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1 The UNIX system family tree: Research and BSD
2 ---------------------------------------------
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     |      | |      |        |                       |
257  |     |       |      |      | |   NetBSD      |                       |
258  |     |       |      |      | |    5.1.3      |                       |
259  |     |       |      |      | |      |        |                       |
260  |     |       |      |      | |   NetBSD      |                       |
261  |     |       |      |      | |    5.1.4      |                       |
262  |     |       |      |      | |           OpenBSD 5.1                 |
263  |     |       |   Mac OS X  | `----.          |                       |
264  |     |       |     10.8    |       \         |                       |
265  |     |       |      |   NetBSD 6.0  |        |                       |
266  |     |       |      |      | | |    |    OpenBSD 5.2         DragonFly 3.2.1
267  |  FreeBSD    |      |      | | | NetBSD      |                       |
268  |    9.1      |      |      | | |   5.2       |                       |
269  |     |       |      |      | | |    |        |                       |
270  |     |       |      |      | | | NetBSD      |                       |
271  |     |       |      |      | | |  5.2.1      |                       |
272  |     |       |      |      | | |    |        |                       |
273  |     |       |      |      | | | NetBSD      |                       |
274  |     |       |      |      | | |  5.2.2      |                       |
275  |     |       |      |      | | |             |                       |
276  |     |       |      |      | |  \            |                       |
277  |     |       |      |      | |   NetBSD      |                       |
278  |     |       |      |      | |    6.0.1      |                       |
279  |     |       |      |      | |      |   OpenBSD 5.3          DragonFly 3.4.1
280  |     |       |      |      | |   NetBSD      |                       |
281  |     |       |      |      | |    6.0.2      |                       |
282  |     |       |      |      | |      |        |                       |
283  |     |       |      |      | |  NetBSD 6.0.3 |                       |
284  |     |       |      |      | |      |        |                       |
285  |     |       |      |      | |  NetBSD 6.0.4 |                       |
286  |     |       |      |      | |      |        |                       |
287  |     |       |      |      | |  NetBSD 6.0.5 |                       |
288  |     |       |      |      | |               |                       |
289  |     |       |      |      |  `-NetBSD 6.1   |                       |
290  |     |    FreeBSD   |      |       |         |                       |
291  |     |      8.4     |      |    NetBSD 6.1.1 |                       |
292  |     |              |      |       |         |                       |
293  |  FreeBSD           |      |    NetBSD 6.1.2 |                       |
294  |    9.2          Mac OS X  |       |         |                       |
295  |                   10.9    |       |    OpenBSD 5.4                  |
296  |                    |      |       |         |               DragonFly 3.6.0
297  |                    |      |       |         |                       |
298  *--FreeBSD           |      |    NetBSD 6.1.3 |                       |
299  |   10.0             |      |       |         |                       |
300  |                    |      |    NetBSD 6.1.4 |                       |
301  |                    |      |                 |                       |
302  |                    |      |                 |               DragonFly 3.6.1
303  |                    |      |            OpenBSD 5.5                  |
304  |                    |      |                 |                       |
305 FreeBSD 11 -current   |  NetBSD -current  OpenBSD -current   DragonFly -current
306  |                    |      |                 |                       |
307  v                    v      v                 v                       v
309 Time
310 ----------------
312 Time tolerance +/- 6 months, depending on which book/article you read; if it
313 was the announcement in Usenet or if it was available as tape.
315 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
316         and John Quarterman. The Design and Implementation of
317         the 4.4BSD Operating System.
318 [APL] Apple website [http://www.apple.com/macosx/]
319 [BSDI] Berkeley Software Design, Inc.
320 [DFB] DragonFlyBSD Project, The.
321 [DOC] README, COPYRIGHT on tape.
322 [FBD] FreeBSD Project, The.
323 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
324         Volume 11, Info 4, April, 1987.
325 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
326         comp.bugs.4bsd.ucb-fixes, June 15, 1988.
327 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
328         Changes in the Kernel in 2.9BSD. Second Berkeley Software
329         Distribution UNIX Version 2.9, July, 1983.
330 [NBD] NetBSD Project, The.
331 [OBD] OpenBSD Project, The.
332 [QCU] Salus, Peter H. A quarter century of UNIX.
333 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
334 [TUHS] The Unix Historical Society.  http://minnie.tuhs.org/Unix_History/.
335 [USE] Usenet announcement.
336 [WRS] Wind River Systems, Inc.
337 [dmr] Dennis Ritchie, via E-Mail
339 Multics                 1965
340 UNIX                    Summer 1969
341                                 DEC PDP-7
342 First   Edition         1971-11-03 [QCU]
343                                 DEC PDP-11/20, Assembler
344 Second  Edition         1972-06-12 [QCU]
345                                 10 UNIX installations
346 Third   Edition         1973-02-xx [QCU]
347                                 Pipes, 16 installations
348 Fourth  Edition         1973-11-xx [QCU]
349                                 rewriting in C effected,
350                                 above 30 installations
351 Fifth   Edition         1974-06-xx [QCU]
352                                 above 50 installations
353 Sixth   Edition         1975-05-xx [QCU]
354                                 port to DEC Vax
355 Seventh Edition         1979-01-xx [QCU]
356                                 first portable UNIX
357 Eighth  Edition         1985-02-xx [QCU]
358                                 VAX 11/750, VAX 11/780 [dmr]
359                                 descended from 4.1c BSD [dmr]
360                                 descended from 4.1 BSD [44B]
361                         scooping-out and replacement of the character-device
362                         and networking part by the streams mechanism
364 Ninth   Edition         1986-09-xx [QCU]
365 Tenth   Edition         1989-10-xx [QCU]
367 1BSD                    late 1977
368                         1978-03-09 [QCU]
369                                 PDP-11, Pascal, ex(1)
370                                 30 free copies of 1BSD sent out
371                                 35 tapes sold for 50 USD [QCU]
372 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
373                                 75 2BSD tapes shipped
374 2.79BSD                 1980-04-xx [TUHS]
375 2.8BSD                  1981-07-xx [KSJ]
377 2.8.1BSD                1982-01-xx [QCU]
378                                 set of performance improvements
379 2.9BSD                  1983-07-xx [KSJ]
380 2.9.1BSD                1983-11-xx [TUHS]
381 2.9BSD-Seismo           1985-08-xx [SMS]
382 2.10BSD                 1987-04-xx [KKK]
383 2.10.1BSD               1989-01-xx [SMS]
384 2.11BSD                 1992-02-xx [SMS]
385 2.11BSD rev #430        1999-12-13 [SMS]
387 32V                     1978-1[01]-xx [QCU]
388 3BSD                    late 1979 [QCU] March 1980 [TUHS]
389                                 virtual memory, page replacement,
390                                 demand paging
391 4.0BSD                  1980-10-xx
392 4.1BSD                  1981-07-08 [DOC]
393 4.1aBSD                 1982-04-xx
394                                 alpha release, 100 sites, networking [44B]
395 4.1bBSD                         internal release, fast filesystem [44B]
396 4.1cBSD                 late 1982
397                                 beta release, IPC [44B]
398 4.2BSD                  1983-09-xx [QCU]
399                         1983-08-03 [DOC]
400 4.3BSD                  1986-06-xx [QCU]
401                         1986-04-05 [KB], [DOC]
402 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
403 4.3BSD NET/1            1988-11-xx [QCU]
404                         1989-01-01 [DOC]
405 4.3BSD Reno             1990-06-29 [QCU], [DOC]
406 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
408 BSD/386 ALPHA           1991-12-xx [BSDI]
409                                 first code released to people outside BSDI
410 386BSD 0.0              1992-02-xx [DOC]
411 BSD/386 0.3.1           1992-04-xx [BSDI] first ext. beta; B customers
412 BSD/386 0.3.3           1992-06-xx [BSDI] first CDROM version
413 386BSD 0.1              1992-07-28 [DOC]
414 4.4BSD Alpha            1992-07-07
415 BSD/386 0.9.3           1992-10-xx [BSDI]
416                                 first external gamma; G customers
417 BSD/386 0.9.4           1992-12-xx [BSDI]
418                                 would have been 1.0 except for request
419                                 for preliminary injunction
420 BSD/386 1.0             1993-03-xx [BSDI]
421                                 injunction denied; first official release
422 NetBSD 0.8              1993-04-20 [NBD]
423 4.4BSD                  1993-06-01 [USE]
424 NetBSD 0.9              1993-08-23 [NBD]
425 FreeBSD 1.0             1993-11-01 [FBD]
426 FreeBSD 1.0.2           1993-11-14 [FBD]
427                                 supersedes 1.0 13 days after release.
428 BSD/386 1.1             1994-02-xx [BSDI]
429 4.4BSD Lite             1994-03-01 [USE]
430 FreeBSD 1.1             1994-05-07 [FBD]
431 FreeBSD 1.1.5           1994-06-30 [FBD]
432 FreeBSD 1.1.5.1         1994-07-05 [FBD]
433                                 supersedes 1.1.5 5 days after release.
434 NetBSD 1.0              1994-10-26 [NBD]
435 386BSD 1.0              1994-11-12 [USE]
436 FreeBSD 2.0             1994-11-23 [FBD]
437 BSD/OS 2.0              1995-01-xx [BSDI] 4.4 lite based
438 FreeBSD 2.0.5           1995-06-10 [FBD]
439 BSD/OS 2.0.1            1995-06-xx [BSDI]
440 4.4BSD Lite Release 2   1995-06-xx [44B]
441                                 the true final distribution from the CSRG
442 FreeBSD 2.1.0           1995-11-19 [FBD]
443 NetBSD 1.1              1995-11-26 [NBD]
444 BSD/OS 2.1              1996-01-xx [BSDI]
445 FreeBSD 2.1.5           1996-07-14 [FBD]
446 NetBSD 1.2              1996-10-04 [NBD]
447 OpenBSD 2.0             1996-10-18 [OBD]
448 FreeBSD 2.1.6           1996-11-16 [FBD]
449 FreeBSD 2.1.6.1         1996-11-25 [FBD] (sendmail security release)
450 Rhapsody                1997-xx-xx
451 FreeBSD 2.1.7           1997-02-20 [FBD]
452 BSD/OS 3.0              1997-02-xx [BSDI] 4.4 lite2 based
453 FreeBSD 2.2.0           1997-03-16 [FBD]
454 FreeBSD 2.2.1           1997-03-25 [FBD]
455 FreeBSD 2.2.2           1997-05-16 [FBD]
456 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
457 OpenBSD 2.1             1997-06-01 [OBD]
458 FreeBSD 2.2.5           1997-10-22 [FBD]
459 OpenBSD 2.2             1997-12-01 [OBD]
460 NetBSD 1.3              1998-01-04 [NBD]
461 FreeBSD 2.2.6           1998-03-25 [FBD]
462 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
463 BSD/OS 3.1              1998-03-xx [BSDI]
464 OpenBSD 2.3             1998-05-19 [OBD]
465 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
466 FreeBSD 2.2.7           1998-07-22 [FBD]
467 BSD/OS 4.0              1998-08-xx [BSDI]
468                                 2-lock MP support, ELF executables
469 FreeBSD 3.0             1998-10-16 [FBD]
470                                 FreeBSD-3.0 is a snapshot from -current,
471                                 while 3.1 and 3.2 are from 3.x-stable which
472                                 was branched quite some time after 3.0-release
473 FreeBSD 2.2.8           1998-11-29 [FBD]
474 OpenBSD 2.4             1998-12-01 [OBD]
475 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
476 FreeBSD 3.1             1999-02-15 [FBD]
477 BSD/OS 4.0.1            1999-03-xx [BSDI]
478 NetBSD 1.4              1999-05-12 [NBD]
479 FreeBSD 3.2             1999-05-17 [FBD]
480 OpenBSD 2.5             1999-05-19 [OBD]
481 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
482 FreeBSD 3.3             1999-09-17 [FBD]
483 OpenBSD 2.6             1999-12-01 [OBD]
484 FreeBSD 3.4             1999-12-20 [FBD]
485 BSD/OS 4.1              1999-12-xx [BSDI]
486 FreeBSD 4.0             2000-03-13 [FBD]
