xref: /freebsd/share/misc/bsd-family-tree (revision 944223076fbcb681a8eb3e118ddafab79b21ac3d)
1The UNIX system family tree: Research and BSD
2---------------------------------------------
3
4First Edition (V1)
5     |
6Second Edition (V2)
7     |
8Third Edition (V3)
9     |
10Fourth Edition (V4)
11     |
12Fifth Edition (V5)
13     |
14Sixth Edition (V6) -----*
15       \                |
16        \               |
17         \              |
18Seventh 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     /            |                      |
38Eighth Edition    |                   2.9BSD-Seismo
39     |            |                      |
40     +----<--- 4.2BSD               2.9.1BSD
41     |            |                      |
42     +----<--- 4.3BSD -------------> 2.10BSD
43     |            |               /      |
44Ninth Edition     |              / 2.10.1BSD
45     |         4.3BSD Tahoe-----+        |
46     |            |              \       |
47     |            |                \     |
48     v            |                  2.11BSD
49Tenth Edition     |                      |
50                  |                  2.11BSD rev #430
51               4.3BSD NET/1              |
52                  |                      v
53               4.3BSD Reno
54                  |
55   *---------- 4.3BSD NET/2 -------------------+-------------*
56   |                    |                      |             |
57386BSD 0.0              |                      |           BSD/386 ALPHA
58   |                    |                      |             |
59386BSD 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   |               /    |                      |             |
67FreeBSD 1.0 <-----'     *--NetBSD 0.9          |           BSD/386 1.1
68   |                    |           .----- 4.4BSD Lite       |
69FreeBSD 1.1             |          /     /     |     \       |
70   |                    |         /     |      |      \      |
71FreeBSD 1.1.5       .---|--------'      |      |       \     |
72   |               /    |               |      |        \    |
73FreeBSD 1.1.5.1   /     |               |      |         \   |
74   |             /      *--NetBSD 1.0 <-'      |          \  |
75   |            /       |                      |           \ |
76FreeBSD 2.0 <--'        |                      |           BSD/OS 2.0
77   |                     \                     |             |
78FreeBSD 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     |
85FreeBSD 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 |     FreeBSD 2.2.8 | |     |    |            |             |
114 |         |         | |     |    |            |             |
115 |         v         | |     |    |        OpenBSD 2.4       |
116 |     FreeBSD 2.2.9 | |     |    |            |             |
117 |                   | |     |    |            |             |
118FreeBSD 3.0 <--------* |     |    v            |             |
119 |                     |     | NetBSD 1.3.3    |             |
120 *---FreeBSD 3.1       |     |                 |             |
121 |       |             |     |                 |           BSD/OS 4.0.1
122 |   FreeBSD 3.2----*  |  .--*--NetBSD 1.4 OpenBSD 2.5       |
123 |       |          |  |  |  |    |            |             |
124 |       |          |  |  |  |    |            |             |
125 |       |          |  |  |  |    |            |             |
126 |   FreeBSD 3.3    |  |  |  | NetBSD 1.4.1    |             |
127 |       |          |  |  |  |    |        OpenBSD 2.6       |
128 |   FreeBSD 3.4    |  |  |  |    |            |             |
129 |           |      |  |  |  |    |            |           BSD/OS 4.1
130FreeBSD 4.0  |      |  |  |  | NetBSD 1.4.2    |             |
131 |           |      |  |  |  |    |            |             |
132 |           |      |  |  |  |    |            |             |
133 |   FreeBSD 3.5    |  |  |  |    |        OpenBSD 2.7       |
134 |           |      |  |  |  |    |            |             |
135 |   FreeBSD 3.5.1  |  |  |  |    |            |             |
136 |                  |  |  |  |    |            |             |
137 *---FreeBSD 4.1    |  |  |  |    |            |             |
138 |      |           |  |  |  |    |            |             |
139 |   FreeBSD 4.1.1  |  |  /  |    |            |             |
140 |      |           |  | /   |    |            |             |
141 |   FreeBSD 4.2   Darwin/   | NetBSD 1.4.3    |             |
142 |      |         Mac OS X   |             OpenBSD 2.8     BSD/OS 4.2
143 |      |             |      |                 |             |
144 |      |             |      |                 |             |
145 |      |           10.0     *--NetBSD 1.5     |             |
146 |   FreeBSD 4.3      |      |    |            |             |
147 |      |             |      |    |        OpenBSD 2.9       |
148 |      |             |      | NetBSD 1.5.1    |             |
149 |      |             |      |    |            |             |
150 |   FreeBSD 4.4-.    |      | NetBSD 1.5.2    |             |
151 |      |        | Mac OS X  |    |            |             |
152 |      |        |   10.1    |    |        OpenBSD 3.0       |
153 |   FreeBSD 4.5 |    |      |    |            |             |
154 |      |         \   |      |    |            |           BSD/OS 4.3
155 |   FreeBSD 4.6   \  |      |    |        OpenBSD 3.1       |
156 |      |           \ |      | NetBSD 1.5.3    |             |
157 |   FreeBSD 4.6.2 Mac OS X  |                 |             |
158 |      |            10.2    |                 |             |
159 |   FreeBSD 4.7      |      |                 |             |
160 |      |             |      *--NetBSD 1.6 OpenBSD 3.2       |
161 |   FreeBSD 4.8      |      |    |            |             |
162 |      |             |      | NetBSD 1.6.1    |             |
163 |      |--------.    |      |    |        OpenBSD 3.3     BSD/OS 5.0
164 |      |         \   |      |    |            |             |
165 |   FreeBSD 4.9   |  |      |    |        OpenBSD 3.4     BSD/OS 5.1 ISE
166 |      |          |  |      |    |            |
167 |      |          |  |      | NetBSD 1.6.2    |
168 |      |          |  |      |    |            |
169 |      |          |  |      |    |        OpenBSD 3.5
170 |      |          |  |      |    v            |
171 |   FreeBSD 4.10  |  |      |                 |
172 |      |          |  |      |                 |
173 |   FreeBSD 4.11  |  |      |                 |
174 |                 |  |      |                 |
175 |                  `-|------|-----------------|---------------------.
176 |                    |      |                 |                      \
177FreeBSD 5.0           |      |                 |                       |
178 |                    |      |                 |                       |
179FreeBSD 5.1           |      |                 |               DragonFly 1.0
180 |          \         |      |                 |                       |
181 |           ----- Mac OS X  |                 |                       |
182 |                   10.3    |                 |                       |
183FreeBSD 5.2           |      |                 |                       |
184 |      |             |      |                 |                       |
185 |   FreeBSD 5.2.1    |      |                 |                       |
186 |                    |      |                 |                       |
187 *-------FreeBSD 5.3  |      |                 |                       |
188 |           |        |      |             OpenBSD 3.6                 |
189 |           |        |      *--NetBSD 2.0     |                       |
190 |           |        |      | |  |            |               DragonFly 1.2.0
191 |           |     Mac OS X  | | NetBSD 2.0.2  |                       |
192 |           |       10.4    | |  |            |                       |
193 |       FreeBSD 5.4  |      | |  |            |                       |
194 |           |        |      | |  |        OpenBSD 3.7                 |
195 |           |        |      | | NetBSD 2.0.3  |                       |
196 |           |        |      | |  |            |                       |
197 *--FreeBSD  |        |      | |  v        OpenBSD 3.8                 |
198 |    6.0    |        |      | |               |                       |
199 |     |     |        |      |  \              |                       |
200 |     |     |        |      | NetBSD 2.1      |                       |
201 |     |     |        |      |                 |                       |
202 |     |     |        |      *--NetBSD 3.0     |                       |
203 |     |     |        |      | |  |            |               DragonFly 1.4.0
204 |     |     |        |      | |  |        OpenBSD 3.9                 |
205 |  FreeBSD  |        |      | |  |            |                       |
206 |    6.1    |        |      | |  |            |                       |
207 |     |  FreeBSD 5.5 |      | |  |            |                       |
208 |     |              |      | | NetBSD 3.0.1  |               DragonFly 1.6.0
209 |     |              |      | |  |            |                       |
210 |     |              |      | |  |        OpenBSD 4.0                 |
211 |     |              |      | | NetBSD 3.0.2  |                       |
212 |     |              |      | NetBSD 3.1      |                       |
213 | FreeBSD 6.2        |      |                 |                       |
214 |     |              |      |                 |               DragonFly 1.8.0
215 |     |              |      |             OpenBSD 4.1                 |
216 |     |              |      |                 |               DragonFly 1.10.0
217 |     |           Mac OS X  |                 |                       |
218 |     |             10.5    |                 |                       |
219 |     |              |      |             OpenBSD 4.2                 |
220 |     |              |      *--NetBSD 4.0     |                       |
221 | FreeBSD 6.3        |      |    |            |                       |
222 |            \       |      |    |            |                       |
223 *--FreeBSD    |      |      |    |            |               DragonFly 1.12.0
224 |    7.0      |      |      |    |            |                       |
225 |     |       |      |      |    |        OpenBSD 4.3                 |
226 |     |       |      |      | NetBSD          |               DragonFly 2.0.0
227 |     |    FreeBSD   |      |  4.0.1      OpenBSD 4.4                 |
228 |     |      6.4     |      |                 |                       |
229 |     |              |      |                 |                       |
230 |  FreeBSD 7.1       |      |                 |                       |
231 |     |              |      |                 |               DragonFly 2.2.0
232 |  FreeBSD 7.2       |      *--NetBSD     OpenBSD 4.5                 |
233 |             \      |      |   5.0           |                       |
234 |             \      |      |  / | \          |                       |
235 |              |  Mac OS X  |  | |  \         |                       |
236 |              |    10.6    |  | |   \        |                       |
237 |              |     |      |  | | NetBSD     |               DragonFly 2.4.0
238 |              |     |      |  | |  5.0.1 OpenBSD 4.6                 |
239 |              |     |      |  | |    |       |                       |
240 *--FreeBSD     |     |      |  | |    |       |                       |
241 |    8.0       |     |      |  | |    |       |                       |
242 |     |     FreeBSD  |      |  | | NetBSD     |                       |
243 |     |       7.3    |      |  | |  5.0.2     |               DragonFly 2.6.0
244 |     |        |     |      |  | |        OpenBSD 4.7                 |
245 |  FreeBSD     |     |      |  | |            |                       |
246 |    8.1       |     |      |  | |            |                       |
247 |     |        |     |      |  | |            |               DragonFly 2.8.2
248 |     |        |     |      |  | |        OpenBSD 4.8                 |
249 |     |        |     |      |  | *--NetBSD    |                       |
250 |  FreeBSD  FreeBSD  |      |  |    5.1       |                       |
251 |    8.2      7.4    |      |  |     |        |               DragonFly 2.10.1
252 |     |              |      |  |     |    OpenBSD 4.9                 |
253 |     `-----.     Mac OS X  |  |     |        |                       |
254 |            \      10.7    |  |     |        |                       |
255 |             |      |      |  |     |    OpenBSD 5.0                 |
256 *--FreeBSD    |      |      |  |     |        |                       |
257 |    9.0      |      |      |  |  NetBSD      |               DragonFly 3.0.1
258 |     |    FreeBSD   |      |  |   5.1.2      |                       |
259 |     |      8.3     |      |  |     |        |                       |
260 |     |       |      |      |  |  NetBSD      |                       |
261 |     |       |      |      |  |   5.1.3      |                       |
262 |     |       |      |      |  |     |        |                       |
263 |     |       |      |      |  |  NetBSD      |                       |
264 |     |       |      |      |  |   5.1.4      |                       |
265 |     |       |      |      |  |          OpenBSD 5.1                 |
266 |     |       |   Mac OS X  |  `--------.     |                       |
267 |     |       |     10.8    |           |     |                       |
268 |     |       |      |      *--NetBSD   |     |                       |
269 |     |       |      |      |    6.0    |     |                       |
270 |     |       |      |      |    | |    | OpenBSD 5.2         DragonFly 3.2.1
271 |  FreeBSD    |      |      |    | | NetBSD   |                       |
272 |    9.1      |      |      |    | |   5.2    |                       |
273 |     |       |      |      |    | |    |     |                       |
274 |     |       |      |      |    | | NetBSD   |                       |
275 |     |       |      |      |    | |  5.2.1   |                       |
276 |     |       |      |      |    | |    |     |                       |
277 |     |       |      |      |    | | NetBSD   |                       |
278 |     |       |      |      |    | |  5.2.2   |                       |
279 |     |       |      |      |    | |          |                       |
280 |     |       |      |      |    |  \         |                       |
281 |     |       |      |      |    |   NetBSD   |                       |
282 |     |       |      |      |    |    6.0.1   |                       |
283 |     |       |      |      |    |      | OpenBSD 5.3         DragonFly 3.4.1
284 |     |       |      |      |    |   NetBSD   |                       |
285 |     |       |      |      |    |    6.0.2   |                       |
286 |     |       |      |      |    |      |     |                       |
287 |     |       |      |      |    |   NetBSD   |                       |
288 |     |       |      |      |    |    6.0.3   |                       |
289 |     |       |      |      |    |      |     |                       |
290 |     |       |      |      |    |   NetBSD   |                       |
291 |     |       |      |      |    |    6.0.4   |                       |
292 |     |       |      |      |    |      |     |                       |
293 |     |       |      |      |    |   NetBSD   |                       |
294 |     |       |      |      |    |    6.0.5   |                       |
295 |     |       |      |      |    |      |     |                       |
296 |     |       |      |      |    |   NetBSD   |                       |
297 |     |       |      |      |    |    6.0.6   |                       |
298 |     |       |      |      |    |            |                       |
299 |     |       |      |      |    *--NetBSD    |                       |
300 |     |       |      |      |         6.1     |                       |
301 |     |    FreeBSD   |      |          |      |                       |
302 |     |      8.4     |      |       NetBSD    |                       |
303 |     |       |      |      |        6.1.1    |                       |
304 |     |              |      |          |      |                       |
305 |  FreeBSD           |      |       NetBSD    |                       |
306 |    9.2             |      |        6.1.2    |                       |
307 |     |           Mac OS X  |          |      |                       |
308 |     |             10.9    |          |  OpenBSD 5.4                 |
309 |     `-----.        |      |          |      |               DragonFly 3.6.0
310 |            \       |      |          |      |                       |
311 *--FreeBSD    |      |      |       NetBSD    |                       |
312 |   10.0      |      |      |        6.1.3    |                       |
313 |     |       |      |      |          |      |                       |
314 |     |       |      |      |          |      |               DragonFly 3.6.1
315 |     |       |      |      |          |      |                       |
316 |     |       |      |      |          |      |                       |
317 |     |       |      |      |          |      |               DragonFly 3.6.2
318 |     |       |      |      |       NetBSD    |                       |
319 |     |       |      |      |        6.1.4    |                       |
320 |     |       |      |      |          |      |                       |
321 |     |       |      |      |          |  OpenBSD 5.5                 |
322 |     |       |      |      |          |      |                       |
323 |     |       |      |      |          |      |               DragonFly 3.8.0
324 |     |       |      |      |          |      |                       |
325 |     |       |      |      |          |      |                       |
326 |     |       |      |      |          |      |               DragonFly 3.8.1
327 |     |       |      |      |          |      |                       |
328 |     |       |      |      |          |      |                       |
329 |     |       |      |      |          |      |               DragonFly 3.6.3
330 |     |       |      |      |          |      |                       |
331 |     |    FreeBSD   |      |          |      |                       |
332 |     |      9.3     |      |          |      |                       |
333 |     |              |      |       NetBSD    |               DragonFly 3.8.2
334 |     |              |      |        6.1.5    |                       |
335 |     |           Mac OS X  |                 |                       |
336 |     |             10.10   |                 |                       |
337 |     |              |      |             OpenBSD 5.6                 |
338 |  FreeBSD           |      |                 |                       |
339 |   10.1             |      |                 |               DragonFly 4.0.1
340 |     |              |      |                 |                       |
341 |     |              |      |                 |               DragonFly 4.0.2
342 |     |              |      |                 |                       |
343 |     |              |      |                 |               DragonFly 4.0.3
344 |     |              |      |                 |                       |
345 |     |              |      |                 |               DragonFly 4.0.4
346 |     |              |      |                 |                       |
347 |     |              |      |                 |               DragonFly 4.0.5
348 |     |              |      |                 |                       |
349 |     |              |      |             OpenBSD 5.7                 |
350 |     |              |      |                 |               DragonFly 4.2.0
351 |  FreeBSD           |      |                 |                       |
352 |   10.2             |      |                 |                       |
353 |     |            macOS    *--NetBSD 7.0     |                       |
354 |     |            10.11    |   | |       OpenBSD 5.8                 |
355 |     |              |      |   | `--.        |               DragonFly 4.4.1
356 |  FreeBSD           |      |   |    |    OpenBSD 5.9                 |
357 |   10.3             |      |   |    |        |                       |
358 |     |              |      |   | NetBSD      |                       |
359 |     |              |      |   |  7.0.1      |                       |
360 |     `------.       |      |   |    |        |               DragonFly 4.6.0
361 |            |       |      |   |    |        |                       |
362 |            |       |      |   |    |        |                       |
363 *--FreeBSD   |     macOS    |   |    |    OpenBSD 6.0                 |
364 |   11.0     |     10.12    |   | NetBSD      |                       |
365 |     |      |       |      |   |  7.0.2      |                       |
366 |     |      |       |      |   |             |                       |
367 |     |      |       |      |   *--NetBSD     |                       |
368 |     |      |       |      |   |   7.1       |                       |
369 |     |      |       |      |   |    |        |                       |
370 |     |      |       |      |   |    |        |                       |
371 |     |      |     macOS    |   |    |        |               DragonFly 4.8.0
372 |     |      |     10.13    |   |    |    OpenBSD 6.1                 |
373 |  FreeBSD   |       |      |   |    |        |               DragonFly 5.0.0
374 |   11.1  FreeBSD    |      |   |    |        |                       |
375 |     |    10.4      |      |   |    |    OpenBSD 6.2         DragonFly 5.0.1
376 |     |              |      |   |    |        |                       |
377 |     `------.       |      |   | NetBSD      |               DragonFly 5.0.2
378 |            |       |      |   |  7.1.1      |                       |
379 |            |       |      |   |    |        |                       |
380 |            |       |      |   | NetBSD      |                       |
381 |            |       |      |   |  7.1.2      `--.                    |
382 |            |       |      |   |                |                    |
383 |            |       |      |   `-----.      OpenBSD 6.3              |
384 |            |       |      *--NetBSD |          |            DragonFly 5.2.0
385 |            |       |      |   8.0   |          |                    |
386 |            |       |      |   |     |          |            DragonFly 5.2.1
387 |            |       |      |   |     |          |                    |
388 |            |       |      |   |     |          |            DragonFly 5.2.2
389 |         FreeBSD    |      |   |     *--NetBSD  |                    |
390 |           11.2     |      |   |         7.2    |                    |
391 |            |     macOS    |   |                |                    |
392 |            |     10.14    |   |            OpenBSD 6.4              |
393 |            |       |      |   |                |                    |
394 |            |       |      |   |                |            DragonFly 5.4.0
395 *--FreeBSD   |       |      |   |                |                    |
396 |   12.0     |       |      |   |                |            DragonFly 5.4.1
397 |     |      |       |      |   |            OpenBSD 6.5              |
398 |     |      |       |      |   |                |                    |
399 |     |      |       |      |  NetBSD            |                    |
400 |     |      |       |      |   8.1              |            DragonFly 5.6
401 |     |      |       |      |   |                |                    |
402 |     |      |       |      |   |                |            DragonFly 5.6.1
403 |     |   FreeBSD  macOS    |   |                |                    |
404 |     |     11.3   10.15    |   |                |                    |
405 |  FreeBSD   |       |      |   |            OpenBSD 6.6              |
406 |   12.1     |     macOS    |   `-------.        |                    |
407 |     |      |    10.15.1   |           |        |            DragonFly 5.6.2
408 |     |      |       |      *--NetBSD   |        |                    |
409 |     |      |       |      |   9.0     |        |                    |
410 |     |      |       |      |    |      |        |                    |
411 |     |      |       |      |    |      |        |            DragonFly 5.8
412 |     |      |       |      |    |      |        |                    |
413 |     |      |       |      |    |      |        |            DragonFly 5.6.3
414 |     |      |       |      |    |    NetBSD     |                    |
415 |     |      |       |      |    |     8.2       |                    |
416 |     |      |       |      |    |               |            DragonFly 5.8.1
417 |     |      |       |      |    |           OpenBSD 6.7              |
418 |     |   FreeBSD    |      |    |               |                    |
419 |     |     11.4     |      |    |               |                    |
420 |     |              |      |    |               |            DragonFly 5.8.2
421 |     |              |      |    |               |            DragonFly 5.8.3
422 |     |              |      |  NetBSD 9.1    OpenBSD 6.8              |
423 |  FreeBSD         macOS    |    |               |                    |
424 |   12.2            11      |    |               |                    |
425 |     |              |      |    |               |                    |
426 |     `------.       |      |    |               |                    |
427 |            |       |      |    |               |                    |
428 *--FreeBSD   |       |      |    |               |                    |
429 |   13.0     |       |      |  NetBSD 9.2    OpenBSD 6.9      DragonFly 6.0.0
430 |     |      |       |      |    |               |                    |
431 |     |      |       |      |    |               |            DragonFly 6.0.1
432 |     |      |       |      |    |               |                    |
433 |     |   FreeBSD  macOS    |    |           OpenBSD 7.0              |
434 |     |     12.3    12      |    |               |                    |
435 |     |      |       |      |    |               |            DragonFly 6.2.1
436 |     |      |       |      |    |           OpenBSD 7.1              |
437 |  FreeBSD   |       |      |    |               |                    |
438 |   13.1     |       |      |    |               |                    |
439 |     |      |       |      |    |               |            DragonFly 6.2.2
440 |     |      |       |      |  NetBSD 9.3        |                    |
441 |     |      |     macOS    |                OpenBSD 7.2              |
442 |     |      |      13      |                    |                    |
443 |     |   FreeBSD    |      |                    |                    |
444 |     |     12.4     |      |                    |                    |
445 |     |              |      |                    |            DragonFly 6.4.0
446 |     |              |      |                OpenBSD 7.3              |
447 |  FreeBSD           |      |                    |                    |
448 |   13.2             |      |                    |                    |
449 |                  macOS    |                    |                    |
450 |                   14      |                    |                    |
451 |                    |      |                    |                    |
452FreeBSD 14 -current   |  NetBSD -current   OpenBSD -current    DragonFly -current
453 |                    |      |                    |                    |
454 v                    v      v                    v                    v
455
456Time
457----------------
458
459Time tolerance +/- 6 months, depending on which book/article you read; if it
460was the announcement in Usenet or if it was available as tape.
461
462[44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
463	and John Quarterman. The Design and Implementation of
464	the 4.4BSD Operating System.
465[APL] Apple website [https://www.apple.com/macosx/]
466[BSDI] Berkeley Software Design, Inc.
467[DFB] DragonFlyBSD Project, The.
468[DOC] README, COPYRIGHT on tape.
469[FBD] FreeBSD Project, The.
470[KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
471	Volume 11, Info 4, April, 1987.
472[KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
473	comp.bugs.4bsd.ucb-fixes, June 15, 1988.
474[KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
475	Changes in the Kernel in 2.9BSD. Second Berkeley Software
476	Distribution UNIX Version 2.9, July, 1983.
477[NBD] NetBSD Project, The.
478[OBD] OpenBSD Project, The.
479[QCU] Salus, Peter H. A quarter century of UNIX.
480[SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
481[TUHS] The Unix Historical Society.  https://minnie.tuhs.org/Unix_History/.
482[USE] Usenet announcement.
483[WRS] Wind River Systems, Inc.
484[dmr] Dennis Ritchie, via E-Mail
485
486Multics                 1965
487UNIX                    Summer 1969
488				DEC PDP-7
489First   Edition         1971-11-03 [QCU]
490				DEC PDP-11/20, Assembler
491Second  Edition         1972-06-12 [QCU]
492				10 UNIX installations
493Third   Edition         1973-02-xx [QCU]
494				Pipes, 16 installations
495Fourth  Edition         1973-11-xx [QCU]
496				rewriting in C effected,
497                                above 30 installations
498Fifth   Edition         1974-06-xx [QCU]
499				above 50 installations
500Sixth   Edition         1975-05-xx [QCU]
501				port to DEC Vax
502Seventh Edition         1979-01-xx [QCU] 1979-01-10 [TUHS]
503				first portable UNIX
504Eighth  Edition         1985-02-xx [QCU]
505				VAX 11/750, VAX 11/780 [dmr]
506				descended from 4.1c BSD [dmr]
507				descended from 4.1 BSD [44B]
508			scooping-out and replacement of the character-device
509			and networking part by the streams mechanism
510
511Ninth   Edition         1986-09-xx [QCU]
512Tenth   Edition         1989-10-xx [QCU]
513
5141BSD                    late 1977
515			1978-01-16 [DOC]
516			1978-03-09 [QCU]
517				PDP-11, Pascal, ex(1)
518				30 free copies of 1BSD sent out
519				35 tapes sold for 50 USD [QCU]
5202BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
521				75 2BSD tapes shipped
5222.79BSD			1980-04-xx [TUHS]
5232.8BSD			1981-07-xx [KSJ]
524				First 2BSD with bootable V7 kernel plus
525				community fixes.
5262.8.1BSD		1982-01-xx [QCU]
527				set of performance improvements
5282.9BSD			1983-07-xx [KSJ]
5292.9.1BSD                1983-11-xx [TUHS]
5302.9BSD-Seismo		1985-08-xx [SMS]
5312.10BSD			1987-04-xx [KKK]
5322.10.1BSD		1989-01-xx [SMS]
5332.11BSD			1991-03-14 [SMS]
5342.11BSD rev #430	1999-12-13 [SMS]
535
53632V			1978-1[01]-xx [QCU] 1979-03-26 [TUHS]
5373BSD                    late 1979 [QCU] March 1980 [TUHS]
538				virtual memory, page replacement,
539                        	demand paging
5404.0BSD                  1980-10-xx
5414.1BSD                  1981-07-08 [DOC]
5424.1aBSD                 1982-04-xx
543				alpha release, 100 sites, networking [44B]
5444.1bBSD				internal release, fast filesystem [44B]
5454.1cBSD                 late 1982
546				beta release, IPC [44B]
5474.2BSD                  1983-09-xx [QCU]
548                        1983-08-03 [DOC]
5494.3BSD                  1986-06-xx [QCU]
550			1986-04-05 [KB], [DOC]
5514.3BSD Tahoe            1988-06-15 [QCU], [DOC]
5524.3BSD NET/1            1988-11-xx [QCU]
553                        1989-01-01 [DOC]
5544.3BSD Reno             1990-06-29 [QCU], [DOC]
5554.3BSD NET/2            1991-06-28 [QCU], [DOC]
556
557BSD/386 ALPHA		1991-12-xx [BSDI]
558				first code released to people outside BSDI
559386BSD 0.0              1992-02-xx [DOC]
560BSD/386 0.3.1	        1992-04-xx [BSDI] first ext. beta; B customers
561BSD/386 0.3.3		1992-06-xx [BSDI] first CDROM version
562386BSD 0.1              1992-07-28 [DOC]
5634.4BSD Alpha            1992-07-07
564BSD/386 0.9.3		1992-10-xx [BSDI]
565				first external gamma; G customers
566BSD/386 0.9.4		1992-12-xx [BSDI]
567				would have been 1.0 except for request
568				for preliminary injunction
569BSD/386 1.0 		1993-03-xx [BSDI]
570				injunction denied; first official release
571NetBSD 0.8              1993-04-20 [NBD]
5724.4BSD                  1993-06-01 [USE]
573NetBSD 0.9              1993-08-23 [NBD]
574FreeBSD 1.0		1993-11-01 [FBD]
575FreeBSD 1.0.2		1993-11-14 [FBD]
576				supersedes 1.0 13 days after release.
577BSD/386 1.1		1994-02-xx [BSDI]
5784.4BSD Lite             1994-03-01 [USE]
579FreeBSD 1.1		1994-05-07 [FBD]
580FreeBSD 1.1.5		1994-06-30 [FBD]
581FreeBSD 1.1.5.1		1994-07-05 [FBD]
582				supersedes 1.1.5 5 days after release.
583NetBSD 1.0              1994-10-26 [NBD]
584386BSD 1.0              1994-11-12 [USE]
585FreeBSD 2.0		1994-11-23 [FBD]
586BSD/OS 2.0		1995-01-xx [BSDI] 4.4 lite based
587FreeBSD 2.0.5		1995-06-10 [FBD]
588BSD/OS 2.0.1		1995-06-xx [BSDI]
5894.4BSD Lite Release 2	1995-06-xx [44B]
590				the true final distribution from the CSRG
591FreeBSD 2.1.0		1995-11-19 [FBD]
592NetBSD 1.1              1995-11-26 [NBD]
593BSD/OS 2.1		1996-01-xx [BSDI]
594FreeBSD 2.1.5		1996-07-14 [FBD]
595NetBSD 1.2              1996-10-04 [NBD]
596OpenBSD 2.0             1996-10-18 [OBD]
597FreeBSD 2.1.6		1996-11-16 [FBD]
598FreeBSD 2.1.6.1		1996-11-25 [FBD] (sendmail security release)
599Rhapsody		1997-xx-xx
600FreeBSD 2.1.7		1997-02-20 [FBD]
601BSD/OS 3.0		1997-02-xx [BSDI] 4.4 lite2 based
602FreeBSD 2.2.0		1997-03-16 [FBD]
603FreeBSD 2.2.1		1997-03-25 [FBD]
604FreeBSD 2.2.2		1997-05-16 [FBD]
605NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
606OpenBSD 2.1             1997-06-01 [OBD]
607FreeBSD 2.2.5		1997-10-22 [FBD]
608OpenBSD 2.2             1997-12-01 [OBD]
609NetBSD 1.3              1998-01-04 [NBD]
610FreeBSD 2.2.6		1998-03-25 [FBD]
611NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
612BSD/OS 3.1		1998-03-xx [BSDI]
613OpenBSD 2.3             1998-05-19 [OBD]
614NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
615FreeBSD 2.2.7		1998-07-22 [FBD]
616BSD/OS 4.0		1998-08-xx [BSDI]
617				2-lock MP support, ELF executables
618FreeBSD 3.0		1998-10-16 [FBD]
619				FreeBSD-3.0 is a snapshot from -current,
620				while 3.1 and 3.2 are from 3.x-stable which
621				was branched quite some time after 3.0-release
622FreeBSD 2.2.8           1998-11-29 [FBD]
623OpenBSD 2.4             1998-12-01 [OBD]
624NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
625FreeBSD 3.1		1999-02-15 [FBD]
626BSD/OS 4.0.1		1999-03-xx [BSDI]
627NetBSD 1.4              1999-05-12 [NBD]
628FreeBSD 3.2             1999-05-17 [FBD]
629OpenBSD 2.5             1999-05-19 [OBD]
630NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
631FreeBSD 3.3             1999-09-17 [FBD]
632OpenBSD 2.6             1999-12-01 [OBD]
633FreeBSD 3.4             1999-12-20 [FBD]
634BSD/OS 4.1		1999-12-xx [BSDI]
635FreeBSD 4.0             2000-03-13 [FBD]
636NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
637OpenBSD 2.7             2000-06-15 [OBD]
638FreeBSD 3.5		2000-06-24 [FBD]
639FreeBSD 4.1		2000-07-27 [FBD]
640FreeBSD 3.5.1		2000-07-28 [FBD]
641FreeBSD 4.1.1		2000-09-25 [FBD] (a network-only patch release)
642FreeBSD 4.2  		2000-11-21 [FBD]
643NetBSD 1.4.3		2000-11-25 [NBD] (patch release)
644BSD/OS 4.2		2000-11-29 [BSDI]
645OpenBSD 2.8		2000-12-01 [OBD]
646NetBSD 1.5              2000-12-06 [NBD]
647Mac OS X 10.0           2001-03-24 [APL]
648FreeBSD 4.3  		2001-04-20 [FBD]
649OpenBSD 2.9  		2001-06-01 [OBD]
650NetBSD 1.5.1		2001-07-11 [NBD] (patch release)
651NetBSD 1.5.2		2001-09-13 [NBD] (patch release)
652FreeBSD 4.4  		2001-09-18 [FBD]
653Mac OS X 10.1		2001-09-29 [APL]
654OpenBSD 3.0		2001-12-01 [OBD]
655FreeBSD 4.5  		2002-01-29 [FBD]
656BSD/OS 4.3		2002-03-14 [WRS]
657OpenBSD 3.1		2002-05-19 [OBD]
658FreeBSD 4.6  		2002-06-15 [FBD]
659NetBSD 1.5.3		2002-07-22 [NBD] (patch release)
660FreeBSD 4.6.2		2002-08-15 [FBD] (patch release)
661Mac OS X 10.2		2002-08-23 [APL]
662NetBSD 1.6		2002-09-14 [NBD]
663FreeBSD 4.7		2002-10-08 [FBD]
664OpenBSD 3.2		2002-11-01 [OBD]
665FreeBSD 5.0		2003-01-17 [FBD]
666				FreeBSD 5.0 is a separate branch off of
667				-current, similar to 3.0.
668FreeBSD 4.8		2003-04-03 [FBD]
669NetBSD 1.6.1		2003-04-21 [NBD] (patch release)
670OpenBSD 3.3		2003-05-01 [OBD]
671BSD/OS 5.0		2003-05-?? [WRS]
672FreeBSD 5.1		2003-06-09 [FBD]
673Mac OS X 10.3		2003-10-24 [APL]
674FreeBSD 4.9		2003-10-28 [FBD]
675BSD/OS 5.1 ISE		2003-10-?? [WRS] (final version)
676OpenBSD 3.4		2003-11-01 [OBD]
677FreeBSD 5.2		2004-01-12 [FBD]
678FreeBSD 5.2.1		2004-02-22 [FBD] (patch release)
679NetBSD 1.6.2		2004-03-01 [NBD] (patch release)
680OpenBSD 3.5		2004-04-01 [OBD]
681FreeBSD 4.10		2004-05-27 [FBD]
682DragonFly 1.0		2004-07-12 [DFB]
683OpenBSD 3.6		2004-10-29 [OBD]
684FreeBSD 5.3		2004-11-06 [FBD]
685NetBSD 2.0		2004-12-09 [NBD]
686FreeBSD 4.11		2005-01-25 [FBD]
687DragonFly 1.2.0		2005-04-08 [DFB]
688NetBSD 2.0.2		2005-04-14 [NBD] (security/critical release)
689Mac OS X 10.4		2005-04-29 [APL]
690FreeBSD 5.4		2005-05-09 [FBD]
691OpenBSD 3.7		2005-05-19 [OBD]
692NetBSD 2.0.3		2005-10-31 [NBD] (security/critical release)
693OpenBSD 3.8		2005-11-01 [OBD]
694FreeBSD 6.0		2005-11-01 [FBD]
695NetBSD 2.1		2005-11-02 [NBD]
696NetBSD 3.0		2005-12-23 [NBD]
697DragonFly 1.4.0		2006-01-08 [DFB]
698FreeBSD 2.2.9		2006-04-01 [FBD]
699OpenBSD 3.9		2006-05-01 [OBD]
700FreeBSD 6.1		2006-05-08 [FBD]
701FreeBSD 5.5		2006-05-25 [FBD]
702NetBSD 3.0.1		2006-07-24 [NBD] (security/critical release)
703DragonFly 1.6.0		2006-07-24 [DFB]
704OpenBSD 4.0		2006-11-01 [OBD]
705NetBSD 3.0.2		2006-11-04 [NBD] (security/critical release)
706NetBSD 3.1		2006-11-04 [NBD]
707FreeBSD 6.2		2007-01-15 [FBD]
708DragonFly 1.8.0		2007-01-30 [DFB]
709OpenBSD 4.1		2007-05-01 [OBD]
710DragonFly 1.10.0	2007-08-06 [DFB]
711Mac OS X 10.5		2007-10-26 [APL]
712OpenBSD 4.2		2007-11-01 [OBD]
713NetBSD 4.0		2007-12-19 [NBD]
714FreeBSD 6.3		2008-01-18 [FBD]
715DragonFly 1.12.0	2008-02-26 [DFB]
716FreeBSD 7.0		2008-02-27 [FBD]
717OpenBSD 4.3		2008-05-01 [OBD]
718DragonFly 2.0.0		2008-07-21 [DFB]
719OpenBSD 4.4		2008-11-01 [OBD]
720FreeBSD 6.4		2008-11-28 [FBD]
721FreeBSD 7.1		2009-01-04 [FBD]
722DragonFly 2.2.0		2009-02-17 [DFB]
723NetBSD 5.0		2009-04-29 [NBD]
724OpenBSD 4.5		2009-05-01 [OBD]
725FreeBSD 7.2		2009-05-04 [FBD]
726Mac OS X 10.6		2009-06-08 [APL]
727NetBSD 5.0.1		2009-08-02 [NBD] (security/critical release)
728DragonFly 2.4.0		2009-09-16 [DFB]
729OpenBSD 4.6		2009-10-18 [OBD]
730FreeBSD 8.0		2009-11-26 [FBD]
731NetBSD 5.0.2		2010-02-12 [NBD] (security/critical release)
732FreeBSD 7.3		2010-03-23 [FBD]
733DragonFly 2.6.0		2010-03-28 [DFB]
734OpenBSD 4.7		2010-05-19 [OBD]
735FreeBSD 8.1		2010-07-24 [FBD]
736DragonFly 2.8.2		2010-10-30 [DFB]
737OpenBSD 4.8		2010-11-01 [OBD]
738NetBSD 5.1		2010-11-19 [NBD]
739FreeBSD 7.4		2011-02-24 [FBD]
740FreeBSD 8.2		2011-02-24 [FBD]
741DragonFly 2.10.1	2011-04-26 [DFB]
742OpenBSD 4.9		2011-05-01 [OBD]
743Mac OS X 10.7		2011-07-20 [APL]
744OpenBSD 5.0		2011-11-01 [OBD]
745FreeBSD 9.0		2012-01-12 [FBD]
746NetBSD 5.1.2		2012-02-02 [NBD] (security/critical release)
747DragonFly 3.0.1		2012-02-21 [DFB]
748FreeBSD 8.3		2012-04-18 [FBD]
749OpenBSD 5.1		2012-05-01 [OBD]
750Mac OS X 10.8		2012-07-25 [APL]
751NetBSD 6.0		2012-10-17 [NBD]
752OpenBSD 5.2		2012-11-01 [OBD]
753DragonFly 3.2.1		2012-11-02 [DFB]
754NetBSD 5.2		2012-12-03 [NBD]
755NetBSD 6.0.1		2012-12-26 [NBD] (security/critical release)
756FreeBSD 9.1		2012-12-30 [FBD]
757DragonFly 3.4.1		2013-04-29 [DFB]
758OpenBSD 5.3		2013-05-01 [OBD]
759NetBSD 6.0.2		2013-05-18 [NBD] (security/critical release)
760NetBSD 6.1		2013-05-18 [NBD]
761FreeBSD 8.4		2013-06-07 [FBD]
762NetBSD 6.1.1		2013-08-22 [NBD]
763NetBSD 5.1.3		2013-09-29 [NBD]
764NetBSD 5.2.1		2013-09-29 [NBD]
765FreeBSD 9.2		2013-09-30 [FBD]
766NetBSD 6.0.3		2013-09-30 [NBD]
767NetBSD 6.1.2		2013-09-30 [NBD]
768Mac OS X 10.9		2013-10-22 [APL]
769OpenBSD 5.4		2013-11-01 [OBD]
770DragonFly 3.6.0 	2013-11-25 [DFB]
771FreeBSD 10.0		2014-01-20 [FBD]
772NetBSD 5.1.4		2014-01-25 [NBD]
773NetBSD 5.2.2		2014-01-25 [NBD]
774NetBSD 6.0.4		2014-01-25 [NBD]
775NetBSD 6.1.3		2014-01-25 [NBD]
776DragonFly 3.6.1 	2014-02-22 [DFB]
777DragonFly 3.6.2		2014-04-10 [DFB]
778NetBSD 6.0.5		2014-04-12 [NBD]
779NetBSD 6.1.4		2014-04-12 [NBD]
780OpenBSD 5.5		2014-05-01 [OBD]
781DragonFly 3.8.0		2014-06-04 [DFB]
782DragonFly 3.8.1		2014-06-16 [DFB]
783DragonFly 3.6.3		2014-06-17 [DFB]
784FreeBSD 9.3		2014-07-05 [FBD]
785DragonFly 3.8.2		2014-08-08 [DFB]
786NetBSD 6.0.6		2014-09-22 [NBD]
787NetBSD 6.1.5		2014-09-22 [NBD]
788Mac OS X 10.10		2014-10-16 [APL]
789OpenBSD 5.6		2014-11-01 [OBD]
790FreeBSD 10.1		2014-11-14 [FBD]
791DragonFly 4.0.1		2014-11-25 [DFB]
792DragonFly 4.0.2		2015-01-07 [DFB]
793DragonFly 4.0.3		2015-01-21 [DFB]
794DragonFly 4.0.4		2015-03-09 [DFB]
795DragonFly 4.0.5		2015-03-23 [DFB]
796OpenBSD 5.7		2015-05-01 [OBD]
797DragonFly 4.2.0		2015-06-29 [DFB]
798FreeBSD 10.2            2015-08-13 [FBD]
799NetBSD 7.0		2015-09-25 [NBD]
800OS X 10.11		2015-09-30 [APL]
801OpenBSD 5.8		2015-10-18 [OBD]
802DragonFly 4.4.1		2015-12-07 [DFB]
803OpenBSD 5.9		2016-03-29 [OBD]
804FreeBSD 10.3		2016-04-04 [FBD]
805NetBSD 7.0.1		2016-05-22 [NBD]
806DragonFly 4.6.0		2016-08-02 [DFB]
807OpenBSD 6.0		2016-09-01 [OBD]
808macOS 10.12		2016-09-20 [APL]
809FreeBSD 11.0		2016-10-10 [FBD]
810NetBSD 7.0.2		2016-10-21 [NBD]
811NetBSD 7.1		2017-03-11 [NBD]
812DragonFly 4.8.0		2017-03-27 [DFB]
813OpenBSD 6.1		2017-04-11 [OBD]
814FreeBSD 11.1		2017-07-26 [FBD]
815macOS 10.13		2017-09-25 [APL]
816FreeBSD 10.4		2017-10-03 [FBD]
817OpenBSD 6.2		2017-10-09 [OBD]
818DragonFly 5.0.0		2017-10-16 [DFB]
819DragonFly 5.0.1		2017-11-06 [DFB]
820DragonFly 5.0.2		2017-12-04 [DFB]
