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bsd-family-tree revision 1.44.2.2
      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          |                DragonFly 2.0.0
    225  |     |    FreeBSD   |      |  4.0.1      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      |               DragonFly 3.0.1
    255  |     |    FreeBSD   |      | |    5.1.2      |                       |
    256  |     |      8.3     |      | |           OpenBSD 5.1                 |
    257  |     |       |   Mac OS X  | `----.          |                       |
    258  |     |       |     10.8    |       \         |                       |
    259  |     |       |      |   NetBSD 6.0  |        |                       |
    260  |     |       |      |      | | |    |    OpenBSD 5.2         DragonFly 3.2.1
    261  |  FreeBSD    |      |      | | | NetBSD      |                       |
    262  |    9.1      |      |      | | |   5.2       |                       |
    263  |             |      |      | |  \            |                       |
    264  |             |      |      | |   NetBSD      |                       |
    265  |             |      |      | |    6.0.1      |                       |
    266  |             |      |      | |      |   OpenBSD 5.3          DragonFly 3.4.1
    267  |             |      |      | |   NetBSD      |                       |
    268  |             |      |      | |    6.0.2      |                       |
    269  |             |      |      | |               |                       |
    270  |             |      |      |  `-NetBSD 6.1   |                       |
    271  |          FreeBSD   |      |                 |                       |
    272  |            8.4     |      |                 |                       |
    273  |                    |      |                 |                       |
    274  |                    |      |                 |                       |
    275  |                    |      |                 |                       |
    276 FreeBSD 10 -current   |  NetBSD -current  OpenBSD -current             |
    277  |                    |      |                 |                       |
    278  v                    v      v                 v                       v
    279 
    280 Time
    281 ----------------
    282 
    283 Time tolerance +/- 6 months, depending on which book/article you read; if it
    284 was the announcement in Usenet or if it was available as tape.
    285 
    286 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
    287 	and John Quarterman. The Design and Implementation of
    288 	the 4.4BSD Operating System.
    289 [APL] Apple website [http://www.apple.com/macosx/]
    290 [BSDI] Berkeley Software Design, Inc.
    291 [DFB] DragonFlyBSD Project, The.
    292 [DOC] README, COPYRIGHT on tape.
    293 [FBD] FreeBSD Project, The.
    294 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
    295 	Volume 11, Info 4, April, 1987.
    296 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
    297 	comp.bugs.4bsd.ucb-fixes, June 15, 1988.
    298 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
    299 	Changes in the Kernel in 2.9BSD. Second Berkeley Software
    300 	Distribution UNIX Version 2.9, July, 1983.
    301 [NBD] NetBSD Project, The.
    302 [OBD] OpenBSD Project, The.
    303 [QCU] Salus, Peter H. A quarter century of UNIX.
    304 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
    305 [TUHS] The Unix Historical Society.  http://minnie.tuhs.org/Unix_History/.
    306 [USE] Usenet announcement.
    307 [WRS] Wind River Systems, Inc.
    308 [dmr] Dennis Ritchie, via E-Mail
    309 
    310 Multics                 1965
    311 UNIX                    Summer 1969
    312 				DEC PDP-7
    313 First   Edition         1971-11-03 [QCU]
    314 				DEC PDP-11/20, Assembler
    315 Second  Edition         1972-06-12 [QCU]
    316 				10 UNIX installations
    317 Third   Edition         1973-02-xx [QCU]
    318 				Pipes, 16 installations
    319 Fourth  Edition         1973-11-xx [QCU]
    320 				rewriting in C effected,
    321                                 above 30 installations
    322 Fifth   Edition         1974-06-xx [QCU]
    323 				above 50 installations
    324 Sixth   Edition         1975-05-xx [QCU]
    325 				port to DEC Vax
    326 Seventh Edition         1979-01-xx [QCU]
    327 				first portable UNIX
    328 Eighth  Edition         1985-02-xx [QCU]
    329 				VAX 11/750, VAX 11/780 [dmr]
    330 				descended from 4.1c BSD [dmr]
    331 				descended from 4.1 BSD [44B]
    332 			scooping-out and replacement of the character-device
    333 			and networking part by the streams mechanism
    334 
    335 Ninth   Edition         1986-09-xx [QCU]
    336 Tenth   Edition         1989-10-xx [QCU]
    337 
    338 1BSD                    late 1977
    339 			1978-03-09 [QCU]
    340 				PDP-11, Pascal, ex(1)
    341 				30 free copies of 1BSD sent out
    342 				35 tapes sold for 50 USD [QCU]
    343 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
    344 				75 2BSD tapes shipped
    345 2.79BSD			1980-04-xx [TUHS]
    346 2.8BSD			1981-07-xx [KSJ]
    347 
    348 2.8.1BSD		1982-01-xx [QCU]
    349 				set of performance improvements
    350 2.9BSD			1983-07-xx [KSJ]
    351 2.9.1BSD                1983-11-xx [TUHS]
    352 2.9BSD-Seismo		1985-08-xx [SMS]
    353 2.10BSD			1987-04-xx [KKK]
    354 2.10.1BSD		1989-01-xx [SMS]
    355 2.11BSD			1992-02-xx [SMS]
    356 2.11BSD rev #430	1999-12-13 [SMS]
    357 
    358 32V			1978-1[01]-xx [QCU]
    359 3BSD                    late 1979 [QCU] March 1980 [TUHS]
    360 				virtual memory, page replacement,
    361                         	demand paging
    362 4.0BSD                  1980-10-xx
    363 4.1BSD                  1981-07-08 [DOC]
    364 4.1aBSD                 1982-04-xx
    365 				alpha release, 100 sites, networking [44B]
    366 4.1bBSD				internal release, fast filesystem [44B]
    367 4.1cBSD                 late 1982
    368 				beta release, IPC [44B]
    369 4.2BSD                  1983-09-xx [QCU]
    370                         1983-08-03 [DOC]
    371 4.3BSD                  1986-06-xx [QCU]
    372 			1986-04-05 [KB], [DOC]
    373 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
    374 4.3BSD NET/1            1988-11-xx [QCU]
    375                         1989-01-01 [DOC]
    376 4.3BSD Reno             1990-06-29 [QCU], [DOC]
    377 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
    378 
    379 BSD/386 ALPHA		1991-12-xx [BSDI]
    380 				first code released to people outside BSDI
    381 386BSD 0.0              1992-02-xx [DOC]
    382 BSD/386 0.3.1	        1992-04-xx [BSDI] first ext. beta; B customers
    383 BSD/386 0.3.3		1992-06-xx [BSDI] first CDROM version
    384 386BSD 0.1              1992-07-28 [DOC]
    385 4.4BSD Alpha            1992-07-07
    386 BSD/386 0.9.3		1992-10-xx [BSDI]
    387 				first external gamma; G customers
    388 BSD/386 0.9.4		1992-12-xx [BSDI]
    389 				would have been 1.0 except for request
    390 				for preliminary injunction
    391 BSD/386 1.0 		1993-03-xx [BSDI]
    392 				injunction denied; first official release
    393 NetBSD 0.8              1993-04-20 [NBD]
    394 4.4BSD                  1993-06-01 [USE]
    395 NetBSD 0.9              1993-08-23 [NBD]
    396 FreeBSD 1.0		1993-11-01 [FBD]
    397 FreeBSD 1.0.2		1993-11-14 [FBD]
    398 				supersedes 1.0 13 days after release.
    399 BSD/386 1.1		1994-02-xx [BSDI]
    400 4.4BSD Lite             1994-03-01 [USE]
    401 FreeBSD 1.1		1994-05-07 [FBD]
    402 FreeBSD 1.1.5		1994-06-30 [FBD]
    403 FreeBSD 1.1.5.1		1994-07-05 [FBD]
    404 				supersedes 1.1.5 5 days after release.
    405 NetBSD 1.0              1994-10-26 [NBD]
    406 386BSD 1.0              1994-11-12 [USE]
    407 FreeBSD 2.0		1994-11-23 [FBD]
    408 BSD/OS 2.0		1995-01-xx [BSDI] 4.4 lite based
    409 FreeBSD 2.0.5		1995-06-10 [FBD]
    410 BSD/OS 2.0.1		1995-06-xx [BSDI]
    411 4.4BSD Lite Release 2	1995-06-xx [44B]
    412 				the true final distribution from the CSRG
    413 FreeBSD 2.1.0		1995-11-19 [FBD]
    414 NetBSD 1.1              1995-11-26 [NBD]
    415 BSD/OS 2.1		1996-01-xx [BSDI]
    416 FreeBSD 2.1.5		1996-07-14 [FBD]
    417 NetBSD 1.2              1996-10-04 [NBD]
    418 OpenBSD 2.0             1996-10-18 [OBD]
    419 FreeBSD 2.1.6		1996-11-16 [FBD]
    420 FreeBSD 2.1.6.1		1996-11-25 [FBD] (sendmail security release)
    421 Rhapsody		1997-xx-xx
    422 FreeBSD 2.1.7		1997-02-20 [FBD]
    423 BSD/OS 3.0		1997-02-xx [BSDI] 4.4 lite2 based
    424 FreeBSD 2.2.0		1997-03-16 [FBD]
    425 FreeBSD 2.2.1		1997-03-25 [FBD]
    426 FreeBSD 2.2.2		1997-05-16 [FBD]
    427 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
    428 OpenBSD 2.1             1997-06-01 [OBD]
    429 FreeBSD 2.2.5		1997-10-22 [FBD]
    430 OpenBSD 2.2             1997-12-01 [OBD]
    431 NetBSD 1.3              1998-01-04 [NBD]
    432 FreeBSD 2.2.6		1998-03-25 [FBD]
    433 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
    434 BSD/OS 3.1		1998-03-xx [BSDI]
    435 OpenBSD 2.3             1998-05-19 [OBD]
    436 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
    437 FreeBSD 2.2.7		1998-07-22 [FBD]
    438 BSD/OS 4.0		1998-08-xx [BSDI]
    439 				2-lock MP support, ELF executables
    440 FreeBSD 3.0		1998-10-16 [FBD]
    441 				FreeBSD-3.0 is a snapshot from -current,
    442 				while 3.1 and 3.2 are from 3.x-stable which
    443 				was branched quite some time after 3.0-release
    444 FreeBSD 2.2.8           1998-11-29 [FBD]
    445 OpenBSD 2.4             1998-12-01 [OBD]
    446 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
    447 FreeBSD 3.1		1999-02-15 [FBD]
    448 BSD/OS 4.0.1		1999-03-xx [BSDI]
    449 NetBSD 1.4              1999-05-12 [NBD]
    450 FreeBSD 3.2             1999-05-17 [FBD]
    451 OpenBSD 2.5             1999-05-19 [OBD]
    452 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
    453 FreeBSD 3.3             1999-09-17 [FBD]
    454 OpenBSD 2.6             1999-12-01 [OBD]
    455 FreeBSD 3.4             1999-12-20 [FBD]
    456 BSD/OS 4.1		1999-12-xx [BSDI]
    457 FreeBSD 4.0             2000-03-13 [FBD]
    458 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
    459 OpenBSD 2.7             2000-06-15 [OBD]
    460 FreeBSD 3.5		2000-06-24 [FBD]
    461 FreeBSD 4.1		2000-07-27 [FBD]
    462 FreeBSD 3.5.1		2000-07-28 [FBD]
    463 FreeBSD 4.1.1		2000-09-25 [FBD] (a network-only patch release)
    464 FreeBSD 4.2  		2000-11-21 [FBD]
    465 NetBSD 1.4.3		2000-11-25 [NBD] (patch release)
    466 BSD/OS 4.2		2000-11-29 [BSDI]
    467 OpenBSD 2.8		2000-12-01 [OBD]
    468 NetBSD 1.5              2000-12-06 [NBD]
    469 Mac OS X 10.0           2001-03-24 [APL]
    470 FreeBSD 4.3  		2001-04-20 [FBD]
    471 OpenBSD 2.9  		2001-06-01 [OBD]
    472 NetBSD 1.5.1		2001-07-11 [NBD] (patch release)
    473 NetBSD 1.5.2		2001-09-13 [NBD] (patch release)
    474 FreeBSD 4.4  		2001-09-18 [FBD]
    475 Mac OS X 10.1		2001-09-29 [APL]
    476 OpenBSD 3.0		2001-12-01 [OBD]
    477 FreeBSD 4.5  		2002-01-29 [FBD]
    478 BSD/OS 4.3		2002-03-14 [WRS]
    479 OpenBSD 3.1		2002-05-19 [OBD]
    480 FreeBSD 4.6  		2002-06-15 [FBD]
    481 NetBSD 1.5.3		2002-07-22 [NBD] (patch release)
    482 FreeBSD 4.6.2		2002-08-15 [FBD] (patch release)
    483 Mac OS X 10.2		2002-08-23 [APL]
    484 NetBSD 1.6		2002-09-14 [NBD]
    485 FreeBSD 4.7		2002-10-08 [FBD]
    486 OpenBSD 3.2		2002-11-01 [OBD]
    487 FreeBSD 5.0		2003-01-17 [FBD]
    488 				FreeBSD 5.0 is a separate branch off of
    489 				-current, similar to 3.0.