487 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
488 OpenBSD 2.7             2000-06-15 [OBD]
489 FreeBSD 3.5             2000-06-24 [FBD]
490 FreeBSD 4.1             2000-07-27 [FBD]
491 FreeBSD 3.5.1           2000-07-28 [FBD]
492 FreeBSD 4.1.1           2000-09-25 [FBD] (a network-only patch release)
493 FreeBSD 4.2             2000-11-21 [FBD]
494 NetBSD 1.4.3            2000-11-25 [NBD] (patch release)
495 BSD/OS 4.2              2000-11-29 [BSDI]
496 OpenBSD 2.8             2000-12-01 [OBD]
497 NetBSD 1.5              2000-12-06 [NBD]
498 Mac OS X 10.0           2001-03-24 [APL]
499 FreeBSD 4.3             2001-04-20 [FBD]
500 OpenBSD 2.9             2001-06-01 [OBD]
501 NetBSD 1.5.1            2001-07-11 [NBD] (patch release)
502 NetBSD 1.5.2            2001-09-13 [NBD] (patch release)
503 FreeBSD 4.4             2001-09-18 [FBD]
504 Mac OS X 10.1           2001-09-29 [APL]
505 OpenBSD 3.0             2001-12-01 [OBD]
506 FreeBSD 4.5             2002-01-29 [FBD]
507 BSD/OS 4.3              2002-03-14 [WRS]
508 OpenBSD 3.1             2002-05-19 [OBD]
509 FreeBSD 4.6             2002-06-15 [FBD]
510 NetBSD 1.5.3            2002-07-22 [NBD] (patch release)
511 FreeBSD 4.6.2           2002-08-15 [FBD] (patch release)
512 Mac OS X 10.2           2002-08-23 [APL]
513 NetBSD 1.6              2002-09-14 [NBD]
514 FreeBSD 4.7             2002-10-08 [FBD]
515 OpenBSD 3.2             2002-11-01 [OBD]
516 FreeBSD 5.0             2003-01-17 [FBD]
517                                 FreeBSD 5.0 is a separate branch off of
518                                 -current, similar to 3.0.
519 FreeBSD 4.8             2003-04-03 [FBD]
520 NetBSD 1.6.1            2003-04-21 [NBD] (patch release)
521 OpenBSD 3.3             2003-05-01 [OBD]
522 BSD/OS 5.0              2003-05-?? [WRS]
523 FreeBSD 5.1             2003-06-09 [FBD]
524 Mac OS X 10.3           2003-10-24 [APL]
525 FreeBSD 4.9             2003-10-28 [FBD]
526 BSD/OS 5.1 ISE          2003-10-?? [WRS] (final version)
527 OpenBSD 3.4             2003-11-01 [OBD]
528 FreeBSD 5.2             2004-01-12 [FBD]
529 FreeBSD 5.2.1           2004-02-22 [FBD] (patch release)
530 NetBSD 1.6.2            2004-03-01 [NBD] (patch release)
531 OpenBSD 3.5             2004-04-01 [OBD]
532 FreeBSD 4.10            2004-05-27 [FBD]
533 DragonFly 1.0           2004-07-12 [DFB]
534 OpenBSD 3.6             2004-10-29 [OBD]
535 FreeBSD 5.3             2004-11-06 [FBD]
536 NetBSD 2.0              2004-12-09 [NBD]
537 FreeBSD 4.11            2005-01-25 [FBD]
538 DragonFly 1.2.0         2005-04-08 [DFB]
539 NetBSD 2.0.2            2005-04-14 [NBD] (security/critical release)
540 Mac OS X 10.4           2005-04-29 [APL]
541 FreeBSD 5.4             2005-05-09 [FBD]
542 OpenBSD 3.7             2005-05-19 [OBD]
543 NetBSD 2.0.3            2005-10-31 [NBD] (security/critical release)
544 OpenBSD 3.8             2005-11-01 [OBD]
545 FreeBSD 6.0             2005-11-01 [FBD]
