share/misc/bsd-family-tree

   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  |      |          |  |      | NetBSD 1.6.2    |
 166  |      |          |  |      |    |            |
 167  |      |          |  |      |    |        OpenBSD 3.5
 168  |      |          |  |      |    v            |
 169  |   FreeBSD 4.10  |  |      |                 |
 170  |      |          |  |      |                 |
 171  |      v           `-|------|-----------------|---------------------.
 172  |                    |      |                 |                      \
 173 FreeBSD 5.0           |      |                 |                       |
 174  |                    |      |                 |                       |
 175 FreeBSD 5.1           |   NetBSD -current  OpenBSD -current        DragonFly 1.0
 176  |          \         |      |                 |                       |
 177  |           ----- Mac OS X  |                 |                       |
 178  |                   10.3    |                 |                       |
 179 FreeBSD 5.2           |      |                 |                       |
 180  |      |             |      |                 |                       |
 181  |   FreeBSD 5.2.1    |      |                 |                       |
 182  |                    |      |                 |                       |
 183 FreeBSD 6 -current    |      |                 |                       |
 184  |                    |      |                 |                       |
 185  v                    v      v                 v                       v
 186
 187 Time
 188 ----------------
 189
 190 Time tolerance +/- 6 months, depending on which book/article you read; if it
 191 was the announcement in Usenet or if it was available as tape.
 192
 193 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
 194         and John Quarterman. The Design and Implementation of
 195         the 4.4BSD Operating System.
 196 [APL] Apple website [http://www.apple.com/macosx/]
 197 [BSDI] Berkeley Software Design, Inc.
 198 [DFB] DragonFly BSD Project, The.
 199 [DOC] README, COPYRIGHT on tape.
 200 [FBD] FreeBSD Project, The.
 201 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
 202         Volume 11, Info 4, April, 1987.
 203 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
 204         comp.bugs.4bsd.ucb-fixes, June 15, 1988.
 205 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
 206         Changes in the Kernel in 2.9BSD. Second Berkeley Software
 207         Distribution UNIX Version 2.9, July, 1983.
 208 [NBD] NetBSD Project, The.
 209 [OBD] OpenBSD Project, The.
 210 [QCU] Salus, Peter H. A quarter century of UNIX.
 211 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
 212 [USE] Usenet announcement.
 213 [WRS] Wind River Systems, Inc.
 214 [dmr] Dennis Ritchie, via E-Mail
 215
 216 Multics                 1965
 217 UNIX                    Summer 1969
 218                                 DEC PDP-7
 219 First   Edition         1971-11-03 [QCU]
 220                                 DEC PDP-11/20, Assembler
 221 Second  Edition         1972-06-12 [QCU]
 222                                 10 UNIX installations
 223 Third   Edition         1973-02-xx [QCU]
 224                                 Pipes, 16 installations
 225 Fourth  Edition         1973-11-xx [QCU]
 226                                 rewriting in C effected,
 227                                 above 30 installations
 228 Fifth   Edition         1974-06-xx [QCU]
 229                                 above 50 installations
 230 Sixth   Edition         1975-05-xx [QCU]
 231                                 port to DEC Vax
 232 Seventh Edition         1979-01-xx [QCU]
 233                                 first portable UNIX