    490 FreeBSD 4.8		2003-04-03 [FBD]
    491 NetBSD 1.6.1		2003-04-21 [NBD] (patch release)
    492 OpenBSD 3.3		2003-05-01 [OBD]
    493 BSD/OS 5.0		2003-05-?? [WRS]
    494 FreeBSD 5.1		2003-06-09 [FBD]
    495 Mac OS X 10.3		2003-10-24 [APL]
    496 FreeBSD 4.9		2003-10-28 [FBD]
    497 BSD/OS 5.1 ISE		2003-10-?? [WRS] (final version)
    498 OpenBSD 3.4		2003-11-01 [OBD]
    499 FreeBSD 5.2		2004-01-12 [FBD]
    500 FreeBSD 5.2.1		2004-02-22 [FBD] (patch release)
    501 NetBSD 1.6.2		2004-03-01 [NBD] (patch release)
    502 OpenBSD 3.5		2004-04-01 [OBD]
    503 FreeBSD 4.10		2004-05-27 [FBD]
    504 DragonFly 1.0		2004-07-12 [DFB]
    505 OpenBSD 3.6		2004-10-29 [OBD]
    506 FreeBSD 5.3		2004-11-06 [FBD]
    507 NetBSD 2.0		2004-12-09 [NBD]
    508 FreeBSD 4.11		2005-01-25 [FBD]
    509 DragonFly 1.2.0		2005-04-08 [DFB]
    510 NetBSD 2.0.2		2005-04-14 [NBD] (security/critical release)
    511 Mac OS X 10.4		2005-04-29 [APL]
    512 FreeBSD 5.4		2005-05-09 [FBD]
    513 OpenBSD 3.7		2005-05-19 [OBD]
    514 NetBSD 2.0.3		2005-10-31 [NBD] (security/critical release)
    515 OpenBSD 3.8		2005-11-01 [OBD]
    516 FreeBSD 6.0		2005-11-01 [FBD]
    517 NetBSD 2.1		2005-11-02 [NBD]
    518 NetBSD 3.0		2005-12-23 [NBD]
    519 DragonFly 1.4.0		2006-01-08 [DFB]
    520 OpenBSD 3.9		2006-05-01 [OBD]
    521 FreeBSD 6.1		2006-05-08 [FBD]
    522 FreeBSD 5.5		2006-05-25 [FBD]
    523 NetBSD 3.0.1		2006-07-24 [NBD] (security/critical release)
    524 DragonFly 1.6.0		2006-07-24 [DFB]
    525 OpenBSD 4.0		2006-11-01 [OBD]
    526 NetBSD 3.0.2		2006-11-04 [NBD] (security/critical release)
    527 NetBSD 3.1		2006-11-04 [NBD]
    528 FreeBSD 6.2		2007-01-15 [FBD]
    529 DragonFly 1.8.0		2007-01-30 [DFB]
    530 OpenBSD 4.1		2007-05-01 [OBD]
    531 DragonFly 1.10.0	2007-08-06 [DFB]
    532 Mac OS X 10.5		2007-10-26 [APL]
    533 OpenBSD 4.2		2007-11-01 [OBD]
    534 NetBSD 4.0		2007-12-19 [NBD]
    535 FreeBSD 6.3		2008-01-18 [FBD]
    536 DragonFly 1.12.0	2008-02-26 [DFB]
    537 FreeBSD 7.0		2008-02-27 [FBD]
    538 OpenBSD 4.3		2008-05-01 [OBD]
    539 DragonFly 2.0.0		2008-07-21 [DFB]
    540 OpenBSD 4.4		2008-11-01 [OBD]
    541 FreeBSD 6.4		2008-11-28 [FBD]
    542 FreeBSD 7.1		2009-01-04 [FBD]
    543 DragonFly 2.2.0		2009-02-17 [DFB]
    544 NetBSD 5.0		2009-04-29 [NBD]
    545 OpenBSD 4.5		2009-05-01 [OBD]
    546 FreeBSD 7.2		2009-05-04 [FBD]
    547 Mac OS X 10.6		2009-06-08 [APL]
    548 NetBSD 5.0.1		2009-08-02 [NBD] (security/critical release)
    549 DragonFly 2.4.0		2009-09-16 [DFB]
    550 OpenBSD 4.6		2009-10-18 [OBD]
    551 FreeBSD 8.0		2009-11-26 [FBD]
    552 NetBSD 5.0.2		2010-02-12 [NBD] (security/critical release)
    553 FreeBSD 7.3		2010-03-23 [FBD]
    554 DragonFly 2.6.0		2010-03-28 [DFB]
    555 OpenBSD 4.7		2010-05-19 [OBD]
    556 FreeBSD 8.1		2010-07-24 [FBD]
    557 DragonFly 2.8.2		2010-10-30 [DFB]
    558 OpenBSD 4.8		2010-11-01 [OBD]
    559 NetBSD 5.1		2010-11-19 [NBD]
    560 FreeBSD 7.4		2011-02-24 [FBD]
    561 FreeBSD 8.2		2011-02-24 [FBD]
    562 DragonFly 2.10.1	2011-04-26 [DFB]
    563 OpenBSD 4.9		2011-05-01 [OBD]
