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  |                    |      |                    |                    |
 404 FreeBSD 13 -current   |  NetBSD -current   OpenBSD -current   DragonFly -current
 405  |                    |      |                    |                    |
 406  v                    v      v                    v                    v
 407
 408 Time
 409 ----------------
 410
 411 Time tolerance +/- 6 months, depending on which book/article you read; if it
 412 was the announcement in Usenet or if it was available as tape.
 413
 414 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
 415         and John Quarterman. The Design and Implementation of
 416         the 4.4BSD Operating System.
 417 [APL] Apple website [https://www.apple.com/macosx/]
 418 [BSDI] Berkeley Software Design, Inc.
 419 [DFB] DragonFlyBSD Project, The.
 420 [DOC] README, COPYRIGHT on tape.
 421 [FBD] FreeBSD Project, The.
 422 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
 423         Volume 11, Info 4, April, 1987.
 424 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
 425         comp.bugs.4bsd.ucb-fixes, June 15, 1988.
 426 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
 427         Changes in the Kernel in 2.9BSD. Second Berkeley Software
 428         Distribution UNIX Version 2.9, July, 1983.
 429 [NBD] NetBSD Project, The.
 430 [OBD] OpenBSD Project, The.
 431 [QCU] Salus, Peter H. A quarter century of UNIX.
 432 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
 433 [TUHS] The Unix Historical Society.  http://minnie.tuhs.org/Unix_History/.
 434 [USE] Usenet announcement.
 435 [WRS] Wind River Systems, Inc.
 436 [dmr] Dennis Ritchie, via E-Mail
 437
 438 Multics                 1965
 439 UNIX                    Summer 1969
 440                                 DEC PDP-7
 441 First   Edition         1971-11-03 [QCU]
 442                                 DEC PDP-11/20, Assembler
 443 Second  Edition         1972-06-12 [QCU]
 444                                 10 UNIX installations
 445 Third   Edition         1973-02-xx [QCU]
 446                                 Pipes, 16 installations
 447 Fourth  Edition         1973-11-xx [QCU]
 448                                 rewriting in C effected,
 449                                 above 30 installations
 450 Fifth   Edition         1974-06-xx [QCU]
 451                                 above 50 installations
 452 Sixth   Edition         1975-05-xx [QCU]
 453                                 port to DEC Vax
 454 Seventh Edition         1979-01-xx [QCU] 1979-01-10 [TUHS]
 455                                 first portable UNIX
 456 Eighth  Edition         1985-02-xx [QCU]
 457                                 VAX 11/750, VAX 11/780 [dmr]
 458                                 descended from 4.1c BSD [dmr]
 459                                 descended from 4.1 BSD [44B]
 460                         scooping-out and replacement of the character-device
 461                         and networking part by the streams mechanism
 462
 463 Ninth   Edition         1986-09-xx [QCU]
 464 Tenth   Edition         1989-10-xx [QCU]
 465
 466 1BSD                    late 1977
 467                         1978-03-09 [QCU]
 468                                 PDP-11, Pascal, ex(1)
 469                                 30 free copies of 1BSD sent out
 470                                 35 tapes sold for 50 USD [QCU]
 471 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
 472                                 75 2BSD tapes shipped
 473 2.79BSD                 1980-04-xx [TUHS]
 474 2.8BSD                  1981-07-xx [KSJ]
 475
