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   |       |      |   |                |                    |
 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  macOS    |   |                |                    |
 404  |     |     11.3   10.15    |   |                |                    |
 405  |  FreeBSD   |       |      |   |            OpenBSD 6.6              |
 406  |   12.1     |     macOS    |   `-------.        |                    |
 407  |     |      |    10.15.1   |           |        |            DragonFly 5.6.2
 408  |     |      |       |      *--NetBSD   |        |                    |
 409  |     |      |       |      |   9.0     |        |                    |
 410  |     |      |       |      |    |      |        |                    |
 411  |     |      |       |      |    |      |        |            DragonFly 5.8
 412  |     |      |       |      |    |      |        |                    |
 413  |     |      |       |      |    |      |        |            DragonFly 5.6.3
 414  |     |      |       |      |    |    NetBSD     |                    |
 415  |     |      |       |      |    |     8.2       |                    |
 416  |     |      |       |      |    |               |            DragonFly 5.8.1
 417  |     |      |       |      |    |           OpenBSD 6.7              |
 418  |     |   FreeBSD    |      |    |               |                    |
 419  |     |     11.4     |      |    |               |                    |
 420  |     |              |      |    |               |            DragonFly 5.8.2
 421  |     |              |      |    |               |            DragonFly 5.8.3
 422  |     |              |      |  NetBSD 9.1    OpenBSD 6.8              |
 423  |  FreeBSD         macOS    |    |               |                    |
 424  |   12.2            11      |    |               |                    |
 425  |     |              |      |    |               |                    |
 426  |     `------.       |      |    |               |                    |
 427  |            |       |      |    |               |                    |
 428  *--FreeBSD   |       |      |    |               |                    |
 429  |   13.0     |       |      |  NetBSD 9.2    OpenBSD 6.9      DragonFly 6.0.0
 430  |     |      |       |      |    |               |                    |
 431  |     |      |       |      |    |               |            DragonFly 6.0.1
 432  |     |      |       |      |    |               |                    |
 433  |     |   FreeBSD  macOS    |    |           OpenBSD 7.0              |
 434  |     |     12.3    12      |    |               |                    |
 435  |     |      |       |      |    |               |            DragonFly 6.2.1
 436  |     |      |       |      |    |           OpenBSD 7.1              |
 437  |  FreeBSD   |       |      |    |               |                    |
 438  |   13.1     |       |      |    |               |                    |
 439  |     |      |       |      |    |               |            DragonFly 6.2.2
 440  |     |      |       |      |  NetBSD 9.3        |                    |
 441  |     |      |     macOS    |                OpenBSD 7.2              |
 442  |     |      |      13      |                    |                    |
 443  |     |   FreeBSD    |      |                    |                    |
 444  |     |     12.4     |      |                    |                    |
 445  |     |              |      |                    |            DragonFly 6.4.0
 446  |     |              |      |                OpenBSD 7.3              |
 447  |  FreeBSD           |      |                    |                    |
 448  |   13.2             |      |                    |                    |
 449  |                    |      |                    |                    |
 450 FreeBSD 14 -current   |  NetBSD -current   OpenBSD -current    DragonFly -current
 451  |                    |      |                    |                    |
 452  v                    v      v                    v                    v
 453
 454 Time
 455 ----------------
 456
 457 Time tolerance +/- 6 months, depending on which book/article you read; if it
 458 was the announcement in Usenet or if it was available as tape.
 459
 460 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
 461         and John Quarterman. The Design and Implementation of
 462         the 4.4BSD Operating System.
 463 [APL] Apple website [https://www.apple.com/macosx/]
 464 [BSDI] Berkeley Software Design, Inc.
 465 [DFB] DragonFlyBSD Project, The.
 466 [DOC] README, COPYRIGHT on tape.
 467 [FBD] FreeBSD Project, The.
 468 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
 469         Volume 11, Info 4, April, 1987.
 470 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
 471         comp.bugs.4bsd.ucb-fixes, June 15, 1988.
 472 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
 473         Changes in the Kernel in 2.9BSD. Second Berkeley Software
 474         Distribution UNIX Version 2.9, July, 1983.
 475 [NBD] NetBSD Project, The.
 476 [OBD] OpenBSD Project, The.
 477 [QCU] Salus, Peter H. A quarter century of UNIX.
 478 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
 479 [TUHS] The Unix Historical Society.  https://minnie.tuhs.org/Unix_History/.
 480 [USE] Usenet announcement.
 481 [WRS] Wind River Systems, Inc.
 482 [dmr] Dennis Ritchie, via E-Mail
 483
 484 Multics                 1965
 485 UNIX                    Summer 1969
 486                                 DEC PDP-7
 487 First   Edition         1971-11-03 [QCU]
 488                                 DEC PDP-11/20, Assembler
 489 Second  Edition         1972-06-12 [QCU]
 490                                 10 UNIX installations
 491 Third   Edition         1973-02-xx [QCU]
 492                                 Pipes, 16 installations
 493 Fourth  Edition         1973-11-xx [QCU]
 494                                 rewriting in C effected,
 495                                 above 30 installations
 496 Fifth   Edition         1974-06-xx [QCU]
 497                                 above 50 installations
 498 Sixth   Edition         1975-05-xx [QCU]
 499                                 port to DEC Vax
 500 Seventh Edition         1979-01-xx [QCU] 1979-01-10 [TUHS]
 501                                 first portable UNIX
 502 Eighth  Edition         1985-02-xx [QCU]
 503                                 VAX 11/750, VAX 11/780 [dmr]
 504                                 descended from 4.1c BSD [dmr]
 505                                 descended from 4.1 BSD [44B]
 506                         scooping-out and replacement of the character-device
 507                         and networking part by the streams mechanism
 508
 509 Ninth   Edition         1986-09-xx [QCU]
 510 Tenth   Edition         1989-10-xx [QCU]
 511
 512 1BSD                    late 1977
 513                         1978-01-16 [DOC]
 514                         1978-03-09 [QCU]
 515                                 PDP-11, Pascal, ex(1)
 516                                 30 free copies of 1BSD sent out
 517                                 35 tapes sold for 50 USD [QCU]
 518 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
 519                                 75 2BSD tapes shipped
 520 2.79BSD                 1980-04-xx [TUHS]
 521 2.8BSD                  1981-07-xx [KSJ]
 522                                 First 2BSD with bootable V7 kernel plus
 523                                 community fixes.
 524 2.8.1BSD                1982-01-xx [QCU]
 525                                 set of performance improvements
 526 2.9BSD                  1983-07-xx [KSJ]
 527 2.9.1BSD                1983-11-xx [TUHS]
 528 2.9BSD-Seismo           1985-08-xx [SMS]
 529 2.10BSD                 1987-04-xx [KKK]
 530 2.10.1BSD               1989-01-xx [SMS]
 531 2.11BSD                 1991-03-14 [SMS]
 532 2.11BSD rev #430        1999-12-13 [SMS]
 533
 534 32V                     1978-1[01]-xx [QCU] 1979-03-26 [TUHS]
 535 3BSD                    late 1979 [QCU] March 1980 [TUHS]
 536                                 virtual memory, page replacement,
 537                                 demand paging
 538 4.0BSD                  1980-10-xx
 539 4.1BSD                  1981-07-08 [DOC]
 540 4.1aBSD                 1982-04-xx
 541                                 alpha release, 100 sites, networking [44B]
 542 4.1bBSD                         internal release, fast filesystem [44B]
 543 4.1cBSD                 late 1982
 544                                 beta release, IPC [44B]
 545 4.2BSD                  1983-09-xx [QCU]
 546                         1983-08-03 [DOC]
 547 4.3BSD                  1986-06-xx [QCU]
 548                         1986-04-05 [KB], [DOC]
 549 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
 550 4.3BSD NET/1            1988-11-xx [QCU]
 551                         1989-01-01 [DOC]
 552 4.3BSD Reno             1990-06-29 [QCU], [DOC]
 553 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
 554
 555 BSD/386 ALPHA           1991-12-xx [BSDI]
 556                                 first code released to people outside BSDI
 557 386BSD 0.0              1992-02-xx [DOC]
 558 BSD/386 0.3.1           1992-04-xx [BSDI] first ext. beta; B customers
 559 BSD/386 0.3.3           1992-06-xx [BSDI] first CDROM version
 560 386BSD 0.1              1992-07-28 [DOC]
 561 4.4BSD Alpha            1992-07-07
 562 BSD/386 0.9.3           1992-10-xx [BSDI]
 563                                 first external gamma; G customers
 564 BSD/386 0.9.4           1992-12-xx [BSDI]
 565                                 would have been 1.0 except for request
 566                                 for preliminary injunction
 567 BSD/386 1.0             1993-03-xx [BSDI]
 568                                 injunction denied; first official release
 569 NetBSD 0.8              1993-04-20 [NBD]
 570 4.4BSD                  1993-06-01 [USE]
 571 NetBSD 0.9              1993-08-23 [NBD]
 572 FreeBSD 1.0             1993-11-01 [FBD]
 573 FreeBSD 1.0.2           1993-11-14 [FBD]
 574                                 supersedes 1.0 13 days after release.
 575 BSD/386 1.1             1994-02-xx [BSDI]
 576 4.4BSD Lite             1994-03-01 [USE]
 577 FreeBSD 1.1             1994-05-07 [FBD]
 578 FreeBSD 1.1.5           1994-06-30 [FBD]
 579 FreeBSD 1.1.5.1         1994-07-05 [FBD]
 580                                 supersedes 1.1.5 5 days after release.
 581 NetBSD 1.0              1994-10-26 [NBD]
 582 386BSD 1.0              1994-11-12 [USE]
 583 FreeBSD 2.0             1994-11-23 [FBD]
 584 BSD/OS 2.0              1995-01-xx [BSDI] 4.4 lite based
 585 FreeBSD 2.0.5           1995-06-10 [FBD]
 586 BSD/OS 2.0.1            1995-06-xx [BSDI]
 587 4.4BSD Lite Release 2   1995-06-xx [44B]
 588                                 the true final distribution from the CSRG
 589 FreeBSD 2.1.0           1995-11-19 [FBD]
 590 NetBSD 1.1              1995-11-26 [NBD]
 591 BSD/OS 2.1              1996-01-xx [BSDI]
 592 FreeBSD 2.1.5           1996-07-14 [FBD]
 593 NetBSD 1.2              1996-10-04 [NBD]
 594 OpenBSD 2.0             1996-10-18 [OBD]
 595 FreeBSD 2.1.6           1996-11-16 [FBD]
 596 FreeBSD 2.1.6.1         1996-11-25 [FBD] (sendmail security release)
 597 Rhapsody                1997-xx-xx
 598 FreeBSD 2.1.7           1997-02-20 [FBD]
 599 BSD/OS 3.0              1997-02-xx [BSDI] 4.4 lite2 based
 600 FreeBSD 2.2.0           1997-03-16 [FBD]
 601 FreeBSD 2.2.1           1997-03-25 [FBD]
 602 FreeBSD 2.2.2           1997-05-16 [FBD]
 603 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
 604 OpenBSD 2.1             1997-06-01 [OBD]
 605 FreeBSD 2.2.5           1997-10-22 [FBD]
 606 OpenBSD 2.2             1997-12-01 [OBD]
 607 NetBSD 1.3              1998-01-04 [NBD]
 608 FreeBSD 2.2.6           1998-03-25 [FBD]
 609 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
 610 BSD/OS 3.1              1998-03-xx [BSDI]
 611 OpenBSD 2.3             1998-05-19 [OBD]
 612 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
 613 FreeBSD 2.2.7           1998-07-22 [FBD]
 614 BSD/OS 4.0              1998-08-xx [BSDI]
 615                                 2-lock MP support, ELF executables
 616 FreeBSD 3.0             1998-10-16 [FBD]
 617                                 FreeBSD-3.0 is a snapshot from -current,
 618                                 while 3.1 and 3.2 are from 3.x-stable which
 619                                 was branched quite some time after 3.0-release
 620 FreeBSD 2.2.8           1998-11-29 [FBD]
 621 OpenBSD 2.4             1998-12-01 [OBD]
 622 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
 623 FreeBSD 3.1             1999-02-15 [FBD]
 624 BSD/OS 4.0.1            1999-03-xx [BSDI]
 625 NetBSD 1.4              1999-05-12 [NBD]
 626 FreeBSD 3.2             1999-05-17 [FBD]
 627 OpenBSD 2.5             1999-05-19 [OBD]
 628 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
 629 FreeBSD 3.3             1999-09-17 [FBD]
 630 OpenBSD 2.6             1999-12-01 [OBD]
 631 FreeBSD 3.4             1999-12-20 [FBD]
 632 BSD/OS 4.1              1999-12-xx [BSDI]
 633 FreeBSD 4.0             2000-03-13 [FBD]
 634 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
 635 OpenBSD 2.7             2000-06-15 [OBD]
 636 FreeBSD 3.5             2000-06-24 [FBD]
 637 FreeBSD 4.1             2000-07-27 [FBD]
 638 FreeBSD 3.5.1           2000-07-28 [FBD]
 639 FreeBSD 4.1.1           2000-09-25 [FBD] (a network-only patch release)
 640 FreeBSD 4.2             2000-11-21 [FBD]
 641 NetBSD 1.4.3            2000-11-25 [NBD] (patch release)
 642 BSD/OS 4.2              2000-11-29 [BSDI]
 643 OpenBSD 2.8             2000-12-01 [OBD]
 644 NetBSD 1.5              2000-12-06 [NBD]
 645 Mac OS X 10.0           2001-03-24 [APL]
 646 FreeBSD 4.3             2001-04-20 [FBD]
 647 OpenBSD 2.9             2001-06-01 [OBD]
 648 NetBSD 1.5.1            2001-07-11 [NBD] (patch release)
 649 NetBSD 1.5.2            2001-09-13 [NBD] (patch release)
 650 FreeBSD 4.4             2001-09-18 [FBD]
 651 Mac OS X 10.1           2001-09-29 [APL]
 652 OpenBSD 3.0             2001-12-01 [OBD]
 653 FreeBSD 4.5             2002-01-29 [FBD]
 654 BSD/OS 4.3              2002-03-14 [WRS]
 655 OpenBSD 3.1             2002-05-19 [OBD]
 656 FreeBSD 4.6             2002-06-15 [FBD]
 657 NetBSD 1.5.3            2002-07-22 [NBD] (patch release)
 658 FreeBSD 4.6.2           2002-08-15 [FBD] (patch release)
 659 Mac OS X 10.2           2002-08-23 [APL]
 660 NetBSD 1.6              2002-09-14 [NBD]
 661 FreeBSD 4.7             2002-10-08 [FBD]
 662 OpenBSD 3.2             2002-11-01 [OBD]
 663 FreeBSD 5.0             2003-01-17 [FBD]
 664                                 FreeBSD 5.0 is a separate branch off of
 665                                 -current, similar to 3.0.
 666 FreeBSD 4.8             2003-04-03 [FBD]
 667 NetBSD 1.6.1            2003-04-21 [NBD] (patch release)
 668 OpenBSD 3.3             2003-05-01 [OBD]
 669 BSD/OS 5.0              2003-05-?? [WRS]
 670 FreeBSD 5.1             2003-06-09 [FBD]
 671 Mac OS X 10.3           2003-10-24 [APL]
 672 FreeBSD 4.9             2003-10-28 [FBD]
 673 BSD/OS 5.1 ISE          2003-10-?? [WRS] (final version)
 674 OpenBSD 3.4             2003-11-01 [OBD]
 675 FreeBSD 5.2             2004-01-12 [FBD]
 676 FreeBSD 5.2.1           2004-02-22 [FBD] (patch release)
 677 NetBSD 1.6.2            2004-03-01 [NBD] (patch release)
 678 OpenBSD 3.5             2004-04-01 [OBD]
 679 FreeBSD 4.10            2004-05-27 [FBD]
 680 DragonFly 1.0           2004-07-12 [DFB]
 681 OpenBSD 3.6             2004-10-29 [OBD]
 682 FreeBSD 5.3             2004-11-06 [FBD]
 683 NetBSD 2.0              2004-12-09 [NBD]
 684 FreeBSD 4.11            2005-01-25 [FBD]
 685 DragonFly 1.2.0         2005-04-08 [DFB]
 686 NetBSD 2.0.2            2005-04-14 [NBD] (security/critical release)
 687 Mac OS X 10.4           2005-04-29 [APL]
 688 FreeBSD 5.4             2005-05-09 [FBD]
 689 OpenBSD 3.7             2005-05-19 [OBD]
 690 NetBSD 2.0.3            2005-10-31 [NBD] (security/critical release)
 691 OpenBSD 3.8             2005-11-01 [OBD]
 692 FreeBSD 6.0             2005-11-01 [FBD]
 693 NetBSD 2.1              2005-11-02 [NBD]
 694 NetBSD 3.0              2005-12-23 [NBD]
 695 DragonFly 1.4.0         2006-01-08 [DFB]
 696 FreeBSD 2.2.9           2006-04-01 [FBD]
 697 OpenBSD 3.9             2006-05-01 [OBD]
 698 FreeBSD 6.1             2006-05-08 [FBD]
 699 FreeBSD 5.5             2006-05-25 [FBD]
