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                2.79BSD
  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  |     FreeBSD 2.2.8 | |     |    |            |             |
 114  |         |         | |     |    |            |             |
 115  |         v         | |     |    |        OpenBSD 2.4       |
 116  |     FreeBSD 2.2.9 | |     |    |            |             |
 117  |                   | |     |    |            |             |
 118 FreeBSD 3.0 <--------* |     |    v            |             |
 119  |                     |     | NetBSD 1.3.3    |             |
 120  *---FreeBSD 3.1       |     |                 |             |
 121  |       |             |     |                 |           BSD/OS 4.0.1
 122  |   FreeBSD 3.2----*  |  .--*--NetBSD 1.4 OpenBSD 2.5       |
 123  |       |          |  |  |  |    |            |             |
 124  |       |          |  |  |  |    |            |             |
 125  |       |          |  |  |  |    |            |             |
 126  |   FreeBSD 3.3    |  |  |  | NetBSD 1.4.1    |             |
 127  |       |          |  |  |  |    |        OpenBSD 2.6       |
 128  |   FreeBSD 3.4    |  |  |  |    |            |             |
 129  |           |      |  |  |  |    |            |           BSD/OS 4.1
 130 FreeBSD 4.0  |      |  |  |  | NetBSD 1.4.2    |             |
 131  |           |      |  |  |  |    |            |             |
 132  |           |      |  |  |  |    |            |             |
 133  |   FreeBSD 3.5    |  |  |  |    |        OpenBSD 2.7       |
 134  |           |      |  |  |  |    |            |             |
 135  |   FreeBSD 3.5.1  |  |  |  |    |            |             |
 136  |                  |  |  |  |    |            |             |
 137  *---FreeBSD 4.1    |  |  |  |    |            |             |
 138  |      |           |  |  |  |    |            |             |
 139  |   FreeBSD 4.1.1  |  |  /  |    |            |             |
 140  |      |           |  | /   |    |            |             |
 141  |   FreeBSD 4.2   Darwin/   | NetBSD 1.4.3    |             |
 142  |      |         Mac OS X   |             OpenBSD 2.8     BSD/OS 4.2
 143  |      |             |      |                 |             |
 144  |      |             |      |                 |             |
 145  |      |           10.0     *--NetBSD 1.5     |             |
 146  |   FreeBSD 4.3      |      |    |            |             |
 147  |      |             |      |    |        OpenBSD 2.9       |
 148  |      |             |      | NetBSD 1.5.1    |             |
 149  |      |             |      |    |            |             |
 150  |   FreeBSD 4.4-.    |      | NetBSD 1.5.2    |             |
 151  |      |        | Mac OS X  |    |            |             |
 152  |      |        |   10.1    |    |        OpenBSD 3.0       |
 153  |   FreeBSD 4.5 |    |      |    |            |             |
 154  |      |         \   |      |    |            |           BSD/OS 4.3
 155  |   FreeBSD 4.6   \  |      |    |        OpenBSD 3.1       |
 156  |      |           \ |      | NetBSD 1.5.3    |             |
 157  |   FreeBSD 4.6.2 Mac OS X  |                 |             |
 158  |      |            10.2    |                 |             |
 159  |   FreeBSD 4.7      |      |                 |             |
 160  |      |             |      *--NetBSD 1.6 OpenBSD 3.2       |
 161  |   FreeBSD 4.8      |      |    |            |             |
 162  |      |             |      | NetBSD 1.6.1    |             |
 163  |      |--------.    |      |    |        OpenBSD 3.3     BSD/OS 5.0
 164  |      |         \   |      |    |            |             |
 165  |   FreeBSD 4.9   |  |      |    |        OpenBSD 3.4     BSD/OS 5.1 ISE
 166  |      |          |  |      |    |            |
 167  |      |          |  |      | NetBSD 1.6.2    |
 168  |      |          |  |      |    |            |
 169  |      |          |  |      |    |        OpenBSD 3.5
 170  |      |          |  |      |    v            |
 171  |   FreeBSD 4.10  |  |      |                 |
 172  |      |          |  |      |                 |
 173  |   FreeBSD 4.11  |  |      |                 |
 174  |                 |  |      |                 |
 175  |                  `-|------|-----------------|---------------------.
 176  |                    |      |                 |                      \
 177 FreeBSD 5.0           |      |                 |                       |
 178  |                    |      |                 |                       |
 179 FreeBSD 5.1           |      |                 |               DragonFly 1.0
 180  |          \         |      |                 |                       |
 181  |           ----- Mac OS X  |                 |                       |
 182  |                   10.3    |                 |                       |
 183 FreeBSD 5.2           |      |                 |                       |
 184  |      |             |      |                 |                       |
 185  |   FreeBSD 5.2.1    |      |                 |                       |
 186  |                    |      |                 |                       |
 187  *-------FreeBSD 5.3  |      |                 |                       |
 188  |           |        |      |             OpenBSD 3.6                 |
 189  |           |        |      *--NetBSD 2.0     |                       |
 190  |           |        |      | |  |            |               DragonFly 1.2.0
 191  |           |     Mac OS X  | | NetBSD 2.0.2  |                       |
 192  |           |       10.4    | |  |            |                       |
 193  |       FreeBSD 5.4  |      | |  |            |                       |
 194  |           |        |      | |  |        OpenBSD 3.7                 |
 195  |           |        |      | | NetBSD 2.0.3  |                       |
 196  |           |        |      | |  |            |                       |
 197  *--FreeBSD  |        |      | |  v        OpenBSD 3.8                 |
 198  |    6.0    |        |      | |               |                       |
 199  |     |     |        |      |  \              |                       |
 200  |     |     |        |      | NetBSD 2.1      |                       |
 201  |     |     |        |      |                 |                       |
 202  |     |     |        |      *--NetBSD 3.0     |                       |
 203  |     |     |        |      | |  |            |               DragonFly 1.4.0
 204  |     |     |        |      | |  |        OpenBSD 3.9                 |
 205  |  FreeBSD  |        |      | |  |            |                       |
 206  |    6.1    |        |      | |  |            |                       |
 207  |     |  FreeBSD 5.5 |      | |  |            |                       |
 208  |     |              |      | | NetBSD 3.0.1  |               DragonFly 1.6.0
 209  |     |              |      | |  |            |                       |
 210  |     |              |      | |  |        OpenBSD 4.0                 |
 211  |     |              |      | | NetBSD 3.0.2  |                       |
 212  |     |              |      | NetBSD 3.1      |                       |
 213  | FreeBSD 6.2        |      |                 |                       |
 214  |     |              |      |                 |               DragonFly 1.8.0
 215  |     |              |      |             OpenBSD 4.1                 |
 216  |     |              |      |                 |               DragonFly 1.10.0
 217  |     |           Mac OS X  |                 |                       |
 218  |     |             10.5    |                 |                       |
 219  |     |              |      |             OpenBSD 4.2                 |
 220  |     |              |      *--NetBSD 4.0     |                       |
 221  | FreeBSD 6.3        |      |    |            |                       |
 222  |            \       |      |    |            |                       |
 223  *--FreeBSD    |      |      |    |            |               DragonFly 1.12.0
 224  |    7.0      |      |      |    |            |                       |
 225  |     |       |      |      |    |        OpenBSD 4.3                 |
 226  |     |       |      |      | NetBSD          |               DragonFly 2.0.0
 227  |     |    FreeBSD   |      |  4.0.1      OpenBSD 4.4                 |
 228  |     |      6.4     |      |                 |                       |
 229  |     |              |      |                 |                       |
 230  |  FreeBSD 7.1       |      |                 |                       |
 231  |     |              |      |                 |               DragonFly 2.2.0
 232  |  FreeBSD 7.2       |      *--NetBSD     OpenBSD 4.5                 |
 233  |             \      |      |   5.0           |                       |
 234  |             \      |      |  / | \          |                       |
 235  |              |  Mac OS X  |  | |  \         |                       |
 236  |              |    10.6    |  | |   \        |                       |
 237  |              |     |      |  | | NetBSD     |               DragonFly 2.4.0
 238  |              |     |      |  | |  5.0.1 OpenBSD 4.6                 |
 239  |              |     |      |  | |    |       |                       |
 240  *--FreeBSD     |     |      |  | |    |       |                       |
 241  |    8.0       |     |      |  | |    |       |                       |
 242  |     |     FreeBSD  |      |  | | NetBSD     |                       |
 243  |     |       7.3    |      |  | |  5.0.2     |               DragonFly 2.6.0
 244  |     |        |     |      |  | |        OpenBSD 4.7                 |
 245  |  FreeBSD     |     |      |  | |            |                       |
 246  |    8.1       |     |      |  | |            |                       |
 247  |     |        |     |      |  | |            |               DragonFly 2.8.2