 476 2.8.1BSD                1982-01-xx [QCU]
 477                                 set of performance improvements
 478 2.9BSD                  1983-07-xx [KSJ]
 479 2.9.1BSD                1983-11-xx [TUHS]
 480 2.9BSD-Seismo           1985-08-xx [SMS]
 481 2.10BSD                 1987-04-xx [KKK]
 482 2.10.1BSD               1989-01-xx [SMS]
 483 2.11BSD                 1992-02-xx [SMS]
 484 2.11BSD rev #430        1999-12-13 [SMS]
 485
 486 32V                     1978-1[01]-xx [QCU] 1979-03-26 [TUHS]
 487 3BSD                    late 1979 [QCU] March 1980 [TUHS]
 488                                 virtual memory, page replacement,
 489                                 demand paging
 490 4.0BSD                  1980-10-xx
 491 4.1BSD                  1981-07-08 [DOC]
 492 4.1aBSD                 1982-04-xx
 493                                 alpha release, 100 sites, networking [44B]
 494 4.1bBSD                         internal release, fast filesystem [44B]
 495 4.1cBSD                 late 1982
 496                                 beta release, IPC [44B]
 497 4.2BSD                  1983-09-xx [QCU]
 498                         1983-08-03 [DOC]
 499 4.3BSD                  1986-06-xx [QCU]
 500                         1986-04-05 [KB], [DOC]
 501 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
 502 4.3BSD NET/1            1988-11-xx [QCU]
 503                         1989-01-01 [DOC]
 504 4.3BSD Reno             1990-06-29 [QCU], [DOC]
 505 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
 506
 507 BSD/386 ALPHA           1991-12-xx [BSDI]
 508                                 first code released to people outside BSDI
 509 386BSD 0.0              1992-02-xx [DOC]
 510 BSD/386 0.3.1           1992-04-xx [BSDI] first ext. beta; B customers
 511 BSD/386 0.3.3           1992-06-xx [BSDI] first CDROM version
 512 386BSD 0.1              1992-07-28 [DOC]
 513 4.4BSD Alpha            1992-07-07
 514 BSD/386 0.9.3           1992-10-xx [BSDI]
 515                                 first external gamma; G customers
 516 BSD/386 0.9.4           1992-12-xx [BSDI]
 517                                 would have been 1.0 except for request
 518                                 for preliminary injunction
 519 BSD/386 1.0             1993-03-xx [BSDI]
 520                                 injunction denied; first official release
 521 NetBSD 0.8              1993-04-20 [NBD]
 522 4.4BSD                  1993-06-01 [USE]
 523 NetBSD 0.9              1993-08-23 [NBD]
 524 FreeBSD 1.0             1993-11-01 [FBD]
 525 FreeBSD 1.0.2           1993-11-14 [FBD]
 526                                 supersedes 1.0 13 days after release.
 527 BSD/386 1.1             1994-02-xx [BSDI]
 528 4.4BSD Lite             1994-03-01 [USE]
 529 FreeBSD 1.1             1994-05-07 [FBD]
 530 FreeBSD 1.1.5           1994-06-30 [FBD]
 531 FreeBSD 1.1.5.1         1994-07-05 [FBD]
 532                                 supersedes 1.1.5 5 days after release.
 533 NetBSD 1.0              1994-10-26 [NBD]
 534 386BSD 1.0              1994-11-12 [USE]
 535 FreeBSD 2.0             1994-11-23 [FBD]
 536 BSD/OS 2.0              1995-01-xx [BSDI] 4.4 lite based
 537 FreeBSD 2.0.5           1995-06-10 [FBD]
 538 BSD/OS 2.0.1            1995-06-xx [BSDI]
 539 4.4BSD Lite Release 2   1995-06-xx [44B]
 540                                 the true final distribution from the CSRG
 541 FreeBSD 2.1.0           1995-11-19 [FBD]
 542 NetBSD 1.1              1995-11-26 [NBD]
 543 BSD/OS 2.1              1996-01-xx [BSDI]
 544 FreeBSD 2.1.5           1996-07-14 [FBD]
 545 NetBSD 1.2              1996-10-04 [NBD]
 546 OpenBSD 2.0             1996-10-18 [OBD]
 547 FreeBSD 2.1.6           1996-11-16 [FBD]
 548 FreeBSD 2.1.6.1         1996-11-25 [FBD] (sendmail security release)
 549 Rhapsody                1997-xx-xx
 550 FreeBSD 2.1.7           1997-02-20 [FBD]
 551 BSD/OS 3.0              1997-02-xx [BSDI] 4.4 lite2 based
 552 FreeBSD 2.2.0           1997-03-16 [FBD]
 553 FreeBSD 2.2.1           1997-03-25 [FBD]
 554 FreeBSD 2.2.2           1997-05-16 [FBD]
 555 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
 556 OpenBSD 2.1             1997-06-01 [OBD]
 557 FreeBSD 2.2.5           1997-10-22 [FBD]
 558 OpenBSD 2.2             1997-12-01 [OBD]
 559 NetBSD 1.3              1998-01-04 [NBD]
 560 FreeBSD 2.2.6           1998-03-25 [FBD]
 561 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
 562 BSD/OS 3.1              1998-03-xx [BSDI]
 563 OpenBSD 2.3             1998-05-19 [OBD]
 564 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
 565 FreeBSD 2.2.7           1998-07-22 [FBD]
 566 BSD/OS 4.0              1998-08-xx [BSDI]
 567                                 2-lock MP support, ELF executables
 568 FreeBSD 3.0             1998-10-16 [FBD]
 569                                 FreeBSD-3.0 is a snapshot from -current,
 570                                 while 3.1 and 3.2 are from 3.x-stable which
 571                                 was branched quite some time after 3.0-release
 572 FreeBSD 2.2.8           1998-11-29 [FBD]
 573 OpenBSD 2.4             1998-12-01 [OBD]
 574 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
 575 FreeBSD 3.1             1999-02-15 [FBD]
 576 BSD/OS 4.0.1            1999-03-xx [BSDI]
 577 NetBSD 1.4              1999-05-12 [NBD]
 578 FreeBSD 3.2             1999-05-17 [FBD]
 579 OpenBSD 2.5             1999-05-19 [OBD]
 580 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
 581 FreeBSD 3.3             1999-09-17 [FBD]
 582 OpenBSD 2.6             1999-12-01 [OBD]
 583 FreeBSD 3.4             1999-12-20 [FBD]
 584 BSD/OS 4.1              1999-12-xx [BSDI]
 585 FreeBSD 4.0             2000-03-13 [FBD]
 586 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
 587 OpenBSD 2.7             2000-06-15 [OBD]
 588 FreeBSD 3.5             2000-06-24 [FBD]
 589 FreeBSD 4.1             2000-07-27 [FBD]
 590 FreeBSD 3.5.1           2000-07-28 [FBD]
 591 FreeBSD 4.1.1           2000-09-25 [FBD] (a network-only patch release)
 592 FreeBSD 4.2             2000-11-21 [FBD]
 593 NetBSD 1.4.3            2000-11-25 [NBD] (patch release)
 594 BSD/OS 4.2              2000-11-29 [BSDI]
 595 OpenBSD 2.8             2000-12-01 [OBD]
 596 NetBSD 1.5              2000-12-06 [NBD]
 597 Mac OS X 10.0           2001-03-24 [APL]
 598 FreeBSD 4.3             2001-04-20 [FBD]
 599 OpenBSD 2.9             2001-06-01 [OBD]
 600 NetBSD 1.5.1            2001-07-11 [NBD] (patch release)
 601 NetBSD 1.5.2            2001-09-13 [NBD] (patch release)
 602 FreeBSD 4.4             2001-09-18 [FBD]
 603 Mac OS X 10.1           2001-09-29 [APL]
 604 OpenBSD 3.0             2001-12-01 [OBD]
 605 FreeBSD 4.5             2002-01-29 [FBD]
 606 BSD/OS 4.3              2002-03-14 [WRS]
 607 OpenBSD 3.1             2002-05-19 [OBD]
 608 FreeBSD 4.6             2002-06-15 [FBD]
 609 NetBSD 1.5.3            2002-07-22 [NBD] (patch release)
 610 FreeBSD 4.6.2           2002-08-15 [FBD] (patch release)
 611 Mac OS X 10.2           2002-08-23 [APL]
 612 NetBSD 1.6              2002-09-14 [NBD]
 613 FreeBSD 4.7             2002-10-08 [FBD]
 614 OpenBSD 3.2             2002-11-01 [OBD]
 615 FreeBSD 5.0             2003-01-17 [FBD]
 616                                 FreeBSD 5.0 is a separate branch off of
 617                                 -current, similar to 3.0.
 618 FreeBSD 4.8             2003-04-03 [FBD]
 619 NetBSD 1.6.1            2003-04-21 [NBD] (patch release)
 620 OpenBSD 3.3             2003-05-01 [OBD]
 621 BSD/OS 5.0              2003-05-?? [WRS]
 622 FreeBSD 5.1             2003-06-09 [FBD]
 623 Mac OS X 10.3           2003-10-24 [APL]
 624 FreeBSD 4.9             2003-10-28 [FBD]
 625 BSD/OS 5.1 ISE          2003-10-?? [WRS] (final version)
 626 OpenBSD 3.4             2003-11-01 [OBD]
 627 FreeBSD 5.2             2004-01-12 [FBD]
 628 FreeBSD 5.2.1           2004-02-22 [FBD] (patch release)
 629 NetBSD 1.6.2            2004-03-01 [NBD] (patch release)
 630 OpenBSD 3.5             2004-04-01 [OBD]
 631 FreeBSD 4.10            2004-05-27 [FBD]
 632 DragonFly 1.0           2004-07-12 [DFB]
 633 OpenBSD 3.6             2004-10-29 [OBD]
 634 FreeBSD 5.3             2004-11-06 [FBD]
 635 NetBSD 2.0              2004-12-09 [NBD]
 636 FreeBSD 4.11            2005-01-25 [FBD]
 637 DragonFly 1.2.0         2005-04-08 [DFB]
 638 NetBSD 2.0.2            2005-04-14 [NBD] (security/critical release)
 639 Mac OS X 10.4           2005-04-29 [APL]
 640 FreeBSD 5.4             2005-05-09 [FBD]
 641 OpenBSD 3.7             2005-05-19 [OBD]
 642 NetBSD 2.0.3            2005-10-31 [NBD] (security/critical release)
 643 OpenBSD 3.8             2005-11-01 [OBD]
 644 FreeBSD 6.0             2005-11-01 [FBD]
 645 NetBSD 2.1              2005-11-02 [NBD]
 646 NetBSD 3.0              2005-12-23 [NBD]
 647 DragonFly 1.4.0         2006-01-08 [DFB]
 648 FreeBSD 2.2.9           2006-04-01 [FBD]
 649 OpenBSD 3.9             2006-05-01 [OBD]
 650 FreeBSD 6.1             2006-05-08 [FBD]
 651 FreeBSD 5.5             2006-05-25 [FBD]
 652 NetBSD 3.0.1            2006-07-24 [NBD] (security/critical release)
 653 DragonFly 1.6.0         2006-07-24 [DFB]
 654 OpenBSD 4.0             2006-11-01 [OBD]
 655 NetBSD 3.0.2            2006-11-04 [NBD] (security/critical release)
 656 NetBSD 3.1              2006-11-04 [NBD]
 657 FreeBSD 6.2             2007-01-15 [FBD]
 658 DragonFly 1.8.0         2007-01-30 [DFB]
 659 OpenBSD 4.1             2007-05-01 [OBD]
 660 DragonFly 1.10.0        2007-08-06 [DFB]
 661 Mac OS X 10.5           2007-10-26 [APL]
 662 OpenBSD 4.2             2007-11-01 [OBD]
 663 NetBSD 4.0              2007-12-19 [NBD]
 664 FreeBSD 6.3             2008-01-18 [FBD]
 665 DragonFly 1.12.0        2008-02-26 [DFB]
 666 FreeBSD 7.0             2008-02-27 [FBD]
 667 OpenBSD 4.3             2008-05-01 [OBD]
 668 DragonFly 2.0.0         2008-07-21 [DFB]
 669 OpenBSD 4.4             2008-11-01 [OBD]
 670 FreeBSD 6.4             2008-11-28 [FBD]
 671 FreeBSD 7.1             2009-01-04 [FBD]
 672 DragonFly 2.2.0         2009-02-17 [DFB]
 673 NetBSD 5.0              2009-04-29 [NBD]
 674 OpenBSD 4.5             2009-05-01 [OBD]
 675 FreeBSD 7.2             2009-05-04 [FBD]
 676 Mac OS X 10.6           2009-06-08 [APL]
 677 NetBSD 5.0.1            2009-08-02 [NBD] (security/critical release)
 678 DragonFly 2.4.0         2009-09-16 [DFB]
 679 OpenBSD 4.6             2009-10-18 [OBD]
 680 FreeBSD 8.0             2009-11-26 [FBD]
 681 NetBSD 5.0.2            2010-02-12 [NBD] (security/critical release)
 682 FreeBSD 7.3             2010-03-23 [FBD]
 683 DragonFly 2.6.0         2010-03-28 [DFB]
 684 OpenBSD 4.7             2010-05-19 [OBD]
 685 FreeBSD 8.1             2010-07-24 [FBD]
 686 DragonFly 2.8.2         2010-10-30 [DFB]
 687 OpenBSD 4.8             2010-11-01 [OBD]
 688 NetBSD 5.1              2010-11-19 [NBD]
