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
264 | | | OpenBSD 5.3 DragonFly 3.4.1
268 FreeBSD 10 -current | NetBSD -current OpenBSD -current |
275 Time tolerance +/- 6 months, depending on which book/article you read; if it
276 was the announcement in Usenet or if it was available as tape.
278 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
279 and John Quarterman. The Design and Implementation of
280 the 4.4BSD Operating System.
281 [APL] Apple website [http://www.apple.com/macosx/]
282 [BSDI] Berkeley Software Design, Inc.
283 [DFB] DragonFlyBSD Project, The.
284 [DOC] README, COPYRIGHT on tape.
285 [FBD] FreeBSD Project, The.
286 [KB] Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
287 Volume 11, Info 4, April, 1987.
288 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
289 comp.bugs.4bsd.ucb-fixes, June 15, 1988.
290 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
291 Changes in the Kernel in 2.9BSD. Second Berkeley Software
292 Distribution UNIX Version 2.9, July, 1983.
293 [NBD] NetBSD Project, The.
294 [OBD] OpenBSD Project, The.
295 [QCU] Salus, Peter H. A quarter century of UNIX.
296 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
297 [TUHS] The Unix Historical Society. http://minnie.tuhs.org/Unix_History/.
298 [USE] Usenet announcement.
299 [WRS] Wind River Systems, Inc.
300 [dmr] Dennis Ritchie, via E-Mail
305 First Edition 1971-11-03 [QCU]
306 DEC PDP-11/20, Assembler
307 Second Edition 1972-06-12 [QCU]
308 10 UNIX installations
309 Third Edition 1973-02-xx [QCU]
310 Pipes, 16 installations
311 Fourth Edition 1973-11-xx [QCU]
312 rewriting in C effected,
313 above 30 installations
314 Fifth Edition 1974-06-xx [QCU]
315 above 50 installations
316 Sixth Edition 1975-05-xx [QCU]
318 Seventh Edition 1979-01-xx [QCU]
320 Eighth Edition 1985-02-xx [QCU]
321 VAX 11/750, VAX 11/780 [dmr]
322 descended from 4.1c BSD [dmr]
323 descended from 4.1 BSD [44B]
324 scooping-out and replacement of the character-device
325 and networking part by the streams mechanism
327 Ninth Edition 1986-09-xx [QCU]
328 Tenth Edition 1989-10-xx [QCU]
332 PDP-11, Pascal, ex(1)
333 30 free copies of 1BSD sent out
334 35 tapes sold for 50 USD [QCU]
335 2BSD mid 1978 [QCU] 1979-05-10 [TUHS]
336 75 2BSD tapes shipped
337 2.79BSD 1980-04-xx [TUHS]
338 2.8BSD 1981-07-xx [KSJ]
340 2.8.1BSD 1982-01-xx [QCU]
341 set of performance improvements
342 2.9BSD 1983-07-xx [KSJ]
343 2.9.1BSD 1983-11-xx [TUHS]
344 2.9BSD-Seismo 1985-08-xx [SMS]
345 2.10BSD 1987-04-xx [KKK]
346 2.10.1BSD 1989-01-xx [SMS]
347 2.11BSD 1992-02-xx [SMS]
348 2.11BSD rev #430 1999-12-13 [SMS]
350 32V 1978-1[01]-xx [QCU]
351 3BSD late 1979 [QCU] March 1980 [TUHS]
352 virtual memory, page replacement,
355 4.1BSD 1981-07-08 [DOC]
357 alpha release, 100 sites, networking [44B]
358 4.1bBSD internal release, fast filesystem [44B]
360 beta release, IPC [44B]
361 4.2BSD 1983-09-xx [QCU]
363 4.3BSD 1986-06-xx [QCU]
364 1986-04-05 [KB], [DOC]
365 4.3BSD Tahoe 1988-06-15 [QCU], [DOC]
366 4.3BSD NET/1 1988-11-xx [QCU]
368 4.3BSD Reno 1990-06-29 [QCU], [DOC]
369 4.3BSD NET/2 1991-06-28 [QCU], [DOC]
371 BSD/386 ALPHA 1991-12-xx [BSDI]
372 first code released to people outside BSDI
373 386BSD 0.0 1992-02-xx [DOC]
374 BSD/386 0.3.1 1992-04-xx [BSDI] first ext. beta; B customers
375 BSD/386 0.3.3 1992-06-xx [BSDI] first CDROM version
376 386BSD 0.1 1992-07-28 [DOC]
377 4.4BSD Alpha 1992-07-07
378 BSD/386 0.9.3 1992-10-xx [BSDI]
379 first external gamma; G customers
380 BSD/386 0.9.4 1992-12-xx [BSDI]
381 would have been 1.0 except for request
382 for preliminary injunction
383 BSD/386 1.0 1993-03-xx [BSDI]
384 injunction denied; first official release
385 NetBSD 0.8 1993-04-20 [NBD]
386 4.4BSD 1993-06-01 [USE]
387 NetBSD 0.9 1993-08-23 [NBD]
388 FreeBSD 1.0 1993-11-01 [FBD]
389 FreeBSD 1.0.2 1993-11-14 [FBD]
390 supersedes 1.0 13 days after release.
391 BSD/386 1.1 1994-02-xx [BSDI]
392 4.4BSD Lite 1994-03-01 [USE]
393 FreeBSD 1.1 1994-05-07 [FBD]
394 FreeBSD 1.1.5 1994-06-30 [FBD]
395 FreeBSD 1.1.5.1 1994-07-05 [FBD]
396 supersedes 1.1.5 5 days after release.
397 NetBSD 1.0 1994-10-26 [NBD]
398 386BSD 1.0 1994-11-12 [USE]
399 FreeBSD 2.0 1994-11-23 [FBD]
400 BSD/OS 2.0 1995-01-xx [BSDI] 4.4 lite based
401 FreeBSD 2.0.5 1995-06-10 [FBD]
402 BSD/OS 2.0.1 1995-06-xx [BSDI]
403 4.4BSD Lite Release 2 1995-06-xx [44B]
404 the true final distribution from the CSRG
405 FreeBSD 2.1.0 1995-11-19 [FBD]
406 NetBSD 1.1 1995-11-26 [NBD]
407 BSD/OS 2.1 1996-01-xx [BSDI]
408 FreeBSD 2.1.5 1996-07-14 [FBD]
409 NetBSD 1.2 1996-10-04 [NBD]
410 OpenBSD 2.0 1996-10-18 [OBD]
411 FreeBSD 2.1.6 1996-11-16 [FBD]
412 FreeBSD 2.1.6.1 1996-11-25 [FBD] (sendmail security release)
414 FreeBSD 2.1.7 1997-02-20 [FBD]
415 BSD/OS 3.0 1997-02-xx [BSDI] 4.4 lite2 based
416 FreeBSD 2.2.0 1997-03-16 [FBD]
417 FreeBSD 2.2.1 1997-03-25 [FBD]
418 FreeBSD 2.2.2 1997-05-16 [FBD]
419 NetBSD 1.2.1 1997-05-20 [NBD] (patch release)
420 OpenBSD 2.1 1997-06-01 [OBD]
421 FreeBSD 2.2.5 1997-10-22 [FBD]
422 OpenBSD 2.2 1997-12-01 [OBD]
423 NetBSD 1.3 1998-01-04 [NBD]
424 FreeBSD 2.2.6 1998-03-25 [FBD]
425 NetBSD 1.3.1 1998-03-09 [NBD] (patch release)
426 BSD/OS 3.1 1998-03-xx [BSDI]
427 OpenBSD 2.3 1998-05-19 [OBD]
428 NetBSD 1.3.2 1998-05-29 [NBD] (patch release)
429 FreeBSD 2.2.7 1998-07-22 [FBD]
430 BSD/OS 4.0 1998-08-xx [BSDI]
431 2-lock MP support, ELF executables
432 FreeBSD 3.0 1998-10-16 [FBD]
433 FreeBSD-3.0 is a snapshot from -current,
434 while 3.1 and 3.2 are from 3.x-stable which
435 was branched quite some time after 3.0-release
436 FreeBSD 2.2.8 1998-11-29 [FBD]
437 OpenBSD 2.4 1998-12-01 [OBD]
438 NetBSD 1.3.3 1998-12-23 [NBD] (patch release)
439 FreeBSD 3.1 1999-02-15 [FBD]
440 BSD/OS 4.0.1 1999-03-xx [BSDI]
441 NetBSD 1.4 1999-05-12 [NBD]
442 FreeBSD 3.2 1999-05-17 [FBD]
443 OpenBSD 2.5 1999-05-19 [OBD]
444 NetBSD 1.4.1 1999-08-26 [NBD] (patch release)
445 FreeBSD 3.3 1999-09-17 [FBD]
446 OpenBSD 2.6 1999-12-01 [OBD]
447 FreeBSD 3.4 1999-12-20 [FBD]
448 BSD/OS 4.1 1999-12-xx [BSDI]
449 FreeBSD 4.0 2000-03-13 [FBD]
450 NetBSD 1.4.2 2000-03-19 [NBD] (patch release)
451 OpenBSD 2.7 2000-06-15 [OBD]
452 FreeBSD 3.5 2000-06-24 [FBD]
453 FreeBSD 4.1 2000-07-27 [FBD]
454 FreeBSD 3.5.1 2000-07-28 [FBD]
455 FreeBSD 4.1.1 2000-09-25 [FBD] (a network-only patch release)
456 FreeBSD 4.2 2000-11-21 [FBD]
457 NetBSD 1.4.3 2000-11-25 [NBD] (patch release)
458 BSD/OS 4.2 2000-11-29 [BSDI]
459 OpenBSD 2.8 2000-12-01 [OBD]
460 NetBSD 1.5 2000-12-06 [NBD]
461 Mac OS X 10.0 2001-03-24 [APL]
462 FreeBSD 4.3 2001-04-20 [FBD]
463 OpenBSD 2.9 2001-06-01 [OBD]
464 NetBSD 1.5.1 2001-07-11 [NBD] (patch release)
465 NetBSD 1.5.2 2001-09-13 [NBD] (patch release)
466 FreeBSD 4.4 2001-09-18 [FBD]
467 Mac OS X 10.1 2001-09-29 [APL]
468 OpenBSD 3.0 2001-12-01 [OBD]
469 FreeBSD 4.5 2002-01-29 [FBD]
470 BSD/OS 4.3 2002-03-14 [WRS]
471 OpenBSD 3.1 2002-05-19 [OBD]
472 FreeBSD 4.6 2002-06-15 [FBD]
473 NetBSD 1.5.3 2002-07-22 [NBD] (patch release)
474 FreeBSD 4.6.2 2002-08-15 [FBD] (patch release)
475 Mac OS X 10.2 2002-08-23 [APL]
476 NetBSD 1.6 2002-09-14 [NBD]
477 FreeBSD 4.7 2002-10-08 [FBD]
478 OpenBSD 3.2 2002-11-01 [OBD]
479 FreeBSD 5.0 2003-01-17 [FBD]
480 FreeBSD 5.0 is a separate branch off of
481 -current, similar to 3.0.
482 FreeBSD 4.8 2003-04-03 [FBD]
483 NetBSD 1.6.1 2003-04-21 [NBD] (patch release)
484 OpenBSD 3.3 2003-05-01 [OBD]
485 BSD/OS 5.0 2003-05-?? [WRS]
486 FreeBSD 5.1 2003-06-09 [FBD]
487 Mac OS X 10.3 2003-10-24 [APL]
488 FreeBSD 4.9 2003-10-28 [FBD]
489 BSD/OS 5.1 ISE 2003-10-?? [WRS] (final version)
490 OpenBSD 3.4 2003-11-01 [OBD]
491 FreeBSD 5.2 2004-01-12 [FBD]
492 FreeBSD 5.2.1 2004-02-22 [FBD] (patch release)
493 NetBSD 1.6.2 2004-03-01 [NBD] (patch release)
494 OpenBSD 3.5 2004-04-01 [OBD]
495 FreeBSD 4.10 2004-05-27 [FBD]
496 DragonFly 1.0 2004-07-12 [DFB]
497 OpenBSD 3.6 2004-10-29 [OBD]
498 FreeBSD 5.3 2004-11-06 [FBD]
499 NetBSD 2.0 2004-12-09 [NBD]
500 FreeBSD 4.11 2005-01-25 [FBD]
501 DragonFly 1.2.0 2005-04-08 [DFB]
502 NetBSD 2.0.2 2005-04-14 [NBD] (security/critical release)
503 Mac OS X 10.4 2005-04-29 [APL]
504 FreeBSD 5.4 2005-05-09 [FBD]
505 OpenBSD 3.7 2005-05-19 [OBD]
506 NetBSD 2.0.3 2005-10-31 [NBD] (security/critical release)
507 OpenBSD 3.8 2005-11-01 [OBD]
508 FreeBSD 6.0 2005-11-01 [FBD]
509 NetBSD 2.1 2005-11-02 [NBD]
510 NetBSD 3.0 2005-12-23 [NBD]
511 DragonFly 1.4.0 2006-01-08 [DFB]
512 OpenBSD 3.9 2006-05-01 [OBD]
513 FreeBSD 6.1 2006-05-08 [FBD]
514 FreeBSD 5.5 2006-05-25 [FBD]
515 NetBSD 3.0.1 2006-07-24 [NBD] (security/critical release)
516 DragonFly 1.6.0 2006-07-24 [DFB]
517 OpenBSD 4.0 2006-11-01 [OBD]
518 NetBSD 3.0.2 2006-11-04 [NBD] (security/critical release)
519 NetBSD 3.1 2006-11-04 [NBD]
520 FreeBSD 6.2 2007-01-15 [FBD]
521 DragonFly 1.8.0 2007-01-30 [DFB]
522 OpenBSD 4.1 2007-05-01 [OBD]
523 DragonFly 1.10.0 2007-08-06 [DFB]
524 Mac OS X 10.5 2007-10-26 [APL]
525 OpenBSD 4.2 2007-11-01 [OBD]
526 NetBSD 4.0 2007-12-19 [NBD]
527 FreeBSD 6.3 2008-01-18 [FBD]
528 DragonFly 1.12.0 2008-02-26 [DFB]
529 FreeBSD 7.0 2008-02-27 [FBD]
530 OpenBSD 4.3 2008-05-01 [OBD]
531 DragonFly 2.0.0 2008-07-21 [DFB]
532 OpenBSD 4.4 2008-11-01 [OBD]
533 FreeBSD 6.4 2008-11-28 [FBD]
534 FreeBSD 7.1 2009-01-04 [FBD]
535 DragonFly 2.2.0 2009-02-17 [DFB]
536 NetBSD 5.0 2009-04-29 [NBD]
537 OpenBSD 4.5 2009-05-01 [OBD]
538 FreeBSD 7.2 2009-05-04 [FBD]
539 Mac OS X 10.6 2009-06-08 [APL]
540 DragonFly 2.4.0 2009-09-16 [DFB]
541 OpenBSD 4.6 2009-10-18 [OBD]
542 FreeBSD 8.0 2009-11-26 [FBD]
543 FreeBSD 7.3 2010-03-23 [FBD]
544 DragonFly 2.6.0 2010-03-28 [DFB]
545 OpenBSD 4.7 2010-05-19 [OBD]
546 FreeBSD 8.1 2010-07-24 [FBD]
547 DragonFly 2.8.2 2010-10-30 [DFB]
548 OpenBSD 4.8 2010-11-01 [OBD]
549 NetBSD 5.1 2010-11-19 [NBD]
550 FreeBSD 7.4 2011-02-24 [FBD]
551 FreeBSD 8.2 2011-02-24 [FBD]
552 DragonFly 2.10.1 2011-04-26 [DFB]
553 OpenBSD 4.9 2011-05-01 [OBD]
554 Mac OS X 10.7 2011-07-20 [APL]
555 OpenBSD 5.0 2011-11-01 [OBD]
556 FreeBSD 9.0 2012-01-12 [FBD]
557 DragonFly 3.0.1 2012-02-21 [DFB]
558 FreeBSD 8.3 2012-04-18 [FBD]
559 OpenBSD 5.1 2012-05-01 [OBD]
560 Mac OS X 10.8 2012-07-25 [APL]
561 NetBSD 6.0 2012-10-17 [NBD]
562 OpenBSD 5.2 2012-11-01 [OBD]
563 DragonFly 3.2.1 2012-11-02 [DFB]
564 FreeBSD 9.1 2012-12-30 [FBD]
565 DragonFly 3.4.1 2013-04-29 [DFB]
566 OpenBSD 5.3 2013-05-01 [OBD]
569 ------------------------
571 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
572 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
573 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
575 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
576 Company, Inc., 1994. ISBN 0-201-54777-5
578 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
579 Quarterman. The Design and Implementation of the 4.4BSD Operating
580 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
582 McKusick, Marshall Kirk, George Neville-Neil. The Design and
583 Implementation of the FreeBSD Operating System.
584 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
586 Doug McIlroy. Research Unix Reader.
588 Michael G. Brown. The Role of BSD in the Development of Unix.
589 Presented to the Tasmanian Unix Special Interest Group of the
590 Australian Computer Society, Hobart, August 1993.
592 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
593 URL: http://www.byte.com/art/9410/sec8/art3.htm
595 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
596 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
598 BSD Release Announcements collection.
599 URL: http://www.FreeBSD.org/releases/
601 BSD Hypertext Man Pages
602 URL: http://www.FreeBSD.org/cgi/man.cgi
604 UNIX history graphing project
605 URL: http://minnie.tuhs.org/Unix_History/index.html
608 URL: http://www.levenez.com/unix/
610 James Howard: The BSD Family Tree
611 URL: http://ezine.daemonnews.org/200104/bsd_family.html
612 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
618 Josh Gilliam for suggestions, bug fixes, and finding very old
619 original BSD announcements from Usenet or tapes.
621 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
624 Copyright (c) 1997-2012 Wolfram Schneider <wosch@FreeBSD.ORG>
625 URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree