
    592 BSD Hypertext Man Pages
    593 URL: http://www.FreeBSD.org/cgi/man.cgi
    594 
    595 UNIX history graphing project
    596 URL: http://minnie.tuhs.org/Unix_History/index.html
    597 
    598 UNIX history
    599 URL: http://www.levenez.com/unix/
    600 
    601 James Howard: The BSD Family Tree
    602 URL: http://ezine.daemonnews.org/200104/bsd_family.html
    603 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
    604 
    605 
    606 Acknowledgments
    607 ---------------
    608 
    609 Josh Gilliam for suggestions, bug fixes, and finding very old
    610 original BSD announcements from Usenet or tapes.
    611 
    612 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
    613 
    614 --
    615 Copyright (c) 1997-2012 Wolfram Schneider <wosch (a] FreeBSD.ORG>
    616 URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree
    617 
    618 $FreeBSD$
    619