1 The UNIX system family tree: Research and BSD
2 ---------------------------------------------
14 Sixth Edition (V6) -----*
18 Seventh Edition (V7) |
22 \ 2BSD---------------*
30 4.1BSD --------------> 2.8BSD
32 4.1aBSD -----------\ |
36 *------ 4.1cBSD --------------> 2.9BSD
38 Eighth Edition | 2.9BSD-Seismo
40 +----<--- 4.2BSD 2.9.1BSD
42 +----<--- 4.3BSD -------------> 2.10BSD
44 Ninth Edition | / 2.10.1BSD
45 | 4.3BSD Tahoe-----+ |
55 *---------- 4.3BSD NET/2 -------------------+-------------*
57 386BSD 0.0 | | BSD/386 ALPHA
59 386BSD 0.1 ------------>+ | BSD/386 0.3.[13]
61 | 386BSD 1.0 | | BSD/386 0.9.[34]
64 | | 4.4BSD-Encumbered | |
65 | NetBSD 0.8 | BSD/386 1.0
67 FreeBSD 1.0 NetBSD 0.9 | BSD/386 1.1
68 | | .----- 4.4BSD Lite |
69 FreeBSD 1.1 | / / | \ |
71 FreeBSD 1.1.5 .---|--------' / | \ |
73 FreeBSD 1.1.5.1 / | / | \ |
74 | / NetBSD 1.0 <-' | \ |
76 FreeBSD 2.0 <--' | | BSD/OS 2.0
78 FreeBSD 2.0.5 \ | BSD/OS 2.0.1
79 | .-----\------------- 4.4BSD Lite2 |
81 | | .-----|------Rhapsody | | | |
82 | | | | NetBSD 1.3 | | |
83 | | | | OpenBSD 2.3 | |
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 |
91 | FreeBSD 2.1.6.1 | | | \ | |
93 | FreeBSD 2.1.7 | | | | | |
94 | | | | | NetBSD 1.2.1 | |
95 | FreeBSD 2.1.7.1 | | | | |
98 *-FreeBSD 2.2 | | | | |
100 | FreeBSD 2.2.1 | | | | |
102 | FreeBSD 2.2.2 | | | OpenBSD 2.1 |
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
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 |
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 | |
131 | FreeBSD 3.5 | | | | | OpenBSD 2.7 |
133 | FreeBSD 3.5.1 | | | | | | |
135 *---FreeBSD 4.1 | | | | | | |
137 | FreeBSD 4.1.1 | | / | | | |
139 | FreeBSD 4.2 Darwin/ | NetBSD 1.4.3 | |
140 | | Mac OS X | OpenBSD 2.8 BSD/OS 4.2
143 | | 10.0 NetBSD 1.5 | |
144 | FreeBSD 4.3 | | | | |
145 | | | | | OpenBSD 2.9 |
146 | | | | NetBSD 1.5.1 | |
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 | | |
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
163 | FreeBSD 4.9 | | | | OpenBSD 3.4 BSD/OS 5.1 ISE
165 | | | | | NetBSD 1.6.2 |
167 | | | | | | OpenBSD 3.5
169 | FreeBSD 4.10 | | | |
171 | FreeBSD 4.11 | | | |
173 | `-|------|-----------------|---------------------.
177 FreeBSD 5.1 | | | DragonFly 1.0
179 | ----- Mac OS X | | |
183 | FreeBSD 5.2.1 | | | |
185 *-------FreeBSD 5.3 | | | |
186 | | | | OpenBSD 3.6 |
188 | | | | | | | DragonFly 1.2.0
189 | | Mac OS X | | NetBSD 2.0.2 | |
191 | FreeBSD 5.4 | | | | | |
192 | | | | | | OpenBSD 3.7 |
193 | | | | | NetBSD 2.0.3 | |
195 *--FreeBSD | | | | v OpenBSD 3.8 |
198 | | | | | NetBSD 2.1 | |
200 | | | | NetBSD 3.0 | |
201 | | | | | | | | DragonFly 1.4.0
202 | | | | | | | OpenBSD 3.9 |
203 | FreeBSD | | | | | | |
205 | | FreeBSD 5.5 | | | | | |
206 | | | | | NetBSD 3.0.1 | DragonFly 1.6.0
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
217 | | | | OpenBSD 4.2 |
219 | FreeBSD 6.3 | | | |
221 *--FreeBSD | | | | DragonFly 1.12.0
223 | | | | | OpenBSD 4.3 |
224 | | | | | | DragonFly 2.0.0
225 | | FreeBSD | | OpenBSD 4.4 |
228 | FreeBSD 7.1 | | | |
229 | | | | | DragonFly 2.2.0
230 | FreeBSD 7.2 | NetBSD 5.0 OpenBSD 4.5 |
232 | | | | | DragonFly 2.4.0
233 | | | | OpenBSD 4.6 |
238 | | 7.3 | | | DragonFly 2.6.0
239 | | | | OpenBSD 4.7 |
242 | | | | | DragonFly 2.8.0
243 | | | | OpenBSD 4.8 |
246 FreeBSD 9 -current | NetBSD -current OpenBSD -current |
253 Time tolerance +/- 6 months, depending on which book/article you read; if it
254 was the announcement in Usenet or if it was available as tape.
256 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
257 and John Quarterman. The Design and Implementation of
258 the 4.4BSD Operating System.
259 [APL] Apple website [http://www.apple.com/macosx/]
260 [BSDI] Berkeley Software Design, Inc.
261 [DFB] DragonFlyBSD Project, The.
262 [DOC] README, COPYRIGHT on tape.
263 [FBD] FreeBSD Project, The.
264 [KB] Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
265 Volume 11, Info 4, April, 1987.
266 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
267 comp.bugs.4bsd.ucb-fixes, June 15, 1988.
268 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
269 Changes in the Kernel in 2.9BSD. Second Berkeley Software
270 Distribution UNIX Version 2.9, July, 1983.
271 [NBD] NetBSD Project, The.
272 [OBD] OpenBSD Project, The.
273 [QCU] Salus, Peter H. A quarter century of UNIX.
274 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
275 [TUHS] The Unix Historical Society. http://minnie.tuhs.org/Unix_History/.
276 [USE] Usenet announcement.
277 [WRS] Wind River Systems, Inc.
278 [dmr] Dennis Ritchie, via E-Mail
283 First Edition 1971-11-03 [QCU]
284 DEC PDP-11/20, Assembler
285 Second Edition 1972-06-12 [QCU]
286 10 UNIX installations
287 Third Edition 1973-02-xx [QCU]
288 Pipes, 16 installations
289 Fourth Edition 1973-11-xx [QCU]
290 rewriting in C effected,
291 above 30 installations
292 Fifth Edition 1974-06-xx [QCU]
293 above 50 installations
294 Sixth Edition 1975-05-xx [QCU]
296 Seventh Edition 1979-01-xx [QCU]
298 Eighth Edition 1985-02-xx [QCU]
299 VAX 11/750, VAX 11/780 [dmr]
300 descended from 4.1c BSD [dmr]
301 descended from 4.1 BSD [44B]
302 scooping-out and replacement of the character-device
303 and networking part by the streams mechanism
305 Ninth Edition 1986-09-xx [QCU]
306 Tenth Edition 1989-10-xx [QCU]
310 PDP-11, Pascal, ex(1)
311 30 free copies of 1BSD sent out
312 35 tapes sold for 50 USD [QCU]
313 2BSD mid 1978 [QCU] 1979-05-10 [TUHS]
314 75 2BSD tapes shipped
315 2.79BSD 1980-04-xx [TUHS]
316 2.8BSD 1981-07-xx [KSJ]
318 2.8.1BSD 1982-01-xx [QCU]
319 set of performance improvements
320 2.9BSD 1983-07-xx [KSJ]
321 2.9.1BSD 1983-11-xx [TUHS]
322 2.9BSD-Seismo 1985-08-xx [SMS]
323 2.10BSD 1987-04-xx [KKK]
324 2.10.1BSD 1989-01-xx [SMS]
325 2.11BSD 1992-02-xx [SMS]
326 2.11BSD rev #430 1999-12-13 [SMS]
328 32V 1978-1[01]-xx [QCU]
329 3BSD late 1979 [QCU] March 1980 [TUHS]
330 virtual memory, page replacement,
333 4.1BSD 1981-07-08 [DOC]
335 alpha release, 100 sites, networking [44B]
336 4.1bBSD internal release, fast filesystem [44B]
338 beta release, IPC [44B]
339 4.2BSD 1983-09-xx [QCU]
341 4.3BSD 1986-06-xx [QCU]
342 1986-04-05 [KB], [DOC]
343 4.3BSD Tahoe 1988-06-15 [QCU], [DOC]
344 4.3BSD NET/1 1988-11-xx [QCU]
346 4.3BSD Reno 1990-06-29 [QCU], [DOC]
347 4.3BSD NET/2 1991-06-28 [QCU], [DOC]
349 BSD/386 ALPHA 1991-12-xx [BSDI]
350 first code released to people outside BSDI
351 386BSD 0.0 1992-02-xx [DOC]
352 BSD/386 0.3.1 1992-04-xx [BSDI] first ext. beta; B customers
353 BSD/386 0.3.3 1992-06-xx [BSDI] first CDROM version
354 386BSD 0.1 1992-07-28 [DOC]
355 4.4BSD Alpha 1992-07-07
356 BSD/386 0.9.3 1992-10-xx [BSDI]
357 first external gamma; G customers
358 BSD/386 0.9.4 1992-12-xx [BSDI]
359 would have been 1.0 except for request
360 for preliminary injunction
361 BSD/386 1.0 1993-03-xx [BSDI]
362 injunction denied; first official release
363 NetBSD 0.8 1993-04-20 [NBD]
364 4.4BSD 1993-06-01 [USE]
365 NetBSD 0.9 1993-08-23 [NBD]
366 FreeBSD 1.0 1993-11-01 [FBD]
367 FreeBSD 1.0.2 1993-11-14 [FBD]
368 supersedes 1.0 13 days after release.
369 BSD/386 1.1 1994-02-xx [BSDI]
370 4.4BSD Lite 1994-03-01 [USE]
371 FreeBSD 1.1 1994-05-07 [FBD]
372 FreeBSD 1.1.5 1994-06-30 [FBD]
373 FreeBSD 1.1.5.1 1994-07-05 [FBD]
374 supersedes 1.1.5 5 days after release.
375 NetBSD 1.0 1994-10-26 [NBD]
376 386BSD 1.0 1994-11-12 [USE]
377 FreeBSD 2.0 1994-11-23 [FBD]
378 BSD/OS 2.0 1995-01-xx [BSDI] 4.4 lite based
379 FreeBSD 2.0.5 1995-06-10 [FBD]
380 BSD/OS 2.0.1 1995-06-xx [BSDI]
381 4.4BSD Lite Release 2 1995-06-xx [44B]
382 the true final distribution from the CSRG
383 FreeBSD 2.1.0 1995-11-19 [FBD]
384 NetBSD 1.1 1995-11-26 [NBD]
385 BSD/OS 2.1 1996-01-xx [BSDI]
386 FreeBSD 2.1.5 1996-07-14 [FBD]
387 NetBSD 1.2 1996-10-04 [NBD]
388 OpenBSD 2.0 1996-10-18 [OBD]
389 FreeBSD 2.1.6 1996-11-16 [FBD]
390 FreeBSD 2.1.6.1 1996-11-25 [FBD] (sendmail security release)
392 FreeBSD 2.1.7 1997-02-20 [FBD]
393 BSD/OS 3.0 1997-02-xx [BSDI] 4.4 lite2 based
394 FreeBSD 2.2.0 1997-03-16 [FBD]
395 FreeBSD 2.2.1 1997-03-25 [FBD]
396 FreeBSD 2.2.2 1997-05-16 [FBD]
397 NetBSD 1.2.1 1997-05-20 [NBD] (patch release)
398 OpenBSD 2.1 1997-06-01 [OBD]
399 FreeBSD 2.2.5 1997-10-22 [FBD]
400 OpenBSD 2.2 1997-12-01 [OBD]
401 NetBSD 1.3 1998-01-04 [NBD]
402 FreeBSD 2.2.6 1998-03-25 [FBD]
403 NetBSD 1.3.1 1998-03-09 [NBD] (patch release)
404 BSD/OS 3.1 1998-03-xx [BSDI]
405 OpenBSD 2.3 1998-05-19 [OBD]
406 NetBSD 1.3.2 1998-05-29 [NBD] (patch release)
407 FreeBSD 2.2.7 1998-07-22 [FBD]
408 BSD/OS 4.0 1998-08-xx [BSDI]
409 2-lock MP support, ELF executables
410 FreeBSD 3.0 1998-10-16 [FBD]
411 FreeBSD-3.0 is a snapshot from -current,
412 while 3.1 and 3.2 are from 3.x-stable which
413 was branched quite some time after 3.0-release
414 FreeBSD 2.2.8 1998-11-29 [FBD]
415 OpenBSD 2.4 1998-12-01 [OBD]
416 NetBSD 1.3.3 1998-12-23 [NBD] (patch release)
417 FreeBSD 3.1 1999-02-15 [FBD]
418 BSD/OS 4.0.1 1999-03-xx [BSDI]
419 NetBSD 1.4 1999-05-12 [NBD]
420 FreeBSD 3.2 1999-05-17 [FBD]
421 OpenBSD 2.5 1999-05-19 [OBD]
422 NetBSD 1.4.1 1999-08-26 [NBD] (patch release)
423 FreeBSD 3.3 1999-09-17 [FBD]
424 OpenBSD 2.6 1999-12-01 [OBD]
425 FreeBSD 3.4 1999-12-20 [FBD]
426 BSD/OS 4.1 1999-12-xx [BSDI]
427 FreeBSD 4.0 2000-03-13 [FBD]
428 NetBSD 1.4.2 2000-03-19 [NBD] (patch release)
429 OpenBSD 2.7 2000-06-15 [OBD]
430 FreeBSD 3.5 2000-06-24 [FBD]
431 FreeBSD 4.1 2000-07-27 [FBD]
432 FreeBSD 3.5.1 2000-07-28 [FBD]
433 FreeBSD 4.1.1 2000-09-25 [FBD] (a network-only patch release)
434 FreeBSD 4.2 2000-11-21 [FBD]
435 NetBSD 1.4.3 2000-11-25 [NBD] (patch release)
436 BSD/OS 4.2 2000-11-29 [BSDI]
437 OpenBSD 2.8 2000-12-01 [OBD]
438 NetBSD 1.5 2000-12-06 [NBD]
439 Mac OS X 10.0 2001-03-24 [APL]
440 FreeBSD 4.3 2001-04-20 [FBD]
441 OpenBSD 2.9 2001-06-01 [OBD]
442 NetBSD 1.5.1 2001-07-11 [NBD] (patch release)
443 NetBSD 1.5.2 2001-09-13 [NBD] (patch release)
444 FreeBSD 4.4 2001-09-18 [FBD]
445 Mac OS X 10.1 2001-09-29 [APL]
446 OpenBSD 3.0 2001-12-01 [OBD]
447 FreeBSD 4.5 2002-01-29 [FBD]
448 BSD/OS 4.3 2002-03-14 [WRS]
449 OpenBSD 3.1 2002-05-19 [OBD]
450 FreeBSD 4.6 2002-06-15 [FBD]
451 NetBSD 1.5.3 2002-07-22 [NBD] (patch release)
452 FreeBSD 4.6.2 2002-08-15 [FBD] (patch release)
453 Mac OS X 10.2 2002-08-23 [APL]
454 NetBSD 1.6 2002-09-14 [NBD]
455 FreeBSD 4.7 2002-10-08 [FBD]
456 OpenBSD 3.2 2002-11-01 [OBD]
457 FreeBSD 5.0 2003-01-17 [FBD]
458 FreeBSD 5.0 is a separate branch off of
459 -current, similar to 3.0.
460 FreeBSD 4.8 2003-04-03 [FBD]
461 NetBSD 1.6.1 2003-04-21 [NBD] (patch release)
462 OpenBSD 3.3 2003-05-01 [OBD]
463 BSD/OS 5.0 2003-05-?? [WRS]
464 FreeBSD 5.1 2003-06-09 [FBD]
465 Mac OS X 10.3 2003-10-24 [APL]
466 FreeBSD 4.9 2003-10-28 [FBD]
467 BSD/OS 5.1 ISE 2003-10-?? [WRS] (final version)
468 OpenBSD 3.4 2003-11-01 [OBD]
469 FreeBSD 5.2 2004-01-12 [FBD]
470 FreeBSD 5.2.1 2004-02-22 [FBD] (patch release)
471 NetBSD 1.6.2 2004-03-01 [NBD] (patch release)
472 OpenBSD 3.5 2004-04-01 [OBD]
473 FreeBSD 4.10 2004-05-27 [FBD]
474 DragonFly 1.0 2004-07-12 [DFB]
475 OpenBSD 3.6 2004-10-29 [OBD]
476 FreeBSD 5.3 2004-11-06 [FBD]
477 NetBSD 2.0 2004-12-09 [NBD]
478 FreeBSD 4.11 2005-01-25 [FBD]
479 DragonFly 1.2.0 2005-04-08 [DFB]
480 NetBSD 2.0.2 2005-04-14 [NBD] (security/critical release)
481 Mac OS X 10.4 2005-04-29 [APL]
482 FreeBSD 5.4 2005-05-09 [FBD]
483 OpenBSD 3.7 2005-05-19 [OBD]
484 NetBSD 2.0.3 2005-10-31 [NBD] (security/critical release)
485 OpenBSD 3.8 2005-11-01 [OBD]
486 FreeBSD 6.0 2005-11-01 [FBD]
487 NetBSD 2.1 2005-11-02 [NBD]
488 NetBSD 3.0 2005-12-23 [NBD]
489 DragonFly 1.4.0 2006-01-08 [DFB]
490 OpenBSD 3.9 2006-05-01 [OBD]
491 FreeBSD 6.1 2006-05-08 [FBD]
492 FreeBSD 5.5 2006-05-25 [FBD]
493 NetBSD 3.0.1 2006-07-24 [NBD] (security/critical release)
494 DragonFly 1.6.0 2006-07-24 [DFB]
495 OpenBSD 4.0 2006-11-01 [OBD]
496 NetBSD 3.0.2 2006-11-04 [NBD] (security/critical release)
497 NetBSD 3.1 2006-11-04 [NBD]
498 FreeBSD 6.2 2007-01-15 [FBD]
499 DragonFly 1.8.0 2007-01-30 [DFB]
500 OpenBSD 4.1 2007-05-01 [OBD]
501 DragonFly 1.10.0 2007-08-06 [DFB]
502 Mac OS X 10.5 2007-10-26 [APL]
503 OpenBSD 4.2 2007-11-01 [OBD]
504 NetBSD 4.0 2007-12-19 [NBD]
505 FreeBSD 6.3 2008-01-18 [FBD]