    564 Mac OS X 10.7		2011-07-20 [APL]
    565 OpenBSD 5.0		2011-11-01 [OBD]
    566 FreeBSD 9.0		2012-01-12 [FBD]
    567 NetBSD 5.1.2		2012-02-02 [NBD] (security/critical release)
    568 DragonFly 3.0.1		2012-02-21 [DFB]
    569 FreeBSD 8.3		2012-04-18 [FBD]
    570 OpenBSD 5.1		2012-05-01 [OBD]
    571 Mac OS X 10.8		2012-07-25 [APL]
    572 NetBSD 6.0		2012-10-17 [NBD]
    573 OpenBSD 5.2		2012-11-01 [OBD]
    574 DragonFly 3.2.1		2012-11-02 [DFB]
    575 NetBSD 5.2		2012-12-03 [NBD]
    576 NetBSD 6.0.1		2012-12-26 [NBD] (security/critical release)
    577 FreeBSD 9.1		2012-12-30 [FBD]
    578 DragonFly 3.4.1		2013-04-29 [DFB]
    579 OpenBSD 5.3		2013-05-01 [OBD]
    580 NetBSD 6.0.2		2013-05-18 [NBD] (security/critical release)
    581 NetBSD 6.1		2013-05-18 [NBD]
    582 FreeBSD 8.4		2013-06-07 [FBD]
    583 
    584 Bibliography
    585 ------------------------
    586 
    587 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
    588 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
    589 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
    590 
    591 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
    592 Company, Inc., 1994. ISBN 0-201-54777-5
    593 
    594 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
    595 Quarterman. The Design and Implementation of the 4.4BSD Operating
    596 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
    597 
    598 McKusick, Marshall Kirk, George Neville-Neil. The Design and
    599 Implementation of the FreeBSD Operating System.
    600 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
    601 
    602 Doug McIlroy. Research Unix Reader.
    603 
    604 Michael G. Brown. The Role of BSD in the Development of Unix.
    605 Presented to the Tasmanian Unix Special Interest Group of the
    606 Australian Computer Society, Hobart, August 1993.
    607 
    608 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
    609 URL: http://www.byte.com/art/9410/sec8/art3.htm
    610 
    611 Andreas Klemm, Lars Kller. If you're going to San Francisco ...
    612 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
    613 
    614 BSD Release Announcements collection.
    615 URL: http://www.FreeBSD.org/releases/
    616 
    617 BSD Hypertext Man Pages
    618 URL: http://www.FreeBSD.org/cgi/man.cgi
    619 
    620 UNIX history graphing project
    621 URL: http://minnie.tuhs.org/Unix_History/index.html
    622 
    623 UNIX history
    624 URL: http://www.levenez.com/unix/
    625 
    626 James Howard: The BSD Family Tree
    627 URL: http://ezine.daemonnews.org/200104/bsd_family.html
    628 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
    629 
    630 
    631 Acknowledgments
    632 ---------------
    633 
    634 Josh Gilliam for suggestions, bug fixes, and finding very old
    635 original BSD announcements from Usenet or tapes.
    636 
    637 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
    638 
    639 --
    640 Copyright (c) 1997-2012 Wolfram Schneider <wosch (a] FreeBSD.ORG>
    641 URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree
    642 
    643 $FreeBSD$
    644