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  1. The UNIX system family tree: Research and BSD
  2. ---------------------------------------------
  3.  
  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.  |      |             |      |    v            |             |
  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    |    v            |             |
  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.  |      v             |      | NetBSD 1.6.2    |
  166.  |                    |      |    |            |
  167.  |                    |      |    v        OpenBSD 3.5
  168. FreeBSD 5.0          |      |                 |
  169.  |                    |      |                 |
  170. FreeBSD 5.1           |   NetBSD -current  OpenBSD -current
  171.  |          \         |      |                 |
  172.  |           ----- Mac OS X  |                 |
  173.  |                   10.3    |                 |
  174. FreeBSD 5.2           |      |                 |
  175.  |      |             |      |                 |
  176.  |   FreeBSD 5.2.1    |      |                 |
  177.  |                    |      |                 |
  178. FreeBSD 5 -current    |      |                 |
  179.  |                    |      |                 |
  180.  v                    v      v                 v
  181.  
  182. Time
  183. ----------------
  184.  
  185. Time tolerance +/- 6 months, depending on which book/article you read; if it
  186. was the announcement in Usenet or if it was available as tape.
  187.  
  188. [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
  189.     and John Quarterman. The Design and Implementation of
  190.     the 4.4BSD Operating System.
  191. [APL] Apple website [http://www.apple.com/macosx/]
  192. [BSDI] Berkeley Software Design, Inc.
  193. [DOC] README, COPYRIGHT on tape.
  194. [FBD] FreeBSD Project, The.
  195. [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
  196.     Volume 11, Info 4, April, 1987.
  197. [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
  198.     comp.bugs.4bsd.ucb-fixes, June 15, 1988.
  199. [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
  200.     Changes in the Kernel in 2.9BSD. Second Berkeley Software
  201.     Distribution UNIX Version 2.9, July, 1983.
  202. [NBD] NetBSD Project, The.
  203. [OBD] OpenBSD Project, The.
  204. [QCU] Salus, Peter H. A quarter century of UNIX.
  205. [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
  206. [USE] Usenet announcement.
  207. [WRS] Wind River Systems, Inc.
  208. [dmr] Dennis Ritchie, via E-Mail
  209.  
  210. Multics                 1965
  211. UNIX                    Summer 1969
  212.                 DEC PDP-7
  213. First   Edition         1971-11-03 [QCU]
  214.                 DEC PDP-11/20, Assembler
  215. Second  Edition         1972-06-12 [QCU]
  216.                 10 UNIX installations
  217. Third   Edition         1973-02-xx [QCU]
  218.                 Pipes, 16 installations
  219. Fourth  Edition         1973-11-xx [QCU]
  220.                 rewriting in C effected,
  221.                                 above 30 installations
  222. Fifth   Edition         1974-06-xx [QCU]
  223.                 above 50 installations
  224. Sixth   Edition         1975-05-xx [QCU]
  225.                 port to DEC Vax
  226. Seventh Edition         1979-01-xx [QCU]
  227.                 first portable UNIX
  228. Eighth  Edition         1985-02-xx [QCU]
  229.                 VAX 11/750, VAX 11/780 [dmr]
  230.                 descended from 4.1c BSD [dmr]
  231.                 descended from 4.1 BSD [44B]
  232.             scooping-out and replacement of the character-device
  233.             and networking part by the streams mechanism
  234.  
  235. Ninth   Edition         1986-09-xx [QCU]
  236. Tenth   Edition         1989-10-xx [QCU]
  237.  
  238. 1BSD                    late 1977
  239.             1978-03-09 [QCU]
  240.                 PDP-11, Pascal, ex(1)
  241.                 30 free copies of 1BSD sent out
  242.                 35 tapes sold for 50 USD [QCU]
  243. 2BSD                    mid 1978 [QCU]
  244.                 75 2BSD tapes shipped
  245. 2.7.9BSD        ?? [SMS]
  246. 2.8BSD            1981-07-xx [KSJ]
  247.  
  248. 2.8.1BSD        1982-01-xx [QCU]
  249.                 set of performance improvements
  250. 2.9BSD            1983-07-xx [KSJ]
  251. 2.9.1BSD                1983-11-xx
  252. 2.9BSD-Seismo        1985-08-xx [SMS]
  253. 2.10BSD            1987-04-xx [KKK]
  254. 2.10.1BSD        1989-01-xx [SMS]
  255. 2.11BSD            1992-02-xx [SMS]
  256. 2.11BSD rev #430    1999-12-13 [SMS]
  257.  
  258. 32V            1978-1[01]-xx [QCU]
  259. 3BSD                    late 1979 [QCU]
  260.                 virtual memory, page replacement,
  261.                             demand paging
  262. 4.0BSD                  1980-10-xx
  263. 4.1BSD                  1981-07-08 [DOC]
  264. 4.1aBSD                 1982-04-xx
  265.                 alpha release, 100 sites, networking [44B]
  266. 4.1bBSD                internal release, fast filesystem [44B]
  267. 4.1cBSD                 late 1982
  268.                 beta release, IPC [44B]
  269. 4.2BSD                  1983-09-xx [QCU]
  270.                         1983-08-03 [DOC]
  271. 4.3BSD                  1986-06-xx [QCU]
  272.             1986-04-05 [KB], [DOC]
  273. 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
  274. 4.3BSD NET/1            1988-11-xx [QCU]
  275.                         1989-01-01 [DOC]
  276. 4.3BSD Reno             1990-06-29 [QCU], [DOC]
  277. 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
  278.  
  279. BSD/386 ALPHA        1991-12-xx [BSDI]
  280.                 first code released to people outside BSDI
  281. 386BSD 0.0              1992-02-xx [DOC]
  282. BSD/386 0.3.1            1992-04-xx [BSDI] first ext. beta; B customers
  283. BSD/386 0.3.3        1992-06-xx [BSDI] first CDROM version
  284. 386BSD 0.1              1992-07-28 [DOC]
  285. 4.4BSD Alpha            1992-07-07
  286. BSD/386 0.9.3        1992-10-xx [BSDI]
  287.                 first external gamma; G customers
  288. BSD/386 0.9.4        1992-12-xx [BSDI]
  289.                 would have been 1.0 except for request
  290.                 for preliminary injunction
  291. BSD/386 1.0         1993-03-xx [BSDI]
  292.                 injunction denied; first official release
  293. NetBSD 0.8              1993-04-20 [NBD]
  294. 4.4BSD                  1993-06-01 [USE]
  295. NetBSD 0.9              1993-08-23 [NBD]
  296. FreeBSD 1.0        1993-11-01 [FBD]
  297. BSD/386 1.1        1994-02-xx [BSDI]
  298. 4.4BSD Lite             1994-03-01 [USE]
  299. FreeBSD 1.1        1994-04-xx [FBD]
  300. FreeBSD 1.1.5.1        1994-07-xx [FBD]
  301.                 supersedes 1.1.5 3 days after release.
  302. NetBSD 1.0              1994-10-26 [NBD]
  303. 386BSD 1.0              1994-11-12 [USE]
  304. FreeBSD 2.0        1995-01-xx [FBD]
  305. BSD/OS 2.0        1995-01-xx [BSDI] 4.4 lite based
  306. FreeBSD 2.0.5        1995-06-10 [FBD]
  307. BSD/OS 2.0.1        1995-06-xx [BSDI]
  308. 4.4BSD Lite Release 2    1995-06-xx [44B]
  309.                 the true final distribution from the CSRG
  310. FreeBSD 2.1.0        1995-11-19 [FBD]
  311. NetBSD 1.1              1995-11-26 [NBD]
  312. BSD/OS 2.1        1996-01-xx [BSDI]
  313. FreeBSD 2.1.5        1996-07-14 [FBD]
  314. NetBSD 1.2              1996-10-04 [NBD]
  315. OpenBSD 2.0             1996-10-18 [OBD]
  316. FreeBSD 2.1.6        1996-11-16 [FBD]
  317. FreeBSD 2.1.6.1        1996-11-25 [FBD] (sendmail security release)
  318. Rhapsody        1997-xx-xx
  319. FreeBSD 2.1.7        1997-02-20 [FBD]
  320. BSD/OS 3.0        1997-02-xx [BSDI] 4.4 lite2 based
  321. FreeBSD 2.2.0        1997-03-16 [FBD]
  322. FreeBSD 2.2.1        1997-03-25 [FBD]
  323. FreeBSD 2.2.2        1997-05-16 [FBD]
  324. NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
  325. OpenBSD 2.1             1997-06-01 [OBD]
  326. FreeBSD 2.2.5        1997-10-22 [FBD]
  327. OpenBSD 2.2             1997-12-01 [OBD]
  328. NetBSD 1.3              1998-01-04 [NBD]
  329. FreeBSD 2.2.6        1998-03-25 [FBD]
  330. NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
  331. BSD/OS 3.1        1998-03-xx [BSDI]
  332. OpenBSD 2.3             1998-05-19 [OBD]
  333. NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
  334. FreeBSD 2.2.7        1998-07-22 [FBD]
  335. BSD/OS 4.0        1998-08-xx [BSDI]
  336.                 2-lock MP support, ELF executables
  337. FreeBSD 3.0        1998-10-16 [FBD]
  338.                 FreeBSD-3.0 is a snapshot from -current,
  339.                 while 3.1 and 3.2 are from 3.x-stable which
  340.                 was branched quite some time after 3.0-release
  341. FreeBSD 2.2.8           1998-11-29 [FBD]
  342. OpenBSD 2.4             1998-12-01 [OBD]
  343. NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
  344. FreeBSD 3.1        1999-02-15 [FBD]
  345. BSD/OS 4.0.1        1999-03-xx [BSDI]
  346. NetBSD 1.4              1999-05-12 [NBD]
  347. FreeBSD 3.2             1999-05-17 [FBD]
  348. OpenBSD 2.5             1999-05-19 [OBD]
  349. NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
  350. FreeBSD 3.3             1999-09-17 [FBD]
  351. OpenBSD 2.6             1999-12-01 [OBD]
  352. FreeBSD 3.4             1999-12-20 [FBD]
  353. BSD/OS 4.1        1999-12-xx [BSDI]
  354. FreeBSD 4.0             2000-03-13 [FBD]
  355. NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
  356. OpenBSD 2.7             2000-06-15 [OBD]
  357. FreeBSD 3.5        2000-06-24 [FBD]
  358. FreeBSD 4.1        2000-07-27 [FBD]
  359. FreeBSD 3.5.1        2000-07-28 [FBD]
  360. FreeBSD 4.1.1        2000-09-25 [FBD] (a network-only patch release)
  361. FreeBSD 4.2          2000-11-21 [FBD]
  362. NetBSD 1.4.3        2000-11-25 [NBD] (patch release)
  363. BSD/OS 4.2        2000-11-29 [BSDI]
  364. OpenBSD 2.8        2000-12-01 [OBD]
  365. NetBSD 1.5              2000-12-06 [NBD]
  366. Mac OS X 10.0           2001-03-24 [APL]
  367. FreeBSD 4.3          2001-04-20 [FBD]
  368. OpenBSD 2.9          2001-06-01 [OBD]
  369. NetBSD 1.5.1        2001-07-11 [NBD] (patch release)
  370. NetBSD 1.5.2        2001-09-13 [NBD] (patch release)
  371. FreeBSD 4.4          2001-09-18 [FBD]
  372. Mac OS X 10.1        2001-09-29 [APL]
  373. OpenBSD 3.0        2001-12-01 [OBD]
  374. FreeBSD 4.5          2002-01-29 [FBD]
  375. BSD/OS 4.3        2002-03-14 [WRS]
  376. OpenBSD 3.1        2002-05-19 [OBD]
  377. FreeBSD 4.6          2002-06-15 [FBD]
  378. NetBSD 1.5.3        2002-07-22 [NBD] (patch release)
  379. FreeBSD 4.6.2        2002-08-15 [FBD] (patch release)
  380. Mac OS X 10.2        2002-08-23 [APL]
  381. NetBSD 1.6        2002-09-14 [NBD]
  382. FreeBSD 4.7        2002-10-08 [FBD]
  383. OpenBSD 3.2        2002-11-01 [OBD]
  384. FreeBSD 5.0        2003-01-17 [FBD]
  385.                 FreeBSD 5.0 is a separate branch off of
  386.                 -current, similar to 3.0.
  387. FreeBSD 4.8        2003-04-03 [FBD]
  388. NetBSD 1.6.1        2003-04-21 [NBD] (patch release)
  389. OpenBSD 3.3        2003-05-01 [OBD]
  390. BSD/OS 5.0        2003-05-?? [WRS]
  391. FreeBSD 5.1        2003-06-09 [FBD]
  392. Mac OS X 10.3        2003-10-24 [APL]
  393. FreeBSD 4.9        2003-10-28 [FBD]
  394. BSD/OS 5.1 ISE        2003-10-?? [WRS] (final version)
  395. OpenBSD 3.4        2003-11-01 [OBD]
  396. FreeBSD 5.2        2004-01-12 [FBD]
  397. FreeBSD 5.2.1        2004-02-22 [FBD] (patch release)
  398. NetBSD 1.6.2        2004-03-01 [NBD] (patch release)
  399. OpenBSD 3.5        2004-04-01 [OBD]
  400.  
  401. Bibliography
  402. ------------------------
  403.  
  404. Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
  405. Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
  406. System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
  407.  
  408. Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
  409. Company, Inc., 1994. ISBN 0-201-54777-5
  410.  
  411. McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
  412. Quarterman. The Design and Implementation of the 4.4BSD Operating
  413. System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
  414.  
  415. Doug McIlroy. Research Unix Reader.
  416.  
  417. Michael G. Brown. The Role of BSD in the Development of Unix.
  418. Presented to the Tasmanian Unix Special Interest Group of the
  419. Australian Computer Society, Hobart, August 1993.
  420.  
  421. Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
  422. URL: http://www.byte.com/art/9410/sec8/art3.htm (unreachable)
  423.  
  424. Andreas Klemm, Lars K÷ller. If you're going to San Francisco ...
  425. Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
  426.  
  427. BSD Release Announcements collection.
  428. URL: http://www.de.FreeBSD.org/de/ftp/releases/
  429.  
  430. BSD Hypertext Man Pages
  431. URL: http://www.FreeBSD.org/cgi/man.cgi
  432.  
  433. UNIX history graphing project
  434. URL: http://minnie.tuhs.org/Unix_History/index.html
  435.  
  436. UNIX history
  437. URL: http://www.levenez.com/unix/
  438.  
  439. James Howard: The BSD Family Tree
  440. URL: http://www.daemonnews.org/200104/bsd_family.html
  441. ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
  442.  
  443.  
  444. Acknowledgments
  445. ---------------
  446.  
  447. Josh Gilliam for suggestions, bug fixes, and finding very old
  448. original BSD announcements from Usenet or tapes.
  449.  
  450. Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
  451.  
  452. --
  453. Copyright (c) 1997-2004 Wolfram Schneider <wosch@FreeBSD.ORG>
  454. URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree
  455.  
  456. $FreeBSD: src/share/misc/bsd-family-tree,v 1.21.2.18 2004/05/06 16:08:17 maxim Exp $
  457.