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 |
234 | | | | | | DragonFly 2.4.0
235 | | | | | OpenBSD 4.6 |
237 *--FreeBSD | | | | | |
239 | | FreeBSD | | | | |
240 | | 7.3 | | | | DragonFly 2.6.0
241 | | | | | | OpenBSD 4.7 |
242 | FreeBSD | | | | | |
244 | | | | | | | DragonFly 2.8.2
245 | | | | | | OpenBSD 4.8 |
246 | | | | | NetBSD 5.1 | |
247 | FreeBSD FreeBSD | | | |
248 | 8.2 7.4 | | | DragonFly 2.10.1
249 | | | | OpenBSD 4.9 |
250 | `-----. Mac OS X | | |
252 | | | | OpenBSD 5.0 |
254 | 9.0 | | | | DragonFly 3.0.1
256 | 8.3 | | OpenBSD 5.1 |
260 | | | OpenBSD 5.2 DragonFly 3.2.1
262 FreeBSD 10 -current | NetBSD -current OpenBSD -current |
269 Time tolerance +/- 6 months, depending on which book/article you read; if it
270 was the announcement in Usenet or if it was available as tape.
272 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
273 and John Quarterman. The Design and Implementation of
274 the 4.4BSD Operating System.
275 [APL] Apple website [http://www.apple.com/macosx/]
276 [BSDI] Berkeley Software Design, Inc.
277 [DFB] DragonFlyBSD Project, The.
278 [DOC] README, COPYRIGHT on tape.
279 [FBD] FreeBSD Project, The.
280 [KB] Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
281 Volume 11, Info 4, April, 1987.
282 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
283 comp.bugs.4bsd.ucb-fixes, June 15, 1988.
284 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
285 Changes in the Kernel in 2.9BSD. Second Berkeley Software
286 Distribution UNIX Version 2.9, July, 1983.
287 [NBD] NetBSD Project, The.
288 [OBD] OpenBSD Project, The.
289 [QCU] Salus, Peter H. A quarter century of UNIX.
290 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
291 [TUHS] The Unix Historical Society. http://minnie.tuhs.org/Unix_History/.
292 [USE] Usenet announcement.
293 [WRS] Wind River Systems, Inc.
294 [dmr] Dennis Ritchie, via E-Mail
299 First Edition 1971-11-03 [QCU]
300 DEC PDP-11/20, Assembler
301 Second Edition 1972-06-12 [QCU]
302 10 UNIX installations
303 Third Edition 1973-02-xx [QCU]
304 Pipes, 16 installations
305 Fourth Edition 1973-11-xx [QCU]
306 rewriting in C effected,
307 above 30 installations
308 Fifth Edition 1974-06-xx [QCU]
309 above 50 installations
310 Sixth Edition 1975-05-xx [QCU]
312 Seventh Edition 1979-01-xx [QCU]
314 Eighth Edition 1985-02-xx [QCU]
315 VAX 11/750, VAX 11/780 [dmr]
316 descended from 4.1c BSD [dmr]
317 descended from 4.1 BSD [44B]
318 scooping-out and replacement of the character-device
319 and networking part by the streams mechanism
321 Ninth Edition 1986-09-xx [QCU]
322 Tenth Edition 1989-10-xx [QCU]
326 PDP-11, Pascal, ex(1)
327 30 free copies of 1BSD sent out
328 35 tapes sold for 50 USD [QCU]
329 2BSD mid 1978 [QCU] 1979-05-10 [TUHS]
330 75 2BSD tapes shipped
331 2.79BSD 1980-04-xx [TUHS]
332 2.8BSD 1981-07-xx [KSJ]
334 2.8.1BSD 1982-01-xx [QCU]
335 set of performance improvements
336 2.9BSD 1983-07-xx [KSJ]
337 2.9.1BSD 1983-11-xx [TUHS]
338 2.9BSD-Seismo 1985-08-xx [SMS]
339 2.10BSD 1987-04-xx [KKK]
340 2.10.1BSD 1989-01-xx [SMS]
341 2.11BSD 1992-02-xx [SMS]
342 2.11BSD rev #430 1999-12-13 [SMS]
344 32V 1978-1[01]-xx [QCU]
345 3BSD late 1979 [QCU] March 1980 [TUHS]
346 virtual memory, page replacement,
349 4.1BSD 1981-07-08 [DOC]
351 alpha release, 100 sites, networking [44B]
352 4.1bBSD internal release, fast filesystem [44B]
354 beta release, IPC [44B]
355 4.2BSD 1983-09-xx [QCU]
357 4.3BSD 1986-06-xx [QCU]
358 1986-04-05 [KB], [DOC]
359 4.3BSD Tahoe 1988-06-15 [QCU], [DOC]
360 4.3BSD NET/1 1988-11-xx [QCU]
362 4.3BSD Reno 1990-06-29 [QCU], [DOC]
363 4.3BSD NET/2 1991-06-28 [QCU], [DOC]
365 BSD/386 ALPHA 1991-12-xx [BSDI]
366 first code released to people outside BSDI
367 386BSD 0.0 1992-02-xx [DOC]
368 BSD/386 0.3.1 1992-04-xx [BSDI] first ext. beta; B customers
369 BSD/386 0.3.3 1992-06-xx [BSDI] first CDROM version
370 386BSD 0.1 1992-07-28 [DOC]
371 4.4BSD Alpha 1992-07-07
372 BSD/386 0.9.3 1992-10-xx [BSDI]
373 first external gamma; G customers
374 BSD/386 0.9.4 1992-12-xx [BSDI]
375 would have been 1.0 except for request
376 for preliminary injunction
377 BSD/386 1.0 1993-03-xx [BSDI]
378 injunction denied; first official release
379 NetBSD 0.8 1993-04-20 [NBD]
380 4.4BSD 1993-06-01 [USE]
381 NetBSD 0.9 1993-08-23 [NBD]
382 FreeBSD 1.0 1993-11-01 [FBD]
383 FreeBSD 1.0.2 1993-11-14 [FBD]
384 supersedes 1.0 13 days after release.
385 BSD/386 1.1 1994-02-xx [BSDI]
386 4.4BSD Lite 1994-03-01 [USE]
387 FreeBSD 1.1 1994-05-07 [FBD]
388 FreeBSD 1.1.5 1994-06-30 [FBD]
389 FreeBSD 1.1.5.1 1994-07-05 [FBD]
390 supersedes 1.1.5 5 days after release.
391 NetBSD 1.0 1994-10-26 [NBD]
392 386BSD 1.0 1994-11-12 [USE]
393 FreeBSD 2.0 1994-11-23 [FBD]
394 BSD/OS 2.0 1995-01-xx [BSDI] 4.4 lite based
395 FreeBSD 2.0.5 1995-06-10 [FBD]
396 BSD/OS 2.0.1 1995-06-xx [BSDI]
397 4.4BSD Lite Release 2 1995-06-xx [44B]
398 the true final distribution from the CSRG
399 FreeBSD 2.1.0 1995-11-19 [FBD]
400 NetBSD 1.1 1995-11-26 [NBD]
401 BSD/OS 2.1 1996-01-xx [BSDI]
402 FreeBSD 2.1.5 1996-07-14 [FBD]
403 NetBSD 1.2 1996-10-04 [NBD]
404 OpenBSD 2.0 1996-10-18 [OBD]
405 FreeBSD 2.1.6 1996-11-16 [FBD]
406 FreeBSD 2.1.6.1 1996-11-25 [FBD] (sendmail security release)
408 FreeBSD 2.1.7 1997-02-20 [FBD]
409 BSD/OS 3.0 1997-02-xx [BSDI] 4.4 lite2 based
410 FreeBSD 2.2.0 1997-03-16 [FBD]
411 FreeBSD 2.2.1 1997-03-25 [FBD]
412 FreeBSD 2.2.2 1997-05-16 [FBD]
413 NetBSD 1.2.1 1997-05-20 [NBD] (patch release)
414 OpenBSD 2.1 1997-06-01 [OBD]
415 FreeBSD 2.2.5 1997-10-22 [FBD]
416 OpenBSD 2.2 1997-12-01 [OBD]
417 NetBSD 1.3 1998-01-04 [NBD]
418 FreeBSD 2.2.6 1998-03-25 [FBD]
419 NetBSD 1.3.1 1998-03-09 [NBD] (patch release)
420 BSD/OS 3.1 1998-03-xx [BSDI]
421 OpenBSD 2.3 1998-05-19 [OBD]
422 NetBSD 1.3.2 1998-05-29 [NBD] (patch release)
423 FreeBSD 2.2.7 1998-07-22 [FBD]
424 BSD/OS 4.0 1998-08-xx [BSDI]
425 2-lock MP support, ELF executables
426 FreeBSD 3.0 1998-10-16 [FBD]
427 FreeBSD-3.0 is a snapshot from -current,
428 while 3.1 and 3.2 are from 3.x-stable which
429 was branched quite some time after 3.0-release
430 FreeBSD 2.2.8 1998-11-29 [FBD]
431 OpenBSD 2.4 1998-12-01 [OBD]
432 NetBSD 1.3.3 1998-12-23 [NBD] (patch release)
433 FreeBSD 3.1 1999-02-15 [FBD]
434 BSD/OS 4.0.1 1999-03-xx [BSDI]
435 NetBSD 1.4 1999-05-12 [NBD]
436 FreeBSD 3.2 1999-05-17 [FBD]
437 OpenBSD 2.5 1999-05-19 [OBD]
438 NetBSD 1.4.1 1999-08-26 [NBD] (patch release)
439 FreeBSD 3.3 1999-09-17 [FBD]
440 OpenBSD 2.6 1999-12-01 [OBD]
441 FreeBSD 3.4 1999-12-20 [FBD]
442 BSD/OS 4.1 1999-12-xx [BSDI]
443 FreeBSD 4.0 2000-03-13 [FBD]
444 NetBSD 1.4.2 2000-03-19 [NBD] (patch release)
445 OpenBSD 2.7 2000-06-15 [OBD]
446 FreeBSD 3.5 2000-06-24 [FBD]
447 FreeBSD 4.1 2000-07-27 [FBD]
448 FreeBSD 3.5.1 2000-07-28 [FBD]
449 FreeBSD 4.1.1 2000-09-25 [FBD] (a network-only patch release)
450 FreeBSD 4.2 2000-11-21 [FBD]
451 NetBSD 1.4.3 2000-11-25 [NBD] (patch release)
452 BSD/OS 4.2 2000-11-29 [BSDI]
453 OpenBSD 2.8 2000-12-01 [OBD]
454 NetBSD 1.5 2000-12-06 [NBD]
455 Mac OS X 10.0 2001-03-24 [APL]
456 FreeBSD 4.3 2001-04-20 [FBD]
457 OpenBSD 2.9 2001-06-01 [OBD]
458 NetBSD 1.5.1 2001-07-11 [NBD] (patch release)
459 NetBSD 1.5.2 2001-09-13 [NBD] (patch release)
460 FreeBSD 4.4 2001-09-18 [FBD]
461 Mac OS X 10.1 2001-09-29 [APL]
462 OpenBSD 3.0 2001-12-01 [OBD]
463 FreeBSD 4.5 2002-01-29 [FBD]
464 BSD/OS 4.3 2002-03-14 [WRS]
465 OpenBSD 3.1 2002-05-19 [OBD]
466 FreeBSD 4.6 2002-06-15 [FBD]
467 NetBSD 1.5.3 2002-07-22 [NBD] (patch release)
468 FreeBSD 4.6.2 2002-08-15 [FBD] (patch release)
469 Mac OS X 10.2 2002-08-23 [APL]
470 NetBSD 1.6 2002-09-14 [NBD]
471 FreeBSD 4.7 2002-10-08 [FBD]
472 OpenBSD 3.2 2002-11-01 [OBD]
473 FreeBSD 5.0 2003-01-17 [FBD]
474 FreeBSD 5.0 is a separate branch off of
475 -current, similar to 3.0.
476 FreeBSD 4.8 2003-04-03 [FBD]
477 NetBSD 1.6.1 2003-04-21 [NBD] (patch release)
478 OpenBSD 3.3 2003-05-01 [OBD]
479 BSD/OS 5.0 2003-05-?? [WRS]
480 FreeBSD 5.1 2003-06-09 [FBD]
481 Mac OS X 10.3 2003-10-24 [APL]
482 FreeBSD 4.9 2003-10-28 [FBD]
483 BSD/OS 5.1 ISE 2003-10-?? [WRS] (final version)
484 OpenBSD 3.4 2003-11-01 [OBD]
485 FreeBSD 5.2 2004-01-12 [FBD]
486 FreeBSD 5.2.1 2004-02-22 [FBD] (patch release)
487 NetBSD 1.6.2 2004-03-01 [NBD] (patch release)
488 OpenBSD 3.5 2004-04-01 [OBD]
489 FreeBSD 4.10 2004-05-27 [FBD]
490 DragonFly 1.0 2004-07-12 [DFB]
491 OpenBSD 3.6 2004-10-29 [OBD]
492 FreeBSD 5.3 2004-11-06 [FBD]
493 NetBSD 2.0 2004-12-09 [NBD]
494 FreeBSD 4.11 2005-01-25 [FBD]
495 DragonFly 1.2.0 2005-04-08 [DFB]
496 NetBSD 2.0.2 2005-04-14 [NBD] (security/critical release)
497 Mac OS X 10.4 2005-04-29 [APL]
498 FreeBSD 5.4 2005-05-09 [FBD]
499 OpenBSD 3.7 2005-05-19 [OBD]
500 NetBSD 2.0.3 2005-10-31 [NBD] (security/critical release)
501 OpenBSD 3.8 2005-11-01 [OBD]
502 FreeBSD 6.0 2005-11-01 [FBD]
503 NetBSD 2.1 2005-11-02 [NBD]
504 NetBSD 3.0 2005-12-23 [NBD]
505 DragonFly 1.4.0 2006-01-08 [DFB]
506 OpenBSD 3.9 2006-05-01 [OBD]
507 FreeBSD 6.1 2006-05-08 [FBD]
508 FreeBSD 5.5 2006-05-25 [FBD]
509 NetBSD 3.0.1 2006-07-24 [NBD] (security/critical release)
510 DragonFly 1.6.0 2006-07-24 [DFB]
511 OpenBSD 4.0 2006-11-01 [OBD]
512 NetBSD 3.0.2 2006-11-04 [NBD] (security/critical release)
513 NetBSD 3.1 2006-11-04 [NBD]
514 FreeBSD 6.2 2007-01-15 [FBD]
515 DragonFly 1.8.0 2007-01-30 [DFB]
516 OpenBSD 4.1 2007-05-01 [OBD]
517 DragonFly 1.10.0 2007-08-06 [DFB]
518 Mac OS X 10.5 2007-10-26 [APL]
519 OpenBSD 4.2 2007-11-01 [OBD]
520 NetBSD 4.0 2007-12-19 [NBD]
521 FreeBSD 6.3 2008-01-18 [FBD]
522 DragonFly 1.12.0 2008-02-26 [DFB]
523 FreeBSD 7.0 2008-02-27 [FBD]
524 OpenBSD 4.3 2008-05-01 [OBD]
525 DragonFly 2.0.0 2008-07-21 [DFB]
526 OpenBSD 4.4 2008-11-01 [OBD]
527 FreeBSD 6.4 2008-11-28 [FBD]
528 FreeBSD 7.1 2009-01-04 [FBD]
529 DragonFly 2.2.0 2009-02-17 [DFB]
530 NetBSD 5.0 2009-04-29 [NBD]
531 OpenBSD 4.5 2009-05-01 [OBD]
532 FreeBSD 7.2 2009-05-04 [FBD]
533 Mac OS X 10.6 2009-06-08 [APL]
534 DragonFly 2.4.0 2009-09-16 [DFB]
535 OpenBSD 4.6 2009-10-18 [OBD]
536 FreeBSD 8.0 2009-11-26 [FBD]
537 FreeBSD 7.3 2010-03-23 [FBD]
538 DragonFly 2.6.0 2010-03-28 [DFB]
539 OpenBSD 4.7 2010-05-19 [OBD]
540 FreeBSD 8.1 2010-07-24 [FBD]
541 DragonFly 2.8.2 2010-10-30 [DFB]
542 OpenBSD 4.8 2010-11-01 [OBD]
543 NetBSD 5.1 2010-11-19 [NBD]
544 FreeBSD 7.4 2011-02-24 [FBD]
545 FreeBSD 8.2 2011-02-24 [FBD]
546 DragonFly 2.10.1 2011-04-26 [DFB]
547 OpenBSD 4.9 2011-05-01 [OBD]
548 Mac OS X 10.7 2011-07-20 [APL]
549 OpenBSD 5.0 2011-11-01 [OBD]
550 FreeBSD 9.0 2012-01-12 [FBD]
551 DragonFly 3.0.1 2012-02-21 [DFB]
552 FreeBSD 8.3 2012-04-18 [FBD]
553 OpenBSD 5.1 2012-05-01 [OBD]
554 Mac OS X 10.8 2012-07-25 [APL]
555 NetBSD 6.0 2012-10-17 [NBD]
556 OpenBSD 5.2 2012-11-01 [OBD]
557 DragonFly 3.2.1 2012-11-02 [DFB]
560 ------------------------
562 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
563 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
564 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
566 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
567 Company, Inc., 1994. ISBN 0-201-54777-5
569 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
570 Quarterman. The Design and Implementation of the 4.4BSD Operating
571 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
573 McKusick, Marshall Kirk, George Neville-Neil. The Design and
574 Implementation of the FreeBSD Operating System.
575 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
577 Doug McIlroy. Research Unix Reader.
579 Michael G. Brown. The Role of BSD in the Development of Unix.
580 Presented to the Tasmanian Unix Special Interest Group of the
581 Australian Computer Society, Hobart, August 1993.
583 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
584 URL: http://www.byte.com/art/9410/sec8/art3.htm
586 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
587 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
589 BSD Release Announcements collection.
590 URL: http://www.FreeBSD.org/releases/
592 BSD Hypertext Man Pages
593 URL: http://www.FreeBSD.org/cgi/man.cgi
595 UNIX history graphing project
596 URL: http://minnie.tuhs.org/Unix_History/index.html
599 URL: http://www.levenez.com/unix/
601 James Howard: The BSD Family Tree
602 URL: http://ezine.daemonnews.org/200104/bsd_family.html
603 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
609 Josh Gilliam for suggestions, bug fixes, and finding very old
610 original BSD announcements from Usenet or tapes.
612 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
615 Copyright (c) 1997-2012 Wolfram Schneider <wosch@FreeBSD.ORG>
616 URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree
618 $FreeBSD: src/share/misc/bsd-family-tree,v 1.159 2012/11/03 19:26:08 maxim Exp $