821NetBSD 7.1.1		2017-12-22 [NBD]
822NetBSD 7.1.2		2018-03-15 [NBD]
823OpenBSD 6.3		2018-04-02 [OBD]
824DragonFly 5.2.0		2018-04-10 [DFB]
825DragonFly 5.2.1		2018-05-20 [DFB]
826DragonFly 5.2.2		2018-06-18 [DFB]
827FreeBSD 11.2		2018-06-27 [FBD]
828NetBSD 8.0		2018-07-17 [NBD]
829NetBSD 7.2		2018-08-29 [NBD]
830macOS 10.14		2018-09-24 [APL]
831OpenBSD 6.4		2018-10-18 [OBD]
832DragonFly 5.4.0		2018-12-03 [DFB]
833FreeBSD 12.0		2018-12-11 [FBD]
834DragonFly 5.4.1		2018-12-24 [DFB]
835OpenBSD 6.5		2019-05-01 [OBD]
836NetBSD 8.1		2019-06-04 [NBD]
837DragonFly 5.6		2019-06-17 [DFB]
838DragonFly 5.6.1		2019-06-19 [DFB]
839FreeBSD 11.3		2019-07-09 [FBD]
840DragonFly 5.6.2		2019-08-11 [DFB]
841OpenBSD 6.6		2019-10-17 [OBD]
842macOS 10.15		2019-10-07 [APL]
843macOS 10.15.1		2019-10-29 [APL] (security/critical release)
844FreeBSD 12.1		2019-11-04 [FBD]
845NetBSD 9.0 		2020-02-14 [NBD]
846DragonFly 5.8 		2020-03-03 [DFB]
847DragonFly 5.6.3 	2020-03-11 [DFB]
848NetBSD 8.2 		2020-03-31 [NBD]
849DragonFly 5.8.1 	2020-05-06 [DFB]
850OpenBSD 6.7		2020-05-19 [OBD]
851FreeBSD 11.4		2020-06-16 [FBD]
852DragonFly 5.8.2 	2020-09-23 [DFB]
853DragonFly 5.8.3 	2020-09-24 [DFB]
854OpenBSD 6.8		2020-10-18 [OBD]
855NetBSD 9.1 		2020-10-18 [NBD]
856FreeBSD 12.2		2020-10-27 [FBD]
857macOS 11		2020-11-19 [APL]
858FreeBSD 13.0		2021-04-13 [FBD]
859OpenBSD 6.9		2021-05-01 [OBD]
860DragonFly 6.0		2021-05-08 [DFB]
861NetBSD 9.2		2021-05-12 [NBD]
862DragonFly 6.0.1		2021-10-12 [DFB]
863OpenBSD 7.0		2021-10-14 [OBD]
864macOS 12		2021-10-25 [APL]
865FreeBSD 12.3		2021-12-01 [FBD]
866DragonFly 6.2.1		2022-01-09 [DFB]
867OpenBSD 7.1		2022-04-21 [OBD]
868FreeBSD 13.1		2022-05-17 [FBD]
869DragonFly 6.2.2		2022-06-09 [DFB]
870NetBSD 9.3		2022-08-04 [NBD]
871OpenBSD 7.2		2022-10-20 [OBD]
872macOS 13		2022-10-24 [APL]
873FreeBSD 12.4		2022-12-05 [FBD]
874DragonFly 6.4		2022-12-30 [DFB]
875OpenBSD 7.3		2023-04-10 [OBD]
876FreeBSD 13.2		2023-04-11 [FBD]
877macOS 14		2023-09-26 [APL]
878
879Bibliography
880------------------------
881
882Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
883Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
884System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
885
886Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
887Company, Inc., 1994. ISBN 0-201-54777-5
888
889McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
890Quarterman. The Design and Implementation of the 4.4BSD Operating
891System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
892
893McKusick, Marshall Kirk, George Neville-Neil. The Design and
894Implementation of the FreeBSD Operating System.
895Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
896
897McKusick, Marshall Kirk, George Neville-Neil, Robert Watson. The
898Design and Implementation of the FreeBSD Operating System, 2nd Edition.
899Pearson Education, Inc., 2014. ISBN 0-321-96897-2
900
901Doug McIlroy. Research Unix Reader.
902
903Michael G. Brown. The Role of BSD in the Development of Unix.
904Presented to the Tasmanian Unix Special Interest Group of the
905Australian Computer Society, Hobart, August 1993.
906
907Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
908URL: https://web.archive.org/web/20081230094857/http://www.byte.com/art/9410/sec8/art3.htm
909
910Andreas Klemm, Lars Köller. If you're going to San Francisco ...
911Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
912
913FreeBSD Release Information
914URL: https://www.FreeBSD.org/releases/
915
916FreeBSD Manual Pages
917URL: https://man.freebsd.org/cgi/man.cgi
918
919UNIX history graphing project
920URL: https://minnie.tuhs.org/Unix_History/index.html
921
922UNIX history
923URL: https://www.levenez.com/unix/
924
925James Howard: The BSD Family Tree
926URL: https://web.archive.org/web/20090427195917/http://ezine.daemonnews.org/200104/bsd_family.html
927("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
928
929
930Acknowledgments
931---------------
932
933Josh Gilliam for suggestions, bug fixes, and finding very old
934original BSD announcements from Usenet or tapes.
935
936Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
937
938--
939Copyright (c) 1997-2023 Wolfram Schneider <wosch@FreeBSD.org>
940URL: https://cgit.freebsd.org/src/tree/share/misc/bsd-family-tree
941