506 DragonFly 1.12.0 2008-02-26 [DFB]
507 FreeBSD 7.0 2008-02-27 [FBD]
508 OpenBSD 4.3 2008-05-01 [OBD]
509 DragonFly 2.0.0 2008-07-21 [DFB]
510 OpenBSD 4.4 2008-11-01 [OBD]
511 FreeBSD 6.4 2008-11-28 [FBD]
512 FreeBSD 7.1 2009-01-04 [FBD]
513 DragonFly 2.2.0 2009-02-17 [DFB]
514 NetBSD 5.0 2009-04-29 [NBD]
515 OpenBSD 4.5 2009-05-01 [OBD]
516 FreeBSD 7.2 2009-05-04 [FBD]
517 DragonFly 2.4.0 2009-09-16 [DFB]
518 OpenBSD 4.6 2009-10-18 [OBD]
519 FreeBSD 8.0 2009-11-26 [FBD]
520 FreeBSD 7.3 2010-03-23 [FBD]
521 DragonFly 2.6.0 2010-03-28 [DFB]
522 OpenBSD 4.7 2010-05-19 [OBD]
523 FreeBSD 8.1 2010-07-24 [FBD]
524 DragonFly 2.8.0 2010-10-30 [DFB]
525 OpenBSD 4.8 2010-11-01 [OBD]
528 ------------------------
530 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
531 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
532 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
534 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
535 Company, Inc., 1994. ISBN 0-201-54777-5
537 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
538 Quarterman. The Design and Implementation of the 4.4BSD Operating
539 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
541 McKusick, Marshall Kirk, George Neville-Neil. The Design and
542 Implementation of the FreeBSD Operating System.
543 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
545 Doug McIlroy. Research Unix Reader.
547 Michael G. Brown. The Role of BSD in the Development of Unix.
548 Presented to the Tasmanian Unix Special Interest Group of the
549 Australian Computer Society, Hobart, August 1993.
551 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
552 URL: http://www.byte.com/art/9410/sec8/art3.htm
554 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
555 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
557 BSD Release Announcements collection.
558 URL: http://www.FreeBSD.org/releases/
560 BSD Hypertext Man Pages
561 URL: http://www.FreeBSD.org/cgi/man.cgi
563 UNIX history graphing project
564 URL: http://minnie.tuhs.org/Unix_History/index.html
567 URL: http://www.levenez.com/unix/
569 James Howard: The BSD Family Tree
570 URL: http://ezine.daemonnews.org/200104/bsd_family.html
571 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
577 Josh Gilliam for suggestions, bug fixes, and finding very old
578 original BSD announcements from Usenet or tapes.
580 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
583 Copyright (c) 1997-2007 Wolfram Schneider <wosch@FreeBSD.ORG>
584 URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree