| blob | 68391bcefe80e3877841b0a499203d2372c59020 |
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 2.7.9BSD
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 | v `-|------|-----------------|---------------------.
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 | | | | OpenBSD 4.2 |
216 | V | | | |
217 FreeBSD 7 -current | NetBSD -current OpenBSD -current |
218 | | | | |
219 v v v v v
221 Time
222 ----------------
224 Time tolerance +/- 6 months, depending on which book/article you read; if it
225 was the announcement in Usenet or if it was available as tape.
227 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
228 and John Quarterman. The Design and Implementation of
229 the 4.4BSD Operating System.
230 [APL] Apple website [http://www.apple.com/macosx/]
231 [BSDI] Berkeley Software Design, Inc.
232 [DFB] DragonFlyBSD Project, The.
233 [DOC] README, COPYRIGHT on tape.
234 [FBD] FreeBSD Project, The.
235 [KB] Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
236 Volume 11, Info 4, April, 1987.
237 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
238 comp.bugs.4bsd.ucb-fixes, June 15, 1988.
239 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
240 Changes in the Kernel in 2.9BSD. Second Berkeley Software
241 Distribution UNIX Version 2.9, July, 1983.
242 [NBD] NetBSD Project, The.
243 [OBD] OpenBSD Project, The.
244 [QCU] Salus, Peter H. A quarter century of UNIX.
245 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
246 [USE] Usenet announcement.
247 [WRS] Wind River Systems, Inc.
248 [dmr] Dennis Ritchie, via E-Mail
250 Multics 1965
251 UNIX Summer 1969
252 DEC PDP-7
253 First Edition 1971-11-03 [QCU]
254 DEC PDP-11/20, Assembler
255 Second Edition 1972-06-12 [QCU]
256 10 UNIX installations
257 Third Edition 1973-02-xx [QCU]
258 Pipes, 16 installations
259 Fourth Edition 1973-11-xx [QCU]
260 rewriting in C effected,
261 above 30 installations
262 Fifth Edition 1974-06-xx [QCU]
263 above 50 installations
264 Sixth Edition 1975-05-xx [QCU]
265 port to DEC Vax
266 Seventh Edition 1979-01-xx [QCU]
267 first portable UNIX
268 Eighth Edition 1985-02-xx [QCU]
269 VAX 11/750, VAX 11/780 [dmr]
270 descended from 4.1c BSD [dmr]
271 descended from 4.1 BSD [44B]
272 scooping-out and replacement of the character-device
273 and networking part by the streams mechanism
275 Ninth Edition 1986-09-xx [QCU]
276 Tenth Edition 1989-10-xx [QCU]
278 1BSD late 1977
279 1978-03-09 [QCU]
280 PDP-11, Pascal, ex(1)
281 30 free copies of 1BSD sent out
282 35 tapes sold for 50 USD [QCU]
283 2BSD mid 1978 [QCU]