546 NetBSD 2.1              2005-11-02 [NBD]
547 NetBSD 3.0              2005-12-23 [NBD]
548 DragonFly 1.4.0         2006-01-08 [DFB]
549 OpenBSD 3.9             2006-05-01 [OBD]
550 FreeBSD 6.1             2006-05-08 [FBD]
551 FreeBSD 5.5             2006-05-25 [FBD]
552 NetBSD 3.0.1            2006-07-24 [NBD] (security/critical release)
553 DragonFly 1.6.0         2006-07-24 [DFB]
554 OpenBSD 4.0             2006-11-01 [OBD]
555 NetBSD 3.0.2            2006-11-04 [NBD] (security/critical release)
556 NetBSD 3.1              2006-11-04 [NBD]
557 FreeBSD 6.2             2007-01-15 [FBD]
558 DragonFly 1.8.0         2007-01-30 [DFB]
559 OpenBSD 4.1             2007-05-01 [OBD]
560 DragonFly 1.10.0        2007-08-06 [DFB]
561 Mac OS X 10.5           2007-10-26 [APL]
562 OpenBSD 4.2             2007-11-01 [OBD]
563 NetBSD 4.0              2007-12-19 [NBD]
564 FreeBSD 6.3             2008-01-18 [FBD]
565 DragonFly 1.12.0        2008-02-26 [DFB]
566 FreeBSD 7.0             2008-02-27 [FBD]
567 OpenBSD 4.3             2008-05-01 [OBD]
568 DragonFly 2.0.0         2008-07-21 [DFB]
569 OpenBSD 4.4             2008-11-01 [OBD]
570 FreeBSD 6.4             2008-11-28 [FBD]
571 FreeBSD 7.1             2009-01-04 [FBD]
572 DragonFly 2.2.0         2009-02-17 [DFB]
573 NetBSD 5.0              2009-04-29 [NBD]
574 OpenBSD 4.5             2009-05-01 [OBD]
575 FreeBSD 7.2             2009-05-04 [FBD]
576 Mac OS X 10.6           2009-06-08 [APL]
577 NetBSD 5.0.1            2009-08-02 [NBD] (security/critical release)
578 DragonFly 2.4.0         2009-09-16 [DFB]
579 OpenBSD 4.6             2009-10-18 [OBD]
580 FreeBSD 8.0             2009-11-26 [FBD]
581 NetBSD 5.0.2            2010-02-12 [NBD] (security/critical release)
582 FreeBSD 7.3             2010-03-23 [FBD]
583 DragonFly 2.6.0         2010-03-28 [DFB]
584 OpenBSD 4.7             2010-05-19 [OBD]
585 FreeBSD 8.1             2010-07-24 [FBD]
586 DragonFly 2.8.2         2010-10-30 [DFB]
587 OpenBSD 4.8             2010-11-01 [OBD]
588 NetBSD 5.1              2010-11-19 [NBD]
589 FreeBSD 7.4             2011-02-24 [FBD]
590 FreeBSD 8.2             2011-02-24 [FBD]
591 DragonFly 2.10.1        2011-04-26 [DFB]
592 OpenBSD 4.9             2011-05-01 [OBD]
593 Mac OS X 10.7           2011-07-20 [APL]
594 OpenBSD 5.0             2011-11-01 [OBD]
595 FreeBSD 9.0             2012-01-12 [FBD]
596 NetBSD 5.1.2            2012-02-02 [NBD] (security/critical release)
597 DragonFly 3.0.1         2012-02-21 [DFB]
598 FreeBSD 8.3             2012-04-18 [FBD]
599 OpenBSD 5.1             2012-05-01 [OBD]
600 Mac OS X 10.8           2012-07-25 [APL]
601 NetBSD 6.0              2012-10-17 [NBD]
602 OpenBSD 5.2             2012-11-01 [OBD]
603 DragonFly 3.2.1         2012-11-02 [DFB]
604 NetBSD 5.2              2012-12-03 [NBD]
605 NetBSD 6.0.1            2012-12-26 [NBD] (security/critical release)
606 FreeBSD 9.1             2012-12-30 [FBD]
607 DragonFly 3.4.1         2013-04-29 [DFB]