 700 NetBSD 3.0.1            2006-07-24 [NBD] (security/critical release)
 701 DragonFly 1.6.0         2006-07-24 [DFB]
 702 OpenBSD 4.0             2006-11-01 [OBD]
 703 NetBSD 3.0.2            2006-11-04 [NBD] (security/critical release)
 704 NetBSD 3.1              2006-11-04 [NBD]
 705 FreeBSD 6.2             2007-01-15 [FBD]
 706 DragonFly 1.8.0         2007-01-30 [DFB]
 707 OpenBSD 4.1             2007-05-01 [OBD]
 708 DragonFly 1.10.0        2007-08-06 [DFB]
 709 Mac OS X 10.5           2007-10-26 [APL]
 710 OpenBSD 4.2             2007-11-01 [OBD]
 711 NetBSD 4.0              2007-12-19 [NBD]
 712 FreeBSD 6.3             2008-01-18 [FBD]
 713 DragonFly 1.12.0        2008-02-26 [DFB]
 714 FreeBSD 7.0             2008-02-27 [FBD]
 715 OpenBSD 4.3             2008-05-01 [OBD]
 716 DragonFly 2.0.0         2008-07-21 [DFB]
 717 OpenBSD 4.4             2008-11-01 [OBD]
 718 FreeBSD 6.4             2008-11-28 [FBD]
 719 FreeBSD 7.1             2009-01-04 [FBD]
 720 DragonFly 2.2.0         2009-02-17 [DFB]
 721 NetBSD 5.0              2009-04-29 [NBD]
 722 OpenBSD 4.5             2009-05-01 [OBD]
 723 FreeBSD 7.2             2009-05-04 [FBD]
 724 Mac OS X 10.6           2009-06-08 [APL]
 725 NetBSD 5.0.1            2009-08-02 [NBD] (security/critical release)
 726 DragonFly 2.4.0         2009-09-16 [DFB]
 727 OpenBSD 4.6             2009-10-18 [OBD]
 728 FreeBSD 8.0             2009-11-26 [FBD]
 729 NetBSD 5.0.2            2010-02-12 [NBD] (security/critical release)
 730 FreeBSD 7.3             2010-03-23 [FBD]
 731 DragonFly 2.6.0         2010-03-28 [DFB]
 732 OpenBSD 4.7             2010-05-19 [OBD]
 733 FreeBSD 8.1             2010-07-24 [FBD]
 734 DragonFly 2.8.2         2010-10-30 [DFB]
 735 OpenBSD 4.8             2010-11-01 [OBD]
 736 NetBSD 5.1              2010-11-19 [NBD]
 737 FreeBSD 7.4             2011-02-24 [FBD]
 738 FreeBSD 8.2             2011-02-24 [FBD]
 739 DragonFly 2.10.1        2011-04-26 [DFB]
 740 OpenBSD 4.9             2011-05-01 [OBD]
 741 Mac OS X 10.7           2011-07-20 [APL]
 742 OpenBSD 5.0             2011-11-01 [OBD]
 743 FreeBSD 9.0             2012-01-12 [FBD]
 744 NetBSD 5.1.2            2012-02-02 [NBD] (security/critical release)
 745 DragonFly 3.0.1         2012-02-21 [DFB]
 746 FreeBSD 8.3             2012-04-18 [FBD]
 747 OpenBSD 5.1             2012-05-01 [OBD]
 748 Mac OS X 10.8           2012-07-25 [APL]
 749 NetBSD 6.0              2012-10-17 [NBD]
 750 OpenBSD 5.2             2012-11-01 [OBD]
 751 DragonFly 3.2.1         2012-11-02 [DFB]
 752 NetBSD 5.2              2012-12-03 [NBD]
 753 NetBSD 6.0.1            2012-12-26 [NBD] (security/critical release)
 754 FreeBSD 9.1             2012-12-30 [FBD]
 755 DragonFly 3.4.1         2013-04-29 [DFB]
 756 OpenBSD 5.3             2013-05-01 [OBD]
 757 NetBSD 6.0.2            2013-05-18 [NBD] (security/critical release)
 758 NetBSD 6.1              2013-05-18 [NBD]
 759 FreeBSD 8.4             2013-06-07 [FBD]
 760 NetBSD 6.1.1            2013-08-22 [NBD]
 761 NetBSD 5.1.3            2013-09-29 [NBD]
 762 NetBSD 5.2.1            2013-09-29 [NBD]
 763 FreeBSD 9.2             2013-09-30 [FBD]
 764 NetBSD 6.0.3            2013-09-30 [NBD]
 765 NetBSD 6.1.2            2013-09-30 [NBD]
 766 Mac OS X 10.9           2013-10-22 [APL]
 767 OpenBSD 5.4             2013-11-01 [OBD]
 768 DragonFly 3.6.0         2013-11-25 [DFB]
 769 FreeBSD 10.0            2014-01-20 [FBD]
 770 NetBSD 5.1.4            2014-01-25 [NBD]
 771 NetBSD 5.2.2            2014-01-25 [NBD]
 772 NetBSD 6.0.4            2014-01-25 [NBD]
 773 NetBSD 6.1.3            2014-01-25 [NBD]
 774 DragonFly 3.6.1         2014-02-22 [DFB]
 775 DragonFly 3.6.2         2014-04-10 [DFB]
 776 NetBSD 6.0.5            2014-04-12 [NBD]
 777 NetBSD 6.1.4            2014-04-12 [NBD]
 778 OpenBSD 5.5             2014-05-01 [OBD]
 779 DragonFly 3.8.0         2014-06-04 [DFB]
 780 DragonFly 3.8.1         2014-06-16 [DFB]
 781 DragonFly 3.6.3         2014-06-17 [DFB]
 782 FreeBSD 9.3             2014-07-05 [FBD]
 783 DragonFly 3.8.2         2014-08-08 [DFB]
 784 NetBSD 6.0.6            2014-09-22 [NBD]
 785 NetBSD 6.1.5            2014-09-22 [NBD]
 786 Mac OS X 10.10          2014-10-16 [APL]
 787 OpenBSD 5.6             2014-11-01 [OBD]
 788 FreeBSD 10.1            2014-11-14 [FBD]
 789 DragonFly 4.0.1         2014-11-25 [DFB]
 790 DragonFly 4.0.2         2015-01-07 [DFB]
 791 DragonFly 4.0.3         2015-01-21 [DFB]
 792 DragonFly 4.0.4         2015-03-09 [DFB]
 793 DragonFly 4.0.5         2015-03-23 [DFB]
 794 OpenBSD 5.7             2015-05-01 [OBD]
 795 DragonFly 4.2.0         2015-06-29 [DFB]
 796 FreeBSD 10.2            2015-08-13 [FBD]
 797 NetBSD 7.0              2015-09-25 [NBD]
 798 OS X 10.11              2015-09-30 [APL]
 799 OpenBSD 5.8             2015-10-18 [OBD]
 800 DragonFly 4.4.1         2015-12-07 [DFB]
 801 OpenBSD 5.9             2016-03-29 [OBD]
 802 FreeBSD 10.3            2016-04-04 [FBD]
 803 NetBSD 7.0.1            2016-05-22 [NBD]
 804 DragonFly 4.6.0         2016-08-02 [DFB]
 805 OpenBSD 6.0             2016-09-01 [OBD]
 806 macOS 10.12             2016-09-20 [APL]
 807 FreeBSD 11.0            2016-10-10 [FBD]
 808 NetBSD 7.0.2            2016-10-21 [NBD]
 809 NetBSD 7.1              2017-03-11 [NBD]
 810 DragonFly 4.8.0         2017-03-27 [DFB]
 811 OpenBSD 6.1             2017-04-11 [OBD]
 812 FreeBSD 11.1            2017-07-26 [FBD]
 813 macOS 10.13             2017-09-25 [APL]
 814 FreeBSD 10.4            2017-10-03 [FBD]
 815 OpenBSD 6.2             2017-10-09 [OBD]
 816 DragonFly 5.0.0         2017-10-16 [DFB]
 817 DragonFly 5.0.1         2017-11-06 [DFB]
 818 DragonFly 5.0.2         2017-12-04 [DFB]
 819 NetBSD 7.1.1            2017-12-22 [NBD]
 820 NetBSD 7.1.2            2018-03-15 [NBD]
 821 OpenBSD 6.3             2018-04-02 [OBD]
 822 DragonFly 5.2.0         2018-04-10 [DFB]
 823 DragonFly 5.2.1         2018-05-20 [DFB]
 824 DragonFly 5.2.2         2018-06-18 [DFB]
 825 FreeBSD 11.2            2018-06-27 [FBD]
 826 NetBSD 8.0              2018-07-17 [NBD]
 827 NetBSD 7.2              2018-08-29 [NBD]
 828 macOS 10.14             2018-09-24 [APL]
 829 OpenBSD 6.4             2018-10-18 [OBD]
 830 DragonFly 5.4.0         2018-12-03 [DFB]
 831 FreeBSD 12.0            2018-12-11 [FBD]
 832 DragonFly 5.4.1         2018-12-24 [DFB]
 833 OpenBSD 6.5             2019