 689 FreeBSD 7.4             2011-02-24 [FBD]
 690 FreeBSD 8.2             2011-02-24 [FBD]
 691 DragonFly 2.10.1        2011-04-26 [DFB]
 692 OpenBSD 4.9             2011-05-01 [OBD]
 693 Mac OS X 10.7           2011-07-20 [APL]
 694 OpenBSD 5.0             2011-11-01 [OBD]
 695 FreeBSD 9.0             2012-01-12 [FBD]
 696 NetBSD 5.1.2            2012-02-02 [NBD] (security/critical release)
 697 DragonFly 3.0.1         2012-02-21 [DFB]
 698 FreeBSD 8.3             2012-04-18 [FBD]
 699 OpenBSD 5.1             2012-05-01 [OBD]
 700 Mac OS X 10.8           2012-07-25 [APL]
 701 NetBSD 6.0              2012-10-17 [NBD]
 702 OpenBSD 5.2             2012-11-01 [OBD]
 703 DragonFly 3.2.1         2012-11-02 [DFB]
 704 NetBSD 5.2              2012-12-03 [NBD]
 705 NetBSD 6.0.1            2012-12-26 [NBD] (security/critical release)
 706 FreeBSD 9.1             2012-12-30 [FBD]
 707 DragonFly 3.4.1         2013-04-29 [DFB]
 708 OpenBSD 5.3             2013-05-01 [OBD]
 709 NetBSD 6.0.2            2013-05-18 [NBD] (security/critical release)
 710 NetBSD 6.1              2013-05-18 [NBD]
 711 FreeBSD 8.4             2013-06-07 [FBD]
 712 NetBSD 6.1.1            2013-08-22 [NBD]
 713 NetBSD 5.1.3            2013-09-29 [NBD]
 714 NetBSD 5.2.1            2013-09-29 [NBD]
 715 FreeBSD 9.2             2013-09-30 [FBD]
 716 NetBSD 6.0.3            2013-09-30 [NBD]
 717 NetBSD 6.1.2            2013-09-30 [NBD]
 718 Mac OS X 10.9           2013-10-22 [APL]
 719 OpenBSD 5.4             2013-11-01 [OBD]
 720 DragonFly 3.6.0         2013-11-25 [DFB]
 721 FreeBSD 10.0            2014-01-20 [FBD]
 722 NetBSD 5.1.4            2014-01-25 [NBD]
 723 NetBSD 5.2.2            2014-01-25 [NBD]
 724 NetBSD 6.0.4            2014-01-25 [NBD]
 725 NetBSD 6.1.3            2014-01-25 [NBD]
 726 DragonFly 3.6.1         2014-02-22 [DFB]
 727 DragonFly 3.6.2         2014-04-10 [DFB]
 728 NetBSD 6.0.5            2014-04-12 [NBD]
 729 NetBSD 6.1.4            2014-04-12 [NBD]
 730 OpenBSD 5.5             2014-05-01 [OBD]
 731 DragonFly 3.8.0         2014-06-04 [DFB]
 732 DragonFly 3.8.1         2014-06-16 [DFB]
 733 DragonFly 3.6.3         2014-06-17 [DFB]
 734 FreeBSD 9.3             2014-07-05 [FBD]
 735 DragonFly 3.8.2         2014-08-08 [DFB]
 736 NetBSD 6.0.6            2014-09-22 [NBD]
 737 NetBSD 6.1.5            2014-09-22 [NBD]
 738 Mac OS X 10.10          2014-10-16 [APL]
 739 OpenBSD 5.6             2014-11-01 [OBD]
 740 FreeBSD 10.1            2014-11-14 [FBD]
 741 DragonFly 4.0.1         2014-11-25 [DFB]
 742 DragonFly 4.0.2         2015-01-07 [DFB]
 743 DragonFly 4.0.3         2015-01-21 [DFB]
 744 DragonFly 4.0.4         2015-03-09 [DFB]
 745 DragonFly 4.0.5         2015-03-23 [DFB]
 746 OpenBSD 5.7             2015-05-01 [OBD]
 747 DragonFly 4.2.0         2015-06-29 [DFB]
 748 FreeBSD 10.2            2015-08-13 [FBD]
 749 NetBSD 7.0              2015-09-25 [NBD]
 750 OS X 10.11              2015-09-30 [APL]
 751 OpenBSD 5.8             2015-10-18 [OBD]
 752 DragonFly 4.4.1         2015-12-07 [DFB]
 753 OpenBSD 5.9             2016-03-29 [OBD]
 754 FreeBSD 10.3            2016-04-04 [FBD]
 755 NetBSD 7.0.1            2016-05-22 [NBD]
 756 DragonFly 4.6.0         2016-08-02 [DFB]
 757 OpenBSD 6.0             2016-09-01 [OBD]
 758 macOS 10.12             2016-09-20 [APL]
 759 FreeBSD 11.0            2016-10-10 [FBD]
 760 NetBSD 7.0.2            2016-10-21 [NBD]
 761 NetBSD 7.1              2017-03-11 [NBD]
 762 DragonFly 4.8.0         2017-03-27 [DFB]
 763 OpenBSD 6.1             2017-04-11 [OBD]
 764 FreeBSD 11.1            2017-07-26 [FBD]
 765 macOS 10.13             2017-09-25 [APL]
 766 FreeBSD 10.4            2017-10-03 [FBD]
 767 OpenBSD 6.2             2017-10-09 [OBD]
 768 DragonFly 5.0.0         2017-10-16 [DFB]
 769 DragonFly 5.0.1         2017-11-06 [DFB]
 770 DragonFly 5.0.2         2017-12-04 [DFB]
 771 NetBSD 7.1.1            2017-12-22 [NBD]
 772 NetBSD 7.1.2            2018-03-15 [NBD]
 773 OpenBSD 6.3             2018-04-02 [OBD]
 774 DragonFly 5.2.0         2018-04-10 [DFB]
 775 DragonFly 5.2.1         2018-05-20 [DFB]
 776 DragonFly 5.2.2         2018-06-18 [DFB]
 777 FreeBSD 11.2            2018-06-27 [FBD]
 778 NetBSD 8.0              2018-07-17 [NBD]
 779 NetBSD 7.2              2018-08-29 [NBD]
 780 macOS 10.14             2018-09-24 [APL]
 781 OpenBSD 6.4             2018-10-18 [OBD]
 782 DragonFly 5.4.0         2018-12-03 [DFB]
 783 FreeBSD 12.0            2018-12-11 [FBD]
 784 DragonFly 5.4.1         2018-12-24 [DFB]
 785 OpenBSD 6.5             2019-05-01 [OBD]
 786 NetBSD 8.1              2019-06-04 [NBD]
 787 DragonFly 5.6           2019-06-17 [DFB]
 788 DragonFly 5.6.1         2019-06-19 [DFB]
 789
 790 Bibliography
 791 ------------------------
 792
 793 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
 794 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
 795 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
 796
 797 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
 798 Company, Inc., 1994. ISBN 0-201-54777-5
 799
 800 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
 801 Quarterman. The Design and Implementation of the 4.4BSD Operating
 802 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
 803
 804 McKusick, Marshall Kirk, George Neville-Neil. The Design and
 805 Implementation of the FreeBSD Operating System.
 806 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
 807
 808 McKusick, Marshall Kirk, George Neville-Neil, Robert Watson. The
 809 Design and Implementation of the FreeBSD Operating System, 2nd Edition.
 810 Pearson Education, Inc., 2014. ISBN 0-321-96897-2
 811
 812 Doug McIlroy. Research Unix Reader.
 813
 814 Michael G. Brown. The Role of BSD in the Development of Unix.
 815 Presented to the Tasmanian Unix Special Interest Group of the
 816 Australian Computer Society, Hobart, August 1993.
 817
 818 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
 819 URL: http://www.byte.com/art/9410/sec8/art3.htm
 820
 821 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
 822 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
 823
 824 BSD Release Announcements collection.
 825 URL: https://www.FreeBSD.org/releases/
 826
 827 BSD Hypertext Man Pages
 828 URL: https://www.FreeBSD.org/cgi/man.cgi
 829
 830 UNIX history graphing project
 831 URL: http://minnie.tuhs.org/Unix_History/index.html
 832
 833 UNIX history
 834 URL: http://www.levenez.com/unix/
 835
 836 James Howard: The BSD Family Tree
 837 URL: http://ezine.daemonnews.org/200104/bsd_family.html
 838 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
 839
 840
 841 Acknowledgments
 842 ---------------
 843
 844 Josh Gilliam for suggestions, bug fixes, and finding very old
 845 original BSD announcements from Usenet or tapes.
 846
 847 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
 848
 849 --
 850 Copyright (c) 1997-2012 Wolfram Schneider <wosch@FreeBSD.ORG>
 851 URL: https://svnweb.freebsd.org/base/head/share/misc/bsd-family-tree
 852
 853 $FreeBSD$