608 OpenBSD 5.3             2013-05-01 [OBD]
609 NetBSD 6.0.2            2013-05-18 [NBD] (security/critical release)
610 NetBSD 6.1              2013-05-18 [NBD]
611 FreeBSD 8.4             2013-06-07 [FBD]
612 NetBSD 6.1.1            2013-08-22 [NBD]
613 NetBSD 5.1.3            2013-09-29 [NBD]
614 NetBSD 5.2.1            2013-09-29 [NBD]
615 FreeBSD 9.2             2013-09-30 [FBD]
616 NetBSD 6.0.3            2013-09-30 [NBD]
617 NetBSD 6.1.2            2013-09-30 [NBD]
618 Mac OS X 10.9           2013-10-22 [APL]
619 OpenBSD 5.4             2013-11-01 [OBD]
620 DragonFly 3.6.0         2013-11-25 [DFB]
621 FreeBSD 10.0            2014-01-20 [FBD]
622 NetBSD 5.1.4            2014-01-25 [NBD]
623 NetBSD 5.2.2            2014-01-25 [NBD]
624 NetBSD 6.0.4            2014-01-25 [NBD]
625 NetBSD 6.1.3            2014-01-25 [NBD]
626 DragonFly 3.6.1         2014-02-22 [DFB]
627 NetBSD 6.0.5            2014-04-12 [NBD]
628 NetBSD 6.1.4            2014-04-12 [NBD]
629 OpenBSD 5.5             2014-05-01 [OBD]
631 Bibliography
632 ------------------------
634 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
635 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
636 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
638 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
639 Company, Inc., 1994. ISBN 0-201-54777-5
641 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
642 Quarterman. The Design and Implementation of the 4.4BSD Operating
643 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
645 McKusick, Marshall Kirk, George Neville-Neil. The Design and
646 Implementation of the FreeBSD Operating System.
647 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
649 Doug McIlroy. Research Unix Reader.
651 Michael G. Brown. The Role of BSD in the Development of Unix.
652 Presented to the Tasmanian Unix Special Interest Group of the
653 Australian Computer Society, Hobart, August 1993.
655 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
656 URL: http://www.byte.com/art/9410/sec8/art3.htm
658 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
659 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
661 BSD Release Announcements collection.
662 URL: http://www.FreeBSD.org/releases/
664 BSD Hypertext Man Pages
665 URL: http://www.FreeBSD.org/cgi/man.cgi
667 UNIX history graphing project
668 URL: http://minnie.tuhs.org/Unix_History/index.html
670 UNIX history
671 URL: http://www.levenez.com/unix/
673 James Howard: The BSD Family Tree
674 URL: http://ezine.daemonnews.org/200104/bsd_family.html
675 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
678 Acknowledgments
679 ---------------
681 Josh Gilliam for suggestions, bug fixes, and finding very old
682 original BSD announcements from Usenet or tapes.
684 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
687 Copyright (c) 1997-2012 Wolfram Schneider <wosch@FreeBSD.ORG>
688 URL: http://svnweb.freebsd.org/base/head/share/misc/bsd-family-tree
690 $FreeBSD$