 234 Eighth  Edition         1985-02-xx [QCU]
 235                                 VAX 11/750, VAX 11/780 [dmr]
 236                                 descended from 4.1c BSD [dmr]
 237                                 descended from 4.1 BSD [44B]
 238                         scooping-out and replacement of the character-device
 239                         and networking part by the streams mechanism
 240
 241 Ninth   Edition         1986-09-xx [QCU]
 242 Tenth   Edition         1989-10-xx [QCU]
 243
 244 1BSD                    late 1977
 245                         1978-03-09 [QCU]
 246                                 PDP-11, Pascal, ex(1)
 247                                 30 free copies of 1BSD sent out
 248                                 35 tapes sold for 50 USD [QCU]
 249 2BSD                    mid 1978 [QCU]
 250                                 75 2BSD tapes shipped
 251 2.7.9BSD                ?? [SMS]
 252 2.8BSD                  1981-07-xx [KSJ]
 253
 254 2.8.1BSD                1982-01-xx [QCU]
 255                                 set of performance improvements
 256 2.9BSD                  1983-07-xx [KSJ]
 257 2.9.1BSD                1983-11-xx
 258 2.9BSD-Seismo           1985-08-xx [SMS]
 259 2.10BSD                 1987-04-xx [KKK]
 260 2.10.1BSD               1989-01-xx [SMS]
 261 2.11BSD                 1992-02-xx [SMS]
 262 2.11BSD rev #430        1999-12-13 [SMS]
 263
 264 32V                     1978-1[01]-xx [QCU]
 265 3BSD                    late 1979 [QCU]
 266                                 virtual memory, page replacement,
 267                                 demand paging
 268 4.0BSD                  1980-10-xx
 269 4.1BSD                  1981-07-08 [DOC]
 270 4.1aBSD                 1982-04-xx
 271                                 alpha release, 100 sites, networking [44B]
 272 4.1bBSD                         internal release, fast filesystem [44B]
 273 4.1cBSD                 late 1982
 274                                 beta release, IPC [44B]
 275 4.2BSD                  1983-09-xx [QCU]
 276                         1983-08-03 [DOC]
 277 4.3BSD                  1986-06-xx [QCU]
 278                         1986-04-05 [KB], [DOC]
 279 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
 280 4.3BSD NET/1            1988-11-xx [QCU]
 281                         1989-01-01 [DOC]
 282 4.3BSD Reno             1990-06-29 [QCU], [DOC]
 283 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
 284
 285 BSD/386 ALPHA           1991-12-xx [BSDI]
 286                                 first code released to people outside BSDI
 287 386BSD 0.0              1992-02-xx [DOC]
 288 BSD/386 0.3.1           1992-04-xx [BSDI] first ext. beta; B customers
 289 BSD/386 0.3.3           1992-06-xx [BSDI] first CDROM version
 290 386BSD 0.1              1992-07-28 [DOC]
 291 4.4BSD Alpha            1992-07-07
 292 BSD/386 0.9.3           1992-10-xx [BSDI]
 293                                 first external gamma; G customers
 294 BSD/386 0.9.4           1992-12-xx [BSDI]
 295                                 would have been 1.0 except for request
 296                                 for preliminary injunction
 297 BSD/386 1.0             1993-03-xx [BSDI]
 298                                 injunction denied; first official release
 299 NetBSD 0.8              1993-04-20 [NBD]
 300 4.4BSD                  1993-06-01 [USE]
 301 NetBSD 0.9              1993-08-23 [NBD]
 302 FreeBSD 1.0             1993-11-01 [FBD]
 303 BSD/386 1.1             1994-02-xx [BSDI]
 304 4.4BSD Lite             1994-03-01 [USE]
 305 FreeBSD 1.1             1994-04-xx [FBD]
 306 FreeBSD 1.1.5.1         1994-07-xx [FBD]
 307                                 supersedes 1.1.5 3 days after release.
