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    |      |                    |                    |
 404  |     |     11.3     |      |                    |                    |
 405  |  FreeBSD           |      |                OpenBSD 6.6              |
 406  |   12.1             |      |                    |                    |
 407  |     |              |      |                    |                    |
 408  |     v              |      |                    |                    |
 409  |                    |      |                    |                    |
 410 FreeBSD 13 -current   |  NetBSD -current   OpenBSD -current   DragonFly -current
 411  |                    |      |                    |                    |
 412  v                    v      v                    v                    v
 413
 414 Time
 415 ----------------
 416
 417 Time tolerance +/- 6 months, depending on which book/article you read; if it
 418 was the announcement in Usenet or if it was available as tape.
 419
 420 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
 421         and John Quarterman. The Design and Implementation of
 422         the 4.4BSD Operating System.
 423 [APL] Apple website [https://www.apple.com/macosx/]
 424 [BSDI] Berkeley Software Design, Inc.
 425 [DFB] DragonFlyBSD Project, The.
 426 [DOC] README, COPYRIGHT on tape.
 427 [FBD] FreeBSD Project, The.
 428 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
 429         Volume 11, Info 4, April, 1987.
 430 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
 431         comp.bugs.4bsd.ucb-fixes, June 15, 1988.
 432 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
 433         Changes in the Kernel in 2.9BSD. Second Berkeley Software
 434         Distribution UNIX Version 2.9, July, 1983.
 435 [NBD] NetBSD Project, The.
 436 [OBD] OpenBSD Project, The.
 437 [QCU] Salus, Peter H. A quarter century of UNIX.
 438 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
 439 [TUHS] The Unix Historical Society.  http://minnie.tuhs.org/Unix_History/.
 440 [USE] Usenet announcement.
 441 [WRS] Wind River Systems, Inc.
 442 [dmr] Dennis Ritchie, via E-Mail
 443
 444 Multics                 1965
 445 UNIX                    Summer 1969
 446                                 DEC PDP-7
 447 First   Edition         1971-11-03 [QCU]
 448                                 DEC PDP-11/20, Assembler
 449 Second  Edition         1972-06-12 [QCU]
 450                                 10 UNIX installations
 451 Third   Edition         1973-02-xx [QCU]
 452                                 Pipes, 16 installations
 453 Fourth  Edition         1973-11-xx [QCU]
 454                                 rewriting in C effected,
 455                                 above 30 installations
 456 Fifth   Edition         1974-06-xx [QCU]
 457                                 above 50 installations
 458 Sixth   Edition         1975-05-xx [QCU]
 459                                 port to DEC Vax
 460 Seventh Edition         1979-01-xx [QCU] 1979-01-10 [TUHS]
 461                                 first portable UNIX
 462 Eighth  Edition         1985-02-xx [QCU]
 463                                 VAX 11/750, VAX 11/780 [dmr]
 464                                 descended from 4.1c BSD [dmr]
 465                                 descended from 4.1 BSD [44B]
 466                         scooping-out and replacement of the character-device
 467                         and networking part by the streams mechanism
 468
 469 Ninth   Edition         1986-09-xx [QCU]
 470 Tenth   Edition         1989-10-xx [QCU]
 471
 472 1BSD                    late 1977
 473                         1978-03-09 [QCU]
 474                                 PDP-11, Pascal, ex(1)
 475                                 30 free copies of 1BSD sent out
 476                                 35 tapes sold for 50 USD [QCU]
 477 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
 478                                 75 2BSD tapes shipped
 479 2.79BSD                 1980-04-xx [TUHS]
 480 2.8BSD                  1981-07-xx [KSJ]
 481
 482 2.8.1BSD                1982-01-xx [QCU]
 483                                 set of performance improvements
 484 2.9BSD                  1983-07-xx [KSJ]
 485 2.9.1BSD                1983-11-xx [TUHS]
 486 2.9BSD-Seismo           1985-08-xx [SMS]
 487 2.10BSD                 1987-04-xx [KKK]
 488 2.10.1BSD               1989-01-xx [SMS]
 489 2.11BSD                 1992-02-xx [SMS]
 490 2.11BSD rev #430        1999-12-13 [SMS]
 491
 492 32V                     1978-1[01]-xx [QCU] 1979-03-26 [TUHS]
 493 3BSD                    late 1979 [QCU] March 1980 [TUHS]
 494                                 virtual memory, page replacement,
 495                                 demand paging
 496 4.0BSD                  1980-10-xx
 497 4.1BSD                  1981-07-08 [DOC]
 498 4.1aBSD                 1982-04-xx
 499                                 alpha release, 100 sites, networking [44B]
 500 4.1bBSD                         internal release, fast filesystem [44B]
 501 4.1cBSD                 late 1982
 502                                 beta release, IPC [44B]
 503 4.2BSD                  1983-09-xx [QCU]
 504                         1983-08-03 [DOC]
 505 4.3BSD                  1986-06-xx [QCU]
 506                         1986-04-05 [KB], [DOC]
 507 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
 508 4.3BSD NET/1            1988-11-xx [QCU]
 509                         1989-01-01 [DOC]
 510 4.3BSD Reno             1990-06-29 [QCU], [DOC]
 511 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
 512
 513 BSD/386 ALPHA           1991-12-xx [BSDI]
 514                                 first code released to people outside BSDI
 515 386BSD 0.0              1992-02-xx [DOC]
 516 BSD/386 0.3.1           1992-04-xx [BSDI] first ext. beta; B customers
 517 BSD/386 0.3.3           1992-06-xx [BSDI] first CDROM version
 518 386BSD 0.1              1992-07-28 [DOC]
 519 4.4BSD Alpha            1992-07-07
 520 BSD/386 0.9.3           1992-10-xx [BSDI]
 521                                 first external gamma; G customers
 522 BSD/386 0.9.4           1992-12-xx [BSDI]
 523                                 would have been 1.0 except for request
 524                                 for preliminary injunction
 525 BSD/386 1.0             1993-03-xx [BSDI]
 526                                 injunction denied; first official release
 527 NetBSD 0.8              1993-04-20 [NBD]
 528 4.4BSD                  1993-06-01 [USE]
 529 NetBSD 0.9              1993-08-23 [NBD]
 530 FreeBSD 1.0             1993-11-01 [FBD]
 531 FreeBSD 1.0.2           1993-11-14 [FBD]
 532                                 supersedes 1.0 13 days after release.
 533 BSD/386 1.1             1994-02-xx [BSDI]
 534 4.4BSD Lite             1994-03-01 [USE]
 535 FreeBSD 1.1             1994-05-07 [FBD]
 536 FreeBSD 1.1.5           1994-06-30 [FBD]
 537 FreeBSD 1.1.5.1         1994-07-05 [FBD]
 538                                 supersedes 1.1.5 5 days after release.
 539 NetBSD 1.0              1994-10-26 [NBD]
 540 386BSD 1.0              1994-11-12 [USE]
 541 FreeBSD 2.0             1994-11-23 [FBD]
 542 BSD/OS 2.0              1995-01-xx [BSDI] 4.4 lite based
 543 FreeBSD 2.0.5           1995-06-10 [FBD]
 544 BSD/OS 2.0.1            1995-06-xx [BSDI]
 545 4.4BSD Lite Release 2   1995-06-xx [44B]
 546                                 the true final distribution from the CSRG
 547 FreeBSD 2.1.0           1995-11-19 [FBD]
 548 NetBSD 1.1              1995-11-26 [NBD]
 549 BSD/OS 2.1              1996-01-xx [BSDI]
 550 FreeBSD 2.1.5           1996-07-14 [FBD]
 551 NetBSD 1.2              1996-10-04 [NBD]
 552 OpenBSD 2.0             1996-10-18 [OBD]
 553 FreeBSD 2.1.6           1996-11-16 [FBD]
 554 FreeBSD 2.1.6.1         1996-11-25 [FBD] (sendmail security release)
 555 Rhapsody                1997-xx-xx
 556 FreeBSD 2.1.7           1997-02-20 [FBD]
 557 BSD/OS 3.0              1997-02-xx [BSDI] 4.4 lite2 based
 558 FreeBSD 2.2.0           1997-03-16 [FBD]
 559 FreeBSD 2.2.1           1997-03-25 [FBD]
 560 FreeBSD 2.2.2           1997-05-16 [FBD]
 561 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
 562 OpenBSD 2.1             1997-06-01 [OBD]
 563 FreeBSD 2.2.5           1997-10-22 [FBD]
 564 OpenBSD 2.2             1997-12-01 [OBD]
 565 NetBSD 1.3              1998-01-04 [NBD]
 566 FreeBSD 2.2.6           1998-03-25 [FBD]
 567 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
 568 BSD/OS 3.1              1998-03-xx [BSDI]
 569 OpenBSD 2.3             1998-05-19 [OBD]
 570 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
 571 FreeBSD 2.2.7           1998-07-22 [FBD]
 572 BSD/OS 4.0              1998-08-xx [BSDI]
 573                                 2-lock MP support, ELF executables
 574 FreeBSD 3.0             1998-10-16 [FBD]
 575                                 FreeBSD-3.0 is a snapshot from -current,
 576                                 while 3.1 and 3.2 are from 3.x-stable which
 577                                 was branched quite some time after 3.0-release
 578 FreeBSD 2.2.8           1998-11-29 [FBD]
 579 OpenBSD 2.4             1998-12-01 [OBD]
 580 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
 581 FreeBSD 3.1             1999-02-15 [FBD]
 582 BSD/OS 4.0.1            1999-03-xx [BSDI]
 583 NetBSD 1.4              1999-05-12 [NBD]
 584 FreeBSD 3.2             1999-05-17 [FBD]
 585 OpenBSD 2.5             1999-05-19 [OBD]
 586 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
 587 FreeBSD 3.3             1999-09-17 [FBD]
 588 OpenBSD 2.6             1999-12-01 [OBD]
 589 FreeBSD 3.4             1999-12-20 [FBD]
 590 BSD/OS 4.1              1999-12-xx [BSDI]
 591 FreeBSD 4.0             2000-03-13 [FBD]
 592 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
 593 OpenBSD 2.7             2000-06-15 [OBD]
 594 FreeBSD 3.5             2000-06-24 [FBD]
 595 FreeBSD 4.1             2000-07-27 [FBD]
 596 FreeBSD 3.5.1           2000-07-28 [FBD]
 597 FreeBSD 4.1.1           2000-09-25 [FBD] (a network-only patch release)
 598 FreeBSD 4.2             2000-11-21 [FBD]
 599 NetBSD 1.4.3            2000-11-25 [NBD] (patch release)
 600 BSD/OS 4.2              2000-11-29 [BSDI]
 601 OpenBSD 2.8             2000-12-01 [OBD]
 602 NetBSD 1.5              2000-12-06 [NBD]
 603 Mac OS X 10.0           2001-03-24 [APL]
 604 FreeBSD 4.3             2001-04-20 [FBD]
 605 OpenBSD 2.9             2001-06-01 [OBD]
 606 NetBSD 1.5.1            2001-07-11 [NBD] (patch release)
 607 NetBSD 1.5.2            2001-09-13 [NBD] (patch release)
 608 FreeBSD 4.4             2001-09-18 [FBD]
 609 Mac OS X 10.1           2001-09-29 [APL]
 610 OpenBSD 3.0             2001-12-01 [OBD]
 611 FreeBSD 4.5             2002-01-29 [FBD]
 612 BSD/OS 4.3              2002-03-14 [WRS]
 613 OpenBSD 3.1             2002-05-19 [OBD]
 614 FreeBSD 4.6             2002-06-15 [FBD]
 615 NetBSD 1.5.3            2002-07-22 [NBD] (patch release)
 616 FreeBSD 4.6.2           2002-08-15 [FBD] (patch release)
 617 Mac OS X 10.2           2002-08-23 [APL]
 618 NetBSD 1.6              2002-09-14 [NBD]
 619 FreeBSD 4.7             2002-10-08 [FBD]
 620 OpenBSD 3.2             2002-11-01 [OBD]
 621 FreeBSD 5.0             2003-01-17 [FBD]
 622                                 FreeBSD 5.0 is a separate branch off of
 623                                 -current, similar to 3.0.
 624 FreeBSD 4.8             2003-04-03 [FBD]
 625 NetBSD 1.6.1            2003-04-21 [NBD] (patch release)
 626 OpenBSD 3.3             2003-05-01 [OBD]
 627 BSD/OS 5.0              2003-05-?? [WRS]
 628 FreeBSD 5.1             2003-06-09 [FBD]
 629 Mac OS X 10.3           2003-10-24 [APL]
 630 FreeBSD 4.9             2003-10-28 [FBD]
 631 BSD/OS 5.1 ISE          2003-10-?? [WRS] (final version)
 632 OpenBSD 3.4             2003-11-01 [OBD]
 633 FreeBSD 5.2             2004-01-12 [FBD]
 634 FreeBSD 5.2.1           2004-02-22 [FBD] (patch release)
 635 NetBSD 1.6.2            2004-03-01 [NBD] (patch release)
 636 OpenBSD 3.5             2004-04-01 [OBD]
 637 FreeBSD 4.10            2004-05-27 [FBD]
 638 DragonFly 1.0           2004-07-12 [DFB]
 639 OpenBSD 3.6             2004-10-29 [OBD]
 640 FreeBSD 5.3             2004-11-06 [FBD]
 641 NetBSD 2.0              2004-12-09 [NBD]
 642 FreeBSD 4.11            2005-01-25 [FBD]
 643 DragonFly 1.2.0         2005-04-08 [DFB]
 644 NetBSD 2.0.2            2005-04-14 [NBD] (security/critical release)
 645 Mac OS X 10.4           2005-04-29 [APL]
 646 FreeBSD 5.4             2005-05-09 [FBD]
 647 OpenBSD 3.7             2005-05-19 [OBD]
 648 NetBSD 2.0.3            2005-10-31 [NBD] (security/critical release)
 649 OpenBSD 3.8             2005-11-01 [OBD]
 650 FreeBSD 6.0             2005-11-01 [FBD]
 651 NetBSD 2.1              2005-11-02 [NBD]
 652 NetBSD 3.0              2005-12-23 [NBD]
 653 DragonFly 1.4.0         2006-01-08 [DFB]
 654 FreeBSD 2.2.9           2006-04-01 [FBD]
 655 OpenBSD 3.9             2006-05-01 [OBD]
 656 FreeBSD 6.1             2006-05-08 [FBD]
 657 FreeBSD 5.5             2006-05-25 [FBD]
 658 NetBSD 3.0.1            2006-07-24 [NBD] (security/critical release)
 659 DragonFly 1.6.0         2006-07-24 [DFB]
 660 OpenBSD 4.0             2006-11-01 [OBD]
 661 NetBSD 3.0.2            2006-11-04 [NBD] (security/critical release)
 662 NetBSD 3.1              2006-11-04 [NBD]
 663 FreeBSD 6.2             2007-01-15 [FBD]
 664 DragonFly 1.8.0         2007-01-30 [DFB]
 665 OpenBSD 4.1             2007-05-01 [OBD]
 666 DragonFly 1.10.0        2007-08-06 [DFB]
 667 Mac OS X 10.5           2007-10-26 [APL]
 668 OpenBSD 4.2             2007-11-01 [OBD]
 669 NetBSD 4.0              2007-12-19 [NBD]
 670 FreeBSD 6.3             2008-01-18 [FBD]
 671 DragonFly 1.12.0        2008-02-26 [DFB]
 672 FreeBSD 7.0             2008-02-27 [FBD]
 673 OpenBSD 4.3             2008-05-01 [OBD]
 674 DragonFly 2.0.0         2008-07-21 [DFB]
 675 OpenBSD 4.4             2008-11-01 [OBD]
 676 FreeBSD 6.4             2008-11-28 [FBD]
 677 FreeBSD 7.1             2009-01-04 [FBD]
 678 DragonFly 2.2.0         2009-02-17 [DFB]
 679 NetBSD 5.0              2009-04-29 [NBD]
 680 OpenBSD 4.5             2009-05-01 [OBD]
 681 FreeBSD 7.2             2009-05-04 [FBD]
 682 Mac OS X 10.6           2009-06-08 [APL]
 683 NetBSD 5.0.1            2009-08-02 [NBD] (security/critical release)
 684 DragonFly 2.4.0         2009-09-16 [DFB]
 685 OpenBSD 4.6             2009-10-18 [OBD]
 686 FreeBSD 8.0             2009-11-26 [FBD]
 687 NetBSD 5.0.2            2010-02-12 [NBD] (security/critical release)
 688 FreeBSD 7.3             2010-03-23 [FBD]
 689 DragonFly 2.6.0         2010-03-28 [DFB]
 690 OpenBSD 4.7             2010-05-19 [OBD]
 691 FreeBSD 8.1             2010-07-24 [FBD]
 692 DragonFly 2.8.2         2010-10-30 [DFB]
 693 OpenBSD 4.8             2010-11-01 [OBD]
 694 NetBSD 5.1              2010-11-19 [NBD]
 695 FreeBSD 7.4             2011-02-24 [FBD]
 696 FreeBSD 8.2             2011-02-24 [FBD]
 697 DragonFly 2.10.1        2011-04-26 [DFB]
 698 OpenBSD 4.9             2011-05-01 [OBD]
 699 Mac OS X 10.7           2011-07-20 [APL]
 700 OpenBSD 5.0             2011-11-01 [OBD]
 701 FreeBSD 9.0             2012-01-12 [FBD]
 702 NetBSD 5.1.2            2012-02-02 [NBD] (security/critical release)
 703 DragonFly 3.0.1         2012-02-21 [DFB]
 704 FreeBSD 8.3             2012-04-18 [FBD]
 705 OpenBSD 5.1             2012-05-01 [OBD]
 706 Mac OS X 10.8           2012-07-25 [APL]
 707 NetBSD 6.0              2012-10-17 [NBD]
 708 OpenBSD 5.2             2012-11-01 [OBD]
 709 DragonFly 3.2.1         2012-11-02 [DFB]
 710 NetBSD 5.2              2012-12-03 [NBD]
 711 NetBSD 6.0.1            2012-12-26 [NBD] (security/critical release)
 712 FreeBSD 9.1             2012-12-30 [FBD]
 713 DragonFly 3.4.1         2013-04-29 [DFB]
 714 OpenBSD 5.3             2013-05-01 [OBD]
 715 NetBSD 6.0.2            2013-05-18 [NBD] (security/critical release)
 716 NetBSD 6.1              2013-05-18 [NBD]
 717 FreeBSD 8.4             2013-06-07 [FBD]
 718 NetBSD 6.1.1            2013-08-22 [NBD]
 719 NetBSD 5.1.3            2013-09-29 [NBD]
 720 NetBSD 5.2.1            2013-09-29 [NBD]
 721 FreeBSD 9.2             2013-09-30 [FBD]
 722 NetBSD 6.0.3            2013-09-30 [NBD]
 723 NetBSD 6.1.2            2013-09-30 [NBD]
 724 Mac OS X 10.9           2013-10-22 [APL]
 725 OpenBSD 5.4             2013-11-01 [OBD]
 726 DragonFly 3.6.0         2013-11-25 [DFB]
 727 FreeBSD 10.0            2014-01-20 [FBD]
 728 NetBSD 5.1.4            2014-01-25 [NBD]
 729 NetBSD 5.2.2            2014-01-25 [NBD]
 730 NetBSD 6.0.4            2014-01-25 [NBD]
 731 NetBSD 6.1.3            2014-01-25 [NBD]
 732 DragonFly 3.6.1         2014-02-22 [DFB]
 733 DragonFly 3.6.2         2014-04-10 [DFB]
 734 NetBSD 6.0.5            2014-04-12 [NBD]
 735 NetBSD 6.1.4            2014-04-12 [NBD]
 736 OpenBSD 5.5             2014-05-01 [OBD]
 737 DragonFly 3.8.0         2014-06-04 [DFB]
 738 DragonFly 3.8.1         2014-06-16 [DFB]
 739 DragonFly 3.6.3         2014-06-17 [DFB]
 740 FreeBSD 9.3             2014-07-05 [FBD]
 741 DragonFly 3.8.2         2014-08-08 [DFB]
 742 NetBSD 6.0.6            2014-09-22 [NBD]
 743 NetBSD 6.1.5            2014-09-22 [NBD]
 744 Mac OS X 10.10          2014-10-16 [APL]
 745 OpenBSD 5.6             2014-11-01 [OBD]
 746 FreeBSD 10.1            2014-11-14 [FBD]
 747 DragonFly 4.0.1         2014-11-25 [DFB]
 748 DragonFly 4.0.2         2015-01-07 [DFB]
 749 DragonFly 4.0.3         2015-01-21 [DFB]
 750 DragonFly 4.0.4         2015-03-09 [DFB]
 751 DragonFly 4.0.5         2015-03-23 [DFB]
 752 OpenBSD 5.7             2015-05-01 [OBD]
 753 DragonFly 4.2.0         2015-06-29 [DFB]
 754 FreeBSD 10.2            2015-08-13 [FBD]
 755 NetBSD 7.0              2015-09-25 [NBD]
 756 OS X 10.11              2015-09-30 [APL]
 757 OpenBSD 5.8             2015-10-18 [OBD]
 758 DragonFly 4.4.1         2015-12-07 [DFB]
 759 OpenBSD 5.9             2016-03-29 [OBD]
 760 FreeBSD 10.3            2016-04-04 [FBD]
 761 NetBSD 7.0.1            2016-05-22 [NBD]
 762 DragonFly 4.6.0         2016-08-02 [DFB]
 763 OpenBSD 6.0             2016-09-01 [OBD]
 764 macOS 10.12             2016-09-20 [APL]
 765 FreeBSD 11.0            2016-10-10 [FBD]
 766 NetBSD 7.0.2            2016-10-21 [NBD]
 767 NetBSD 7.1              2017-03-11 [NBD]
 768 DragonFly 4.8.0         2017-03-27 [DFB]
 769 OpenBSD 6.1             2017-04-11 [OBD]
 770 FreeBSD 11.1            2017-07-26 [FBD]