 248  |     |        |     |      |  | |        OpenBSD 4.8                 |
 249  |     |        |     |      |  | *--NetBSD    |                       |
 250  |  FreeBSD  FreeBSD  |      |  |    5.1       |                       |
 251  |    8.2      7.4    |      |  |     |        |               DragonFly 2.10.1
 252  |     |              |      |  |     |    OpenBSD 4.9                 |
 253  |     `-----.     Mac OS X  |  |     |        |                       |
 254  |            \      10.7    |  |     |        |                       |
 255  |             |      |      |  |     |    OpenBSD 5.0                 |
 256  *--FreeBSD    |      |      |  |     |        |                       |
 257  |    9.0      |      |      |  |  NetBSD      |               DragonFly 3.0.1
 258  |     |    FreeBSD   |      |  |   5.1.2      |                       |
 259  |     |      8.3     |      |  |     |        |                       |
 260  |     |       |      |      |  |  NetBSD      |                       |
 261  |     |       |      |      |  |   5.1.3      |                       |
 262  |     |       |      |      |  |     |        |                       |
 263  |     |       |      |      |  |  NetBSD      |                       |
 264  |     |       |      |      |  |   5.1.4      |                       |
 265  |     |       |      |      |  |          OpenBSD 5.1                 |
 266  |     |       |   Mac OS X  |  `--------.     |                       |
 267  |     |       |     10.8    |           |     |                       |
 268  |     |       |      |      *--NetBSD   |     |                       |
 269  |     |       |      |      |    6.0    |     |                       |
 270  |     |       |      |      |    | |    | OpenBSD 5.2         DragonFly 3.2.1
 271  |  FreeBSD    |      |      |    | | NetBSD   |                       |
 272  |    9.1      |      |      |    | |   5.2    |                       |
 273  |     |       |      |      |    | |    |     |                       |
 274  |     |       |      |      |    | | NetBSD   |                       |
 275  |     |       |      |      |    | |  5.2.1   |                       |
 276  |     |       |      |      |    | |    |     |                       |
 277  |     |       |      |      |    | | NetBSD   |                       |
 278  |     |       |      |      |    | |  5.2.2   |                       |
 279  |     |       |      |      |    | |          |                       |
 280  |     |       |      |      |    |  \         |                       |
 281  |     |       |      |      |    |   NetBSD   |                       |
 282  |     |       |      |      |    |    6.0.1   |                       |
 283  |     |       |      |      |    |      | OpenBSD 5.3         DragonFly 3.4.1
 284  |     |       |      |      |    |   NetBSD   |                       |
 285  |     |       |      |      |    |    6.0.2   |                       |
 286  |     |       |      |      |    |      |     |                       |
 287  |     |       |      |      |    |   NetBSD   |                       |
 288  |     |       |      |      |    |    6.0.3   |                       |
 289  |     |       |      |      |    |      |     |                       |
 290  |     |       |      |      |    |   NetBSD   |                       |
 291  |     |       |      |      |    |    6.0.4   |                       |
 292  |     |       |      |      |    |      |     |                       |
 293  |     |       |      |      |    |   NetBSD   |                       |
 294  |     |       |      |      |    |    6.0.5   |                       |
 295  |     |       |      |      |    |      |     |                       |
 296  |     |       |      |      |    |   NetBSD   |                       |
 297  |     |       |      |      |    |    6.0.6   |                       |
 298  |     |       |      |      |    |            |                       |
 299  |     |       |      |      |    *--NetBSD    |                       |
 300  |     |       |      |      |         6.1     |                       |
 301  |     |    FreeBSD   |      |          |      |                       |
 302  |     |      8.4     |      |       NetBSD    |                       |
 303  |     |       |      |      |        6.1.1    |                       |
 304  |     |              |      |          |      |                       |
 305  |  FreeBSD           |      |       NetBSD    |                       |
 306  |    9.2             |      |        6.1.2    |                       |
 307  |     |           Mac OS X  |          |      |                       |
 308  |     |             10.9    |          |  OpenBSD 5.4                 |
 309  |     `-----.        |      |          |      |               DragonFly 3.6.0
 310  |            \       |      |          |      |                       |
 311  *--FreeBSD    |      |      |       NetBSD    |                       |
 312  |   10.0      |      |      |        6.1.3    |                       |
 313  |     |       |      |      |          |      |                       |
 314  |     |       |      |      |          |      |               DragonFly 3.6.1
 315  |     |       |      |      |          |      |                       |
 316  |     |       |      |      |          |      |                       |
 317  |     |       |      |      |          |      |               DragonFly 3.6.2
 318  |     |       |      |      |       NetBSD    |                       |
 319  |     |       |      |      |        6.1.4    |                       |
 320  |     |       |      |      |          |      |                       |
 321  |     |       |      |      |          |  OpenBSD 5.5                 |
 322  |     |       |      |      |          |      |                       |
 323  |     |       |      |      |          |      |               DragonFly 3.8.0
 324  |     |       |      |      |          |      |                       |
 325  |     |       |      |      |          |      |                       |
 326  |     |       |      |      |          |      |               DragonFly 3.8.1
 327  |     |       |      |      |          |      |                       |
 328  |     |       |      |      |          |      |                       |
 329  |     |       |      |      |          |      |               DragonFly 3.6.3
 330  |     |       |      |      |          |      |                       |
 331  |     |    FreeBSD   |      |          |      |                       |
 332  |     |      9.3     |      |          |      |                       |
 333  |     |              |      |       NetBSD    |               DragonFly 3.8.2
 334  |     |              |      |        6.1.5    |                       |
 335  |     |           Mac OS X  |                 |                       |
 336  |     |             10.10   |                 |                       |
 337  |     |              |      |             OpenBSD 5.6                 |
 338  |  FreeBSD           |      |                 |                       |
 339  |   10.1             |      |                 |               DragonFly 4.0.1
 340  |     |              |      |                 |                       |
 341  |     |              |      |                 |               DragonFly 4.0.2
 342  |     |              |      |                 |                       |
 343  |     |              |      |                 |               DragonFly 4.0.3
 344  |     |              |      |                 |                       |
 345  |     |              |      |                 |               DragonFly 4.0.4
 346  |     |              |      |                 |                       |
 347  |     |              |      |                 |               DragonFly 4.0.5
 348  |     |              |      |                 |                       |
 349  |     |              |      |             OpenBSD 5.7                 |
 350  |     |              |      |                 |               DragonFly 4.2.0
 351  |  FreeBSD           |      |                 |                       |
 352  |   10.2             |      |                 |                       |
 353  |     |            macOS    *--NetBSD 7.0     |                       |
 354  |     |            10.11    |   | |       OpenBSD 5.8                 |
 355  |     |              |      |   | `--.        |               DragonFly 4.4.1
 356  |  FreeBSD           |      |   |    |    OpenBSD 5.9                 |
 357  |   10.3             |      |   |    |        |                       |
 358  |     |              |      |   | NetBSD      |                       |
 359  |     |              |      |   |  7.0.1      |                       |
 360  |     `------.       |      |   |    |        |               DragonFly 4.6.0
 361  |            |       |      |   |    |        |                       |
 362  |            |       |      |   |    |        |                       |
 363  *--FreeBSD   |     macOS    |   |    |    OpenBSD 6.0                 |
 364  |   11.0     |     10.12    |   | NetBSD      |                       |
 365  |     |      |       |      |   |  7.0.2      |                       |
 366  |     |      |       |      |   |             |                       |
 367  |     |      |       |      |   *--NetBSD     |                       |
 368  |     |      |       |      |   |   7.1       |                       |
 369  |     |      |       |      |   |    |        |                       |
 370  |     |      |       |      |   |    |        |                       |
 371  |     |      |     macOS    |   |    |        |               DragonFly 4.8.0
 372  |     |      |     10.13    |   |    |    OpenBSD 6.1                 |
 373  |  FreeBSD   |       |      |   |    |        |               DragonFly 5.0.0
 374  |   11.1  FreeBSD    |      |   |    |        |                       |
 375  |     |    10.4      |      |   |    |    OpenBSD 6.2         DragonFly 5.0.1
 376  |     |              |      |   |    |        |                       |
 377  |     `------.       |      |   | NetBSD      |               DragonFly 5.0.2
 378  |            |       |      |   |  7.1.1      |                       |
 379  |            |       |      |   |    |        |                       |
 380  |            |       |      |   | NetBSD      |                       |
 381  |            |       |      |   |  7.1.2      `--.                    |
 382  |            |       |      |   |                |                    |
 383  |            |       |      |   `-----.      OpenBSD 6.3              |
 384  |            |       |      *--NetBSD |          |            DragonFly 5.2.0
 385  |            |       |      |   8.0   |          |                    |
 386  |            |       |      |   |     |          |            DragonFly 5.2.1
 387  |            |       |      |   |     |          |                    |
 388  |            |       |      |   |     |          |            DragonFly 5.2.2
 389  |         FreeBSD    |      |   |     *--NetBSD  |                    |
 390  |           11.2     |      |   |         7.2    |                    |
 391  |                  macOS    |   |         |      |                    |
 392  |                  10.14    |   |         |  OpenBSD 6.4              |
 393  |                    |      |   |         |      |                    |
 394  |                    |      |   |         |      |            DragonFly 5.4.0
 395  *--FreeBSD           |      |   |         v      |                    |
 396  |   12.0             |      |   |                |            DragonFly 5.4.1
 397  |     |              |      |   |            OpenBSD 6.5              |
 398  |     |              |      |   |                |                    |
 399  |     |              |      |  NetBSD            |                    |
 400  |     |              |      |   8.1              |            DragonFly 5.6
 401  |     |              |      |                    |                    |
 402  |     |              |      |                    |            DragonFly 5.6.1
 403  |  FreeBSD           |      |                OpenBSD 6.6              |
 404  |   12.1             |      |                    |                    |
 405  |     |              |      |                    |                    |
 406  |     v              |      |                    |                    |
 407  |                    |      |                    |                    |
 408 FreeBSD 13 -current   |  NetBSD -current   OpenBSD -current   DragonFly -current
 409  |                    |      |                    |                    |
 410  v                    v      v                    v                    v
 411
 412 Time
 413 ----------------
 414
 415 Time tolerance +/- 6 months, depending on which book/article you read; if it
 416 was the announcement in Usenet or if it was available as tape.
 417
 418 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
 419         and John Quarterman. The Design and Implementation of
 420         the 4.4BSD Operating System.
 421 [APL] Apple website [https://www.apple.com/macosx/]
 422 [BSDI] Berkeley Software Design, Inc.
 423 [DFB] DragonFlyBSD Project, The.
 424 [DOC] README, COPYRIGHT on tape.
 425 [FBD] FreeBSD Project, The.
 426 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
 427         Volume 11, Info 4, April, 1987.
 428 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
 429         comp.bugs.4bsd.ucb-fixes, June 15, 1988.
 430 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
 431         Changes in the Kernel in 2.9BSD. Second Berkeley Software
 432         Distribution UNIX Version 2.9, July, 1983.
 433 [NBD] NetBSD Project, The.
 434 [OBD] OpenBSD Project, The.
 435 [QCU] Salus, Peter H. A quarter century of UNIX.
 436 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
 437 [TUHS] The Unix Historical Society.  http://minnie.tuhs.org/Unix_History/.
 438 [USE] Usenet announcement.
 439 [WRS] Wind River Systems, Inc.
 440 [dmr] Dennis Ritchie, via E-Mail
 441
 442 Multics                 1965
 443 UNIX                    Summer 1969
 444                                 DEC PDP-7
 445 First   Edition         1971-11-03 [QCU]
 446                                 DEC PDP-11/20, Assembler
 447 Second  Edition         1972-06-12 [QCU]
 448                                 10 UNIX installations
 449 Third   Edition         1973-02-xx [QCU]
 450                                 Pipes, 16 installations
 451 Fourth  Edition         1973-11-xx [QCU]
 452                                 rewriting in C effected,
 453                                 above 30 installations
 454 Fifth   Edition         1974-06-xx [QCU]
 455                                 above 50 installations
 456 Sixth   Edition         1975-05-xx [QCU]
 457                                 port to DEC Vax
 458 Seventh Edition         1979-01-xx [QCU] 1979-01-10 [TUHS]
 459                                 first portable UNIX
 460 Eighth  Edition         1985-02-xx [QCU]
 461                                 VAX 11/750, VAX 11/780 [dmr]
 462                                 descended from 4.1c BSD [dmr]
 463                                 descended from 4.1 BSD [44B]
 464                         scooping-out and replacement of the character-device
 465                         and networking part by the streams mechanism
 466
 467 Ninth   Edition         1986-09-xx [QCU]
 468 Tenth   Edition         1989-10-xx [QCU]
 469
 470 1BSD                    late 1977
 471                         1978-03-09 [QCU]
 472                                 PDP-11, Pascal, ex(1)
 473                                 30 free copies of 1BSD sent out
 474                                 35 tapes sold for 50 USD [QCU]
 475 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
 476                                 75 2BSD tapes shipped
 477 2.79BSD                 1980-04-xx [TUHS]
 478 2.8BSD                  1981-07-xx [KSJ]
 479
 480 2.8.1BSD                1982-01-xx [QCU]
 481                                 set of performance improvements
 482 2.9BSD                  1983-07-xx [KSJ]
 483 2.9.1BSD                1983-11-xx [TUHS]
 484 2.9BSD-Seismo           1985-08-xx [SMS]
 485 2.10BSD                 1987-04-xx [KKK]
 486 2.10.1BSD               1989-01-xx [SMS]
 487 2.11BSD                 1992-02-xx [SMS]
 488 2.11BSD rev #430        1999-12-13 [SMS]
 489
 490 32V                     1978-1[01]-xx [QCU] 1979-03-26 [TUHS]
 491 3BSD                    late 1979 [QCU] March 1980 [TUHS]
 492                                 virtual memory, page replacement,
 493                                 demand paging
 494 4.0BSD                  1980-10-xx
 495 4.1BSD                  1981-07-08 [DOC]
 496 4.1aBSD                 1982-04-xx
 497                                 alpha release, 100 sites, networking [44B]
 498 4.1bBSD                         internal release, fast filesystem [44B]
 499 4.1cBSD                 late 1982
 500                                 beta release, IPC [44B]
 501 4.2BSD                  1983-09-xx [QCU]
 502                         1983-08-03 [DOC]
 503 4.3BSD                  1986-06-xx [QCU]
 504                         1986-04-05 [KB], [DOC]
 505 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
 506 4.3BSD NET/1            1988-11-xx [QCU]
 507                         1989-01-01 [DOC]
 508 4.3BSD Reno             1990-06-29 [QCU], [DOC]
 509 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
 510
 511 BSD/386 ALPHA           1991-12-xx [BSDI]
 512                                 first code released to people outside BSDI
 513 386BSD 0.0              1992-02-xx [DOC]
 514 BSD/386 0.3.1           1992-04-xx [BSDI] first ext. beta; B customers
 515 BSD/386 0.3.3           1992-06-xx [BSDI] first CDROM version
 516 386BSD 0.1              1992-07-28 [DOC]
 517 4.4BSD Alpha            1992-07-07
 518 BSD/386 0.9.3           1992-10-xx [BSDI]
 519                                 first external gamma; G customers
 520 BSD/386 0.9.4           1992-12-xx [BSDI]
 521                                 would have been 1.0 except for request
 522                                 for preliminary injunction
 523 BSD/386 1.0             1993-03-xx [BSDI]
 524                                 injunction denied; first official release
 525 NetBSD 0.8              1993-04-20 [NBD]
 526 4.4BSD                  1993-06-01 [USE]
 527 NetBSD 0.9              1993-08-23 [NBD]
 528 FreeBSD 1.0             1993-11-01 [FBD]
 529 FreeBSD 1.0.2           1993-11-14 [FBD]
 530                                 supersedes 1.0 13 days after release.
 531 BSD/386 1.1             1994-02-xx [BSDI]
 532 4.4BSD Lite             1994-03-01 [USE]
 533 FreeBSD 1.1             1994-05-07 [FBD]
 534 FreeBSD 1.1.5           1994-06-30 [FBD]
 535 FreeBSD 1.1.5.1         1994-07-05 [FBD]
 536                                 supersedes 1.1.5 5 days after release.
 537 NetBSD 1.0              1994-10-26 [NBD]
 538 386BSD 1.0              1994-11-12 [USE]
 539 FreeBSD 2.0             1994-11-23 [FBD]
 540 BSD/OS 2.0              1995-01-xx [BSDI] 4.4 lite based
 541 FreeBSD 2.0.5           1995-06-10 [FBD]
 542 BSD/OS 2.0.1            1995-06-xx [BSDI]
 543 4.4BSD Lite Release 2   1995-06-xx [44B]
 544                                 the true final distribution from the CSRG
 545 FreeBSD 2.1.0           1995-11-19 [FBD]
 546 NetBSD 1.1              1995-11-26 [NBD]
 547 BSD/OS 2.1              1996-01-xx [BSDI]
 548 FreeBSD 2.1.5           1996-07-14 [FBD]
 549 NetBSD 1.2              1996-10-04 [NBD]
 550 OpenBSD 2.0             1996-10-18 [OBD]
 551 FreeBSD 2.1.6           1996-11-16 [FBD]
 552 FreeBSD 2.1.6.1         1996-11-25 [FBD] (sendmail security release)
 553 Rhapsody                1997-xx-xx
 554 FreeBSD 2.1.7           1997-02-20 [FBD]
 555 BSD/OS 3.0              1997-02-xx [BSDI] 4.4 lite2 based
 556 FreeBSD 2.2.0           1997-03-16 [FBD]
 557 FreeBSD 2.2.1           1997-03-25 [FBD]
 558 FreeBSD 2.2.2           1997-05-16 [FBD]
 559 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
 560 OpenBSD 2.1             1997-06-01 [OBD]
 561 FreeBSD 2.2.5           1997-10-22 [FBD]
 562 OpenBSD 2.2             1997-12-01 [OBD]
 563 NetBSD 1.3              1998-01-04 [NBD]
 564 FreeBSD 2.2.6           1998-03-25 [FBD]
 565 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
 566 BSD/OS 3.1              1998-03-xx [BSDI]
 567 OpenBSD 2.3             1998-05-19 [OBD]
 568 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
 569 FreeBSD 2.2.7           1998-07-22 [FBD]
 570 BSD/OS 4.0              1998-08-xx [BSDI]
 571                                 2-lock MP support, ELF executables
 572 FreeBSD 3.0             1998-10-16 [FBD]
 573                                 FreeBSD-3.0 is a snapshot from -current,
 574                                 while 3.1 and 3.2 are from 3.x-stable which
 575                                 was branched quite some time after 3.0-release
 576 FreeBSD 2.2.8           1998-11-29 [FBD]
 577 OpenBSD 2.4             1998-12-01 [OBD]
 578 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
 579 FreeBSD 3.1             1999-02-15 [FBD]
 580 BSD/OS 4.0.1            1999-03-xx [BSDI]
 581 NetBSD 1.4              1999-05-12 [NBD]
 582 FreeBSD 3.2             1999-05-17 [FBD]
 583 OpenBSD 2.5             1999-05-19 [OBD]
 584 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
 585 FreeBSD 3.3             1999-09-17 [FBD]
 586 OpenBSD 2.6             1999-12-01 [OBD]
 587 FreeBSD 3.4             1999-12-20 [FBD]
 588 BSD/OS 4.1              1999-12-xx [BSDI]
 589 FreeBSD 4.0             2000-03-13 [FBD]
 590 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
 591 OpenBSD 2.7             2000-06-15 [OBD]
 592 FreeBSD 3.5             2000-06-24 [FBD]
 593 FreeBSD 4.1             2000-07-27 [FBD]
 594 FreeBSD 3.5.1           2000-07-28 [FBD]
 595 FreeBSD 4.1.1           2000-09-25 [FBD] (a network-only patch release)
 596 FreeBSD 4.2             2000-11-21 [FBD]
 597 NetBSD 1.4.3            2000-11-25 [NBD] (patch release)
 598 BSD/OS 4.2              2000-11-29 [BSDI]
 599 OpenBSD 2.8             2000-12-01 [OBD]
 600 NetBSD 1.5              2000-12-06 [NBD]
 601 Mac OS X 10.0           2001-03-24 [APL]
 602 FreeBSD 4.3             2001-04-20 [FBD]
 603 OpenBSD 2.9             2001-06-01 [OBD]
 604 NetBSD 1.5.1            2001-07-11 [NBD] (patch release)
 605 NetBSD 1.5.2            2001-09-13 [NBD] (patch release)
 606 FreeBSD 4.4             2001-09-18 [FBD]
 607 Mac OS X 10.1           2001-09-29 [APL]
 608 OpenBSD 3.0             2001-12-01 [OBD]
 609 FreeBSD 4.5             2002-01-29 [FBD]
 610 BSD/OS 4.3              2002-03-14 [WRS]
 611 OpenBSD 3.1             2002-05-19 [OBD]
 612 FreeBSD 4.6             2002-06-15 [FBD]
 613 NetBSD 1.5.3            2002-07-22 [NBD] (patch release)
 614 FreeBSD 4.6.2           2002-08-15 [FBD] (patch release)
 615 Mac OS X 10.2           2002-08-23 [APL]
 616 NetBSD 1.6              2002-09-14 [NBD]
 617 FreeBSD 4.7             2002-10-08 [FBD]
 618 OpenBSD 3.2             2002-11-01 [OBD]
 619 FreeBSD 5.0             2003-01-17 [FBD]
 620                                 FreeBSD 5.0 is a separate branch off of
 621                                 -current, similar to 3.0.
 622 FreeBSD 4.8             2003-04-03 [FBD]
 623 NetBSD 1.6.1            2003-04-21 [NBD] (patch release)
 624 OpenBSD 3.3             2003-05-01 [OBD]
 625 BSD/OS 5.0              2003-05-?? [WRS]
 626 FreeBSD 5.1             2003-06-09 [FBD]
 627 Mac OS X 10.3           2003-10-24 [APL]
 628 FreeBSD 4.9             2003-10-28 [FBD]
 629 BSD/OS 5.1 ISE          2003-10-?? [WRS] (final version)
 630 OpenBSD 3.4             2003-11-01 [OBD]
 631 FreeBSD 5.2             2004-01-12 [FBD]
 632 FreeBSD 5.2.1           2004-02-22 [FBD] (patch release)
 633 NetBSD 1.6.2            2004-03-01 [NBD] (patch release)
 634 OpenBSD 3.5             2004-04-01 [OBD]
 635 FreeBSD 4.10            2004-05-27 [FBD]
 636 DragonFly 1.0           2004-07-12 [DFB]
 637 OpenBSD 3.6             2004-10-29 [OBD]
 638 FreeBSD 5.3             2004-11-06 [FBD]
 639 NetBSD 2.0              2004-12-09 [NBD]
 640 FreeBSD 4.11            2005-01-25 [FBD]
 641 DragonFly 1.2.0         2005-04-08 [DFB]
 642 NetBSD 2.0.2            2005-04-14 [NBD] (security/critical release)
 643 Mac OS X 10.4           2005-04-29 [APL]
 644 FreeBSD 5.4             2005-05-09 [FBD]
 645 OpenBSD 3.7             2005-05-19 [OBD]
 646 NetBSD 2.0.3            2005-10-31 [NBD] (security/critical release)
 647 OpenBSD 3.8             2005-11-01 [OBD]
 648 FreeBSD 6.0             2005-11-01 [FBD]
 649 NetBSD 2.1              2005-11-02 [NBD]
 650 NetBSD 3.0              2005-12-23 [NBD]
 651 DragonFly 1.4.0         2006-01-08 [DFB]
 652 FreeBSD 2.2.9           2006-04-01 [FBD]
 653 OpenBSD 3.9             2006-05-01 [OBD]
 654 FreeBSD 6.1             2006-05-08 [FBD]
 655 FreeBSD 5.5             2006-05-25 [FBD]
 656 NetBSD 3.0.1            2006-07-24 [NBD] (security/critical release)
 657 DragonFly 1.6.0         2006-07-24 [DFB]
 658 OpenBSD 4.0             2006-11-01 [OBD]
 659 NetBSD 3.0.2            2006-11-04 [NBD] (security/critical release)
 660 NetBSD 3.1              2006-11-04 [NBD]
 661 FreeBSD 6.2             2007-01-15 [FBD]
 662 DragonFly 1.8.0         2007-01-30 [DFB]
 663 OpenBSD 4.1             2007-05-01 [OBD]
 664 DragonFly 1.10.0        2007-08-06 [DFB]
 665 Mac OS X 10.5           2007-10-26 [APL]
 666 OpenBSD 4.2             2007-11-01 [OBD]
 667 NetBSD 4.0              2007-12-19 [NBD]
 668 FreeBSD 6.3             2008-01-18 [FBD]
 669 DragonFly 1.12.0        2008-02-26 [DFB]
 670 FreeBSD 7.0             2008-02-27 [FBD]
 671 OpenBSD 4.3             2008-05-01 [OBD]
 672 DragonFly 2.0.0         2008-07-21 [DFB]
 673 OpenBSD 4.4             2008-11-01 [OBD]
 674 FreeBSD 6.4             2008-11-28 [FBD]
 675 FreeBSD 7.1             2009-01-04 [FBD]
 676 DragonFly 2.2.0         2009-02-17 [DFB]
 677 NetBSD 5.0              2009-04-29 [NBD]
 678 OpenBSD 4.5             2009-05-01 [OBD]
 679 FreeBSD 7.2             2009-05-04 [FBD]
 680 Mac OS X 10.6           2009-06-08 [APL]
 681 NetBSD 5.0.1            2009-08-02 [NBD] (security/critical release)
 682 DragonFly 2.4.0         2009-09-16 [DFB]
 683 OpenBSD 4.6             2009-10-18 [OBD]
 684 FreeBSD 8.0             2009-11-26 [FBD]
 685 NetBSD 5.0.2            2010-02-12 [NBD] (security/critical release)
 686 FreeBSD 7.3             2010-03-23 [FBD]
 687 DragonFly 2.6.0         2010-03-28 [DFB]
 688 OpenBSD 4.7             2010-05-19 [OBD]
 689 FreeBSD 8.1             2010-07-24 [FBD]
 690 DragonFly 2.8.2         2010-10-30 [DFB]
 691 OpenBSD 4.8             2010-11-01 [OBD]
 692 NetBSD 5.1              2010-11-19 [NBD]
 693 FreeBSD 7.4             2011-02-24 [FBD]
 694 FreeBSD 8.2             2011-02-24 [FBD]
 695 DragonFly 2.10.1        2011-04-26 [DFB]
 696 OpenBSD 4.9             2011-05-01 [OBD]
 697 Mac OS X 10.7           2011-07-20 [APL]
 698 OpenBSD 5.0             2011-11-01 [OBD]
 699 FreeBSD 9.0             2012-01-12 [FBD]
 700 NetBSD 5.1.2            2012-02-02 [NBD] (security/critical release)
 701 DragonFly 3.0.1         2012-02-21 [DFB]
 702 FreeBSD 8.3             2012-04-18 [FBD]
 703 OpenBSD 5.1             2012-05-01 [OBD]
 704 Mac OS X 10.8           2012-07-25 [APL]
 705 NetBSD 6.0              2012-10-17 [NBD]
 706 OpenBSD 5.2             2012-11-01 [OBD]
 707 DragonFly 3.2.1         2012-11-02 [DFB]
 708 NetBSD 5.2              2012-12-03 [NBD]
 709 NetBSD 6.0.1            2012-12-26 [NBD] (security/critical release)
 710 FreeBSD 9.1             2012-12-30 [FBD]
 711 DragonFly 3.4.1         2013-04-29 [DFB]
 712 OpenBSD 5.3             2013-05-01 [OBD]
 713 NetBSD 6.0.2            2013-05-18 [NBD] (security/critical release)
 714 NetBSD 6.1              2013-05-18 [NBD]
 715 FreeBSD 8.4             2013-06-07 [FBD]
 716 NetBSD 6.1.1            2013-08-22 [NBD]
 717 NetBSD 5.1.3            2013-09-29 [NBD]
 718 NetBSD 5.2.1            2013-09-29 [NBD]
 719 FreeBSD 9.2             2013-09-30 [FBD]
 720 NetBSD 6.0.3            2013-09-30 [NBD]
 721 NetBSD 6.1.2            2013-09-30 [NBD]
 722 Mac OS X 10.9           2013-10-22 [APL]
 723 OpenBSD 5.4             2013-11-01 [OBD]
 724 DragonFly 3.6.0         2013-11-25 [DFB]
 725 FreeBSD 10.0            2014-01-20 [FBD]
 726 NetBSD 5.1.4            2014-01-25 [NBD]
 727 NetBSD 5.2.2            2014-01-25 [NBD]
 728 NetBSD 6.0.4            2014-01-25 [NBD]
 729 NetBSD 6.1.3            2014-01-25 [NBD]
 730 DragonFly 3.6.1         2014-02-22 [DFB]
 731 DragonFly 3.6.2         2014-04-10 [DFB]
 732 NetBSD 6.0.5            2014-04-12 [NBD]
 733 NetBSD 6.1.4            2014-04-12 [NBD]
 734 OpenBSD 5.5             2014-05-01 [OBD]
 735 DragonFly 3.8.0         2014-06-04 [DFB]
 736 DragonFly 3.8.1         2014-06-16 [DFB]
 737 DragonFly 3.6.3         2014-06-17 [DFB]
 738 FreeBSD 9.3             2014-07-05 [FBD]
 739 DragonFly 3.8.2         2014-08-08 [DFB]
 740 NetBSD 6.0.6            2014-09-22 [NBD]
 741 NetBSD 6.1.5            2014-09-22 [NBD]
 742 Mac OS X 10.10          2014-10-16 [APL]
 743 OpenBSD 5.6             2014-11-01 [OBD]
 744 FreeBSD 10.1            2014-11-14 [FBD]
 745 DragonFly 4.0.1         2014-11-25 [DFB]
 746 DragonFly 4.0.2         2015-01-07 [DFB]
 747 DragonFly 4.0.3         2015-01-21 [DFB]
 748 DragonFly 4.0.4         2015-03-09 [DFB]
 749 DragonFly 4.0.5         2015-03-23 [DFB]
 750 OpenBSD 5.7             2015-05-01 [OBD]
 751 DragonFly 4.2.0         2015-06-29 [DFB]
 752 FreeBSD 10.2            2015-08-13 [FBD]
 753 NetBSD 7.0              2015-09-25 [NBD]
 754 OS X 10.11              2015-09-30 [APL]
 755 OpenBSD 5.8             2015-10-18 [OBD]
 756 DragonFly 4.4.1         2015-12-07 [DFB]
 757 OpenBSD 5.9             2016-03-29 [OBD]
 758 FreeBSD 10.3            2016-04-04 [FBD]
 759 NetBSD 7.0.1            2016-05-22 [NBD]
 760 DragonFly 4.6.0         2016-08-02 [DFB]
 761 OpenBSD 6.0             2016-09-01 [OBD]
 762 macOS 10.12             2016-09-20 [APL]
 763 FreeBSD 11.0            2016-10-10 [FBD]
 764 NetBSD 7.0.2            2016-10-21 [NBD]
 765 NetBSD 7.1              2017-03-11 [NBD]
 766 DragonFly 4.8.0         2017-03-27 [DFB]
 767 OpenBSD 6.1             2017-04-11 [OBD]
 768 FreeBSD 11.1            2017-07-26 [FBD]
 769 macOS 10.13             2017-09-25 [APL]
 770 FreeBSD 10.4            2017-10-03 [FBD]
 771 OpenBSD 6.2             2017-10-09 [OBD]
 772 DragonFly 5.0.0         2017-10-16 [DFB]
 773 DragonFly 5.0.1         2017-11-06 [DFB]
 774 DragonFly 5.0.2         2017-12-04 [DFB]
 775 NetBSD 7.1.1            2017-12-22 [NBD]
 776 NetBSD 7.1.2            2018-03-15 [NBD]
 777 OpenBSD 6.3             2018-04-02 [OBD]
 778 DragonFly 5.2.0         2018-04-10 [DFB]
 779 DragonFly 5.2.1         2018-05-20 [DFB]
 780 DragonFly 5.2.2         2018-06-18 [DFB]
 781 FreeBSD 11.2            2018-06-27 [FBD]
 782 NetBSD 8.0              2018-07-17 [NBD]
 783 NetBSD 7.2              2018-08-29 [NBD]
 784 macOS 10.14             2018-09-24 [APL]
 785 OpenBSD 6.4             2018-10-18 [OBD]
 786 DragonFly 5.4.0         2018-12-03 [DFB]
 787 FreeBSD 12.0            2018-12-11 [FBD]
 788 DragonFly 5.4.1         2018-12-24 [DFB]
 789 OpenBSD 6.5             2019-05-01 [OBD]
 790 NetBSD 8.1              2019-06-04 [NBD]
 791 DragonFly 5.6           2019-06-17 [DFB]
 792 DragonFly 5.6.1         2019-06-19 [DFB]
 793 OpenBSD 6.6             2019-10-17 [OBD]
 794 FreeBSD 12.1            2019-11-04 [FBD]
 795
 796 Bibliography
 797 ------------------------
 798
 799 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
 800 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
 801 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
 802
 803 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
 804 Company, Inc., 1994. ISBN 0-201-54777-5
 805
 806 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
 807 Quarterman. The Design and Implementation of the 4.4BSD Operating
 808 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
 809
 810 McKusick, Marshall Kirk, George Neville-Neil. The Design and
 811 Implementation of the FreeBSD Operating System.
 812 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
 813
 814 McKusick, Marshall Kirk, George Neville-Neil, Robert Watson. The
 815 Design and Implementation of the FreeBSD Operating System, 2nd Edition.
 816 Pearson Education, Inc., 2014. ISBN 0-321-96897-2
 817
 818 Doug McIlroy. Research Unix Reader.
 819
 820 Michael G. Brown. The Role of BSD in the Development of Unix.
 821 Presented to the Tasmanian Unix Special Interest Group of the
 822 Australian Computer Society, Hobart, August 1993.
 823
 824 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
 825 URL: http://www.byte.com/art/9410/sec8/art3.htm
 826
 827 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
 828 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
 829
 830 BSD Release Announcements collection.
 831 URL: https://www.FreeBSD.org/releases/
 832
 833 BSD Hypertext Man Pages
 834 URL: https://www.FreeBSD.org/cgi/man.cgi
 835
 836 UNIX history graphing project
 837 URL: http://minnie.tuhs.org/Unix_History/index.html
 838
 839 UNIX history
 840 URL: http://www.levenez.com/unix/
 841
 842 James Howard: The BSD Family Tree
 843 URL: http://ezine.daemonnews.org/200104/bsd_family.html
 844 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
 845
 846
 847 Acknowledgments
 848 ---------------
 849
 850 Josh Gilliam for suggestions, bug fixes, and finding very old
 851 original BSD announcements from Usenet or tapes.
 852
 853 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
 854
 855 --
 856 Copyright (c) 1997-2012 Wolfram Schneider <wosch@FreeBSD.ORG>
 857 URL: https://svnweb.freebsd.org/base/head/share/misc/bsd-family-tree
 858
 859 $FreeBSD$