 308 NetBSD 1.0              1994-10-26 [NBD]
 309 386BSD 1.0              1994-11-12 [USE]
 310 FreeBSD 2.0             1995-01-xx [FBD]
 311 BSD/OS 2.0              1995-01-xx [BSDI] 4.4 lite based
 312 FreeBSD 2.0.5           1995-06-10 [FBD]
 313 BSD/OS 2.0.1            1995-06-xx [BSDI]
 314 4.4BSD Lite Release 2   1995-06-xx [44B]
 315                                 the true final distribution from the CSRG
 316 FreeBSD 2.1.0           1995-11-19 [FBD]
 317 NetBSD 1.1              1995-11-26 [NBD]
 318 BSD/OS 2.1              1996-01-xx [BSDI]
 319 FreeBSD 2.1.5           1996-07-14 [FBD]
 320 NetBSD 1.2              1996-10-04 [NBD]
 321 OpenBSD 2.0             1996-10-18 [OBD]
 322 FreeBSD 2.1.6           1996-11-16 [FBD]
 323 FreeBSD 2.1.6.1         1996-11-25 [FBD] (sendmail security release)
 324 Rhapsody                1997-xx-xx
 325 FreeBSD 2.1.7           1997-02-20 [FBD]
 326 BSD/OS 3.0              1997-02-xx [BSDI] 4.4 lite2 based
 327 FreeBSD 2.2.0           1997-03-16 [FBD]
 328 FreeBSD 2.2.1           1997-03-25 [FBD]
 329 FreeBSD 2.2.2           1997-05-16 [FBD]
 330 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
 331 OpenBSD 2.1             1997-06-01 [OBD]
 332 FreeBSD 2.2.5           1997-10-22 [FBD]
 333 OpenBSD 2.2             1997-12-01 [OBD]
 334 NetBSD 1.3              1998-01-04 [NBD]
 335 FreeBSD 2.2.6           1998-03-25 [FBD]
 336 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
 337 BSD/OS 3.1              1998-03-xx [BSDI]
 338 OpenBSD 2.3             1998-05-19 [OBD]
 339 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
 340 FreeBSD 2.2.7           1998-07-22 [FBD]
 341 BSD/OS 4.0              1998-08-xx [BSDI]
 342                                 2-lock MP support, ELF executables
 343 FreeBSD 3.0             1998-10-16 [FBD]
 344                                 FreeBSD-3.0 is a snapshot from -current,
 345                                 while 3.1 and 3.2 are from 3.x-stable which
 346                                 was branched quite some time after 3.0-release
 347 FreeBSD 2.2.8           1998-11-29 [FBD]
 348 OpenBSD 2.4             1998-12-01 [OBD]
 349 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
 350 FreeBSD 3.1             1999-02-15 [FBD]
 351 BSD/OS 4.0.1            1999-03-xx [BSDI]
 352 NetBSD 1.4              1999-05-12 [NBD]
 353 FreeBSD 3.2             1999-05-17 [FBD]
 354 OpenBSD 2.5             1999-05-19 [OBD]
 355 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
 356 FreeBSD 3.3             1999-09-17 [FBD]
 357 OpenBSD 2.6             1999-12-01 [OBD]
 358 FreeBSD 3.4             1999-12-20 [FBD]
 359 BSD/OS 4.1              1999-12-xx [BSDI]
 360 FreeBSD 4.0             2000-03-13 [FBD]
 361 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
 362 OpenBSD 2.7             2000-06-15 [OBD]
 363 FreeBSD 3.5             2000-06-24 [FBD]
 364 FreeBSD 4.1             2000-07-27 [FBD]
 365 FreeBSD 3.5.1           2000-07-28 [FBD]
 366 FreeBSD 4.1.1           2000-09-25 [FBD] (a network-only patch release)
 367 FreeBSD 4.2             2000-11-21 [FBD]
 368 NetBSD 1.4.3            2000-11-25 [NBD] (patch release)
 369 BSD/OS 4.2              2000-11-29 [BSDI]
 370 OpenBSD 2.8             2000-12-01 [OBD]
 371 NetBSD 1.5              2000-12-06 [NBD]
 372 Mac OS X 10.0           2001-03-24 [APL]
 373 FreeBSD 4.3             2001-04-20 [FBD]
 374 OpenBSD 2.9             2001-06-01 [OBD]
 375 NetBSD 1.5.1            2001-07-11 [NBD] (patch release)
 376 NetBSD 1.5.2            2001-09-13 [NBD] (patch release)
 377 FreeBSD 4.4             2001-09-18 [FBD]
 378 Mac OS X 10.1           2001-09-29 [APL]
 379 OpenBSD 3.0             2001-12-01 [OBD]
 380 FreeBSD 4.5             2002-01-29 [FBD]
 381 BSD/OS 4.3              2002-03-14 [WRS]
 382 OpenBSD 3.1             2002-05-19 [OBD]
 383 FreeBSD 4.6             2002-06-15 [FBD]
 384 NetBSD 1.5.3            2002-07-22 [NBD] (patch release)
 385 FreeBSD 4.6.2           2002-08-15 [FBD] (patch release)
 386 Mac OS X 10.2           2002-08-23 [APL]
 387 NetBSD 1.6              2002-09-14 [NBD]
 388 FreeBSD 4.7             2002-10-08 [FBD]
 389 OpenBSD 3.2             2002-11-01 [OBD]
 390 FreeBSD 5.0             2003-01-17 [FBD]
 391                                 FreeBSD 5.0 is a separate branch off of
 392                                 -current, similar to 3.0.
 393 FreeBSD 4.8             2003-04-03 [FBD]
 394 NetBSD 1.6.1            2003-04-21 [NBD] (patch release)
 395 OpenBSD 3.3             2003-05-01 [OBD]
 396 BSD/OS 5.0              2003-05-?? [WRS]
 397 FreeBSD 5.1             2003-06-09 [FBD]
 398 Mac OS X 10.3           2003-10-24 [APL]
 399 FreeBSD 4.9             2003-10-28 [FBD]
 400 BSD/OS 5.1 ISE          2003-10-?? [WRS] (final version)
 401 OpenBSD 3.4             2003-11-01 [OBD]
 402 FreeBSD 5.2             2004-01-12 [FBD]
 403 FreeBSD 5.2.1           2004-02-22 [FBD] (patch release)
 404 NetBSD 1.6.2            2004-03-01 [NBD] (patch release)
 405 OpenBSD 3.5             2004-04-01 [OBD]
 406 FreeBSD 4.10            2004-05-27 [FBD]
 407 DragonFly 1.0           2004-07-12 [DFB]
 408
 409 Bibliography
 410 ------------------------
 411
 412 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
 413 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
 414 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
 415
 416 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
 417 Company, Inc., 1994. ISBN 0-201-54777-5
 418
 419 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
 420 Quarterman. The Design and Implementation of the 4.4BSD Operating
 421 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
 422
 423 McKusick, Marshall Kirk, George Neville-Neil. The Design and
 424 Implementation of the FreeBSD Operating System.
 425 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
 426
 427 Doug McIlroy. Research Unix Reader.
 428
 429 Michael G. Brown. The Role of BSD in the Development of Unix.
 430 Presented to the Tasmanian Unix Special Interest Group of the
 431 Australian Computer Society, Hobart, August 1993.
 432
 433 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
 434 URL: http://www.byte.com/art/9410/sec8/art3.htm (unreachable)
 435
 436 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
 437 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
 438
 439 BSD Release Announcements collection.
 440 URL: http://www.de.FreeBSD.org/de/ftp/releases/
 441
 442 BSD Hypertext Man Pages
 443 URL: http://www.FreeBSD.org/cgi/man.cgi
 444
 445 UNIX history graphing project
 446 URL: http://minnie.tuhs.org/Unix_History/index.html
 447
 448 UNIX history
 449 URL: http://www.levenez.com/unix/
 450
 451 James Howard: The BSD Family Tree
 452 URL: http://www.daemonnews.org/200104/bsd_family.html
 453 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
 454
 455
 456 Acknowledgments
 457 ---------------
 458
 459 Josh Gilliam for suggestions, bug fixes, and finding very old
 460 original BSD announcements from Usenet or tapes.
 461
 462 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
 463
 464 --
 465 Copyright (c) 1997-2004 Wolfram Schneider <wosch@FreeBSD.ORG>
 466 URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree
 467
 468 $FreeBSD: src/share/misc/bsd-family-tree,v 1.21.2.14 2003/04/07 05:22:13 murray Exp $
 469 $DragonFly: src/share/misc/bsd-family-tree,v 1.5 2004/10/24 20:05:07 geekgod Exp $