 771 macOS 10.13             2017-09-25 [APL]
 772 FreeBSD 10.4            2017-10-03 [FBD]
 773 OpenBSD 6.2             2017-10-09 [OBD]
 774 DragonFly 5.0.0         2017-10-16 [DFB]
 775 DragonFly 5.0.1         2017-11-06 [DFB]
 776 DragonFly 5.0.2         2017-12-04 [DFB]
 777 NetBSD 7.1.1            2017-12-22 [NBD]
 778 NetBSD 7.1.2            2018-03-15 [NBD]
 779 OpenBSD 6.3             2018-04-02 [OBD]
 780 DragonFly 5.2.0         2018-04-10 [DFB]
 781 DragonFly 5.2.1         2018-05-20 [DFB]
 782 DragonFly 5.2.2         2018-06-18 [DFB]
 783 FreeBSD 11.2            2018-06-27 [FBD]
 784 NetBSD 8.0              2018-07-17 [NBD]
 785 NetBSD 7.2              2018-08-29 [NBD]
 786 macOS 10.14             2018-09-24 [APL]
 787 OpenBSD 6.4             2018-10-18 [OBD]
 788 DragonFly 5.4.0         2018-12-03 [DFB]
 789 FreeBSD 12.0            2018-12-11 [FBD]
 790 DragonFly 5.4.1         2018-12-24 [DFB]
 791 OpenBSD 6.5             2019-05-01 [OBD]
 792 NetBSD 8.1              2019-06-04 [NBD]
 793 DragonFly 5.6           2019-06-17 [DFB]
 794 DragonFly 5.6.1         2019-06-19 [DFB]
 795 FreeBSD 11.3            2019-07-09 [FBD]
 796 OpenBSD 6.6             2019-10-17 [OBD]
 797 FreeBSD 12.1            2019-11-04 [FBD]
 798
 799 Bibliography
 800 ------------------------
 801
 802 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
 803 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
 804 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
 805
 806 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
 807 Company, Inc., 1994. ISBN 0-201-54777-5
 808
 809 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
 810 Quarterman. The Design and Implementation of the 4.4BSD Operating
 811 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
 812
 813 McKusick, Marshall Kirk, George Neville-Neil. The Design and
 814 Implementation of the FreeBSD Operating System.
 815 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
 816
 817 McKusick, Marshall Kirk, George Neville-Neil, Robert Watson. The
 818 Design and Implementation of the FreeBSD Operating System, 2nd Edition.
 819 Pearson Education, Inc., 2014. ISBN 0-321-96897-2
 820
 821 Doug McIlroy. Research Unix Reader.
 822
 823 Michael G. Brown. The Role of BSD in the Development of Unix.
 824 Presented to the Tasmanian Unix Special Interest Group of the
 825 Australian Computer Society, Hobart, August 1993.
 826
 827 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
 828 URL: http://www.byte.com/art/9410/sec8/art3.htm
 829
 830 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
 831 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
 832
 833 BSD Release Announcements collection.
 834 URL: https://www.FreeBSD.org/releases/
 835
 836 BSD Hypertext Man Pages
 837 URL: https://www.FreeBSD.org/cgi/man.cgi
 838
 839 UNIX history graphing project
 840 URL: http://minnie.tuhs.org/Unix_History/index.html
 841
 842 UNIX history
 843 URL: http://www.levenez.com/unix/
 844
 845 James Howard: The BSD Family Tree
 846 URL: http://ezine.daemonnews.org/200104/bsd_family.html
 847 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
 848
 849
 850 Acknowledgments
 851 ---------------
 852
 853 Josh Gilliam for suggestions, bug fixes, and finding very old
 854 original BSD announcements from Usenet or tapes.
 855
 856 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
 857
 858 --
 859 Copyright (c) 1997-2012 Wolfram Schneider <wosch@FreeBSD.ORG>
 860 URL: https://svnweb.freebsd.org/base/head/share/misc/bsd-family-tree
 861
 862 $FreeBSD$