284 75 2BSD tapes shipped
285 2.7.9BSD ?? [SMS]
286 2.8BSD 1981-07-xx [KSJ]
288 2.8.1BSD 1982-01-xx [QCU]
289 set of performance improvements
290 2.9BSD 1983-07-xx [KSJ]
291 2.9.1BSD 1983-11-xx
292 2.9BSD-Seismo 1985-08-xx [SMS]
293 2.10BSD 1987-04-xx [KKK]
294 2.10.1BSD 1989-01-xx [SMS]
295 2.11BSD 1992-02-xx [SMS]
296 2.11BSD rev #430 1999-12-13 [SMS]
298 32V 1978-1[01]-xx [QCU]
299 3BSD late 1979 [QCU]
300 virtual memory, page replacement,
301 demand paging
302 4.0BSD 1980-10-xx
303 4.1BSD 1981-07-08 [DOC]
304 4.1aBSD 1982-04-xx
305 alpha release, 100 sites, networking [44B]
306 4.1bBSD internal release, fast filesystem [44B]
307 4.1cBSD late 1982
308 beta release, IPC [44B]
309 4.2BSD 1983-09-xx [QCU]
310 1983-08-03 [DOC]
311 4.3BSD 1986-06-xx [QCU]
312 1986-04-05 [KB], [DOC]
313 4.3BSD Tahoe 1988-06-15 [QCU], [DOC]
314 4.3BSD NET/1 1988-11-xx [QCU]
315 1989-01-01 [DOC]
316 4.3BSD Reno 1990-06-29 [QCU], [DOC]
317 4.3BSD NET/2 1991-06-28 [QCU], [DOC]
319 BSD/386 ALPHA 1991-12-xx [BSDI]
320 first code released to people outside BSDI
321 386BSD 0.0 1992-02-xx [DOC]
322 BSD/386 0.3.1 1992-04-xx [BSDI] first ext. beta; B customers
323 BSD/386 0.3.3 1992-06-xx [BSDI] first CDROM version
324 386BSD 0.1 1992-07-28 [DOC]
325 4.4BSD Alpha 1992-07-07
326 BSD/386 0.9.3 1992-10-xx [BSDI]
327 first external gamma; G customers
328 BSD/386 0.9.4 1992-12-xx [BSDI]
329 would have been 1.0 except for request
330 for preliminary injunction
331 BSD/386 1.0 1993-03-xx [BSDI]
332 injunction denied; first official release
333 NetBSD 0.8 1993-04-20 [NBD]
334 4.4BSD 1993-06-01 [USE]
335 NetBSD 0.9 1993-08-23 [NBD]
336 FreeBSD 1.0 1993-11-01 [FBD]
337 FreeBSD 1.0.2 1993-11-14 [FBD]
338 supersedes 1.0 13 days after release.
339 BSD/386 1.1 1994-02-xx [BSDI]
340 4.4BSD Lite 1994-03-01 [USE]
341 FreeBSD 1.1 1994-05-07 [FBD]
342 FreeBSD 1.1.5 1994-06-30 [FBD]
343 FreeBSD 1.1.5.1 1994-07-05 [FBD]
344 supersedes 1.1.5 5 days after release.
345 NetBSD 1.0 1994-10-26 [NBD]
346 386BSD 1.0 1994-11-12 [USE]
347 FreeBSD 2.0 1994-11-23 [FBD]
348 BSD/OS 2.0 1995-01-xx [BSDI] 4.4 lite based
349 FreeBSD 2.0.5 1995-06-10 [FBD]
350 BSD/OS 2.0.1 1995-06-xx [BSDI]
351 4.4BSD Lite Release 2 1995-06-xx [44B]
352 the true final distribution from the CSRG
353 FreeBSD 2.1.0 1995-11-19 [FBD]
354 NetBSD 1.1 1995-11-26 [NBD]
355 BSD/OS 2.1 1996-01-xx [BSDI]
356 FreeBSD 2.1.5 1996-07-14 [FBD]
357 NetBSD 1.2 1996-10-04 [NBD]
358 OpenBSD 2.0 1996-10-18 [OBD]
359 FreeBSD 2.1.6 1996-11-16 [FBD]
360 FreeBSD 2.1.6.1 1996-11-25 [FBD] (sendmail security release)
361 Rhapsody 1997-xx-xx
362 FreeBSD 2.1.7 1997-02-20 [FBD]
363 BSD/OS 3.0 1997-02-xx [BSDI] 4.4 lite2 based
364 FreeBSD 2.2.0 1997-03-16 [FBD]
365 FreeBSD 2.2.1 1997-03-25 [FBD]
366 FreeBSD 2.2.2 1997-05-16 [FBD]
367 NetBSD 1.2.1 1997-05-20 [NBD] (patch release)
368 OpenBSD 2.1 1997-06-01 [OBD]
369 FreeBSD 2.2.5 1997-10-22 [FBD]
370 OpenBSD 2.2 1997-12-01 [OBD]
371 NetBSD 1.3 1998-01-04 [NBD]
372 FreeBSD 2.2.6 1998-03-25 [FBD]
373 NetBSD 1.3.1 1998-03-09 [NBD] (patch release)
374 BSD/OS 3.1 1998-03-xx [BSDI]
375 OpenBSD 2.3 1998-05-19 [OBD]
376 NetBSD 1.3.2 1998-05-29 [NBD] (patch release)
377 FreeBSD 2.2.7 1998-07-22 [FBD]
378 BSD/OS 4.0 1998-08-xx [BSDI]
379 2-lock MP support, ELF executables
380 FreeBSD 3.0 1998-10-16 [FBD]
381 FreeBSD-3.0 is a snapshot from -current,
382 while 3.1 and 3.2 are from 3.x-stable which
383 was branched quite some time after 3.0-release
384 FreeBSD 2.2.8 1998-11-29 [FBD]
385 OpenBSD 2.4 1998-12-01 [OBD]
386 NetBSD 1.3.3 1998-12-23 [NBD] (patch release)
387 FreeBSD 3.1 1999-02-15 [FBD]
388 BSD/OS 4.0.1 1999-03-xx [BSDI]
389 NetBSD 1.4 1999-05-12 [NBD]
390 FreeBSD 3.2 1999-05-17 [FBD]
391 OpenBSD 2.5 1999-05-19 [OBD]
392 NetBSD 1.4.1 1999-08-26 [NBD] (patch release)
393 FreeBSD 3.3 1999-09-17 [FBD]
394 OpenBSD 2.6 1999-12-01 [OBD]
395 FreeBSD 3.4 1999-12-20 [FBD]
396 BSD/OS 4.1 1999-12-xx [BSDI]
397 FreeBSD 4.0 2000-03-13 [FBD]
398 NetBSD 1.4.2 2000-03-19 [NBD] (patch release)
399 OpenBSD 2.7 2000-06-15 [OBD]
400 FreeBSD 3.5 2000-06-24 [FBD]
401 FreeBSD 4.1 2000-07-27 [FBD]
402 FreeBSD 3.5.1 2000-07-28 [FBD]
403 FreeBSD 4.1.1 2000-09-25 [FBD] (a network-only patch release)
404 FreeBSD 4.2 2000-11-21 [FBD]
405 NetBSD 1.4.3 2000-11-25 [NBD] (patch release)
406 BSD/OS 4.2 2000-11-29 [BSDI]
407 OpenBSD 2.8 2000-12-01 [OBD]
408 NetBSD 1.5 2000-12-06 [NBD]
409 Mac OS X 10.0 2001-03-24 [APL]
410 FreeBSD 4.3 2001-04-20 [FBD]
411 OpenBSD 2.9 2001-06-01 [OBD]
412 NetBSD 1.5.1 2001-07-11 [NBD] (patch release)
413 NetBSD 1.5.2 2001-09-13 [NBD] (patch release)
414 FreeBSD 4.4 2001-09-18 [FBD]
415 Mac OS X 10.1 2001-09-29 [APL]
416 OpenBSD 3.0 2001-12-01 [OBD]
417 FreeBSD 4.5 2002-01-29 [FBD]
418 BSD/OS 4.3 2002-03-14 [WRS]
419 OpenBSD 3.1 2002-05-19 [OBD]
420 FreeBSD 4.6 2002-06-15 [FBD]
421 NetBSD 1.5.3 2002-07-22 [NBD] (patch release)
422 FreeBSD 4.6.2 2002-08-15 [FBD] (patch release)
423 Mac OS X 10.2 2002-08-23 [APL]
424 NetBSD 1.6 2002-09-14 [NBD]
425 FreeBSD 4.7 2002-10-08 [FBD]
426 OpenBSD 3.2 2002-11-01 [OBD]
427 FreeBSD 5.0 2003-01-17 [FBD]
428 FreeBSD 5.0 is a separate branch off of
429 -current, similar to 3.0.
430 FreeBSD 4.8 2003-04-03 [FBD]
431 NetBSD 1.6.1 2003-04-21 [NBD] (patch release)
432 OpenBSD 3.3 2003-05-01 [OBD]
433 BSD/OS 5.0 2003-05-?? [WRS]
434 FreeBSD 5.1 2003-06-09 [FBD]
435 Mac OS X 10.3 2003-10-24 [APL]
436 FreeBSD 4.9 2003-10-28 [FBD]
437 BSD/OS 5.1 ISE 2003-10-?? [WRS] (final version)
438 OpenBSD 3.4 2003-11-01 [OBD]
439 FreeBSD 5.2 2004-01-12 [FBD]
440 FreeBSD 5.2.1 2004-02-22 [FBD] (patch release)
441 NetBSD 1.6.2 2004-03-01 [NBD] (patch release)
442 OpenBSD 3.5 2004-04-01 [OBD]
443 FreeBSD 4.10 2004-05-27 [FBD]
444 DragonFly 1.0 2004-07-12 [DFB]
445 OpenBSD 3.6 2004-10-29 [OBD]
446 FreeBSD 5.3 2004-11-06 [FBD]
447 NetBSD 2.0 2004-12-09 [NBD]
448 FreeBSD 4.11 2005-01-25 [FBD]
449 DragonFly 1.2.0 2005-04-08 [DFB]
450 NetBSD 2.0.2 2005-04-14 [NBD] (security/critical release)
451 Mac OS X 10.4 2005-04-29 [APL]
452 FreeBSD 5.4 2005-05-09 [FBD]
453 OpenBSD 3.7 2005-05-19 [OBD]
454 NetBSD 2.0.3 2005-10-31 [NBD] (security/critical release)
455 OpenBSD 3.8 2005-11-01 [OBD]
456 FreeBSD 6.0 2005-11-01 [FBD]
457 NetBSD 2.1 2005-11-02 [NBD]
458 NetBSD 3.0 2005-12-23 [NBD]
459 DragonFly 1.4.0 2006-01-08 [DFB]
460 OpenBSD 3.9 2006-05-01 [OBD]
461 FreeBSD 6.1 2006-05-08 [FBD]
462 FreeBSD 5.5 2006-05-25 [FBD]
463 NetBSD 3.0.1 2006-07-24 [NBD] (security/critical release)
464 DragonFly 1.6.0 2006-07-24 [DFB]
465 OpenBSD 4.0 2006-11-01 [OBD]
466 NetBSD 3.0.2 2006-11-04 [NBD] (security/critical release)
467 NetBSD 3.1 2006-11-04 [NBD]
468 FreeBSD 6.2 2007-01-15 [FBD]
469 DragonFly 1.8.0 2007-01-30 [DFB]
470 OpenBSD 4.1 2007-05-01 [OBD]
471 DragonFly 1.10.0 2007-08-06 [DFB]
472 OpenBSD 4.2 2007-11-01 [OBD]
474 Bibliography
475 ------------------------
477 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
478 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
479 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
481 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
482 Company, Inc., 1994. ISBN 0-201-54777-5
484 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
485 Quarterman. The Design and Implementation of the 4.4BSD Operating
486 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
488 McKusick, Marshall Kirk, George Neville-Neil. The Design and
489 Implementation of the FreeBSD Operating System.
490 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
492 Doug McIlroy. Research Unix Reader.
494 Michael G. Brown. The Role of BSD in the Development of Unix.
495 Presented to the Tasmanian Unix Special Interest Group of the
496 Australian Computer Society, Hobart, August 1993.
498 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
499 URL: http://www.byte.com/art/9410/sec8/art3.htm
501 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
502 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
504 BSD Release Announcements collection.
505 URL: http://www.de.FreeBSD.org/de/ftp/releases/
507 BSD Hypertext Man Pages
508 URL: http://www.FreeBSD.org/cgi/man.cgi
510 UNIX history graphing project
511 URL: http://minnie.tuhs.org/Unix_History/index.html
513 UNIX history
514 URL: http://www.levenez.com/unix/
516 James Howard: The BSD Family Tree
517 URL: http://ezine.daemonnews.org/200104/bsd_family.html
518 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
521 Acknowledgments
522 ---------------
524 Josh Gilliam for suggestions, bug fixes, and finding very old
525 original BSD announcements from Usenet or tapes.
527 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
529 --
530 Copyright (c) 1997-2007 Wolfram Schneider <wosch@FreeBSD.ORG>
531 URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree
533 $FreeBSD: src/share/misc/bsd-family-tree,v 1.116 2007/11/02 19:25:06 maxim Exp $
534 $DragonFly: src/share/misc/bsd-family-tree,v 1.13 2007/11/05 11:17:15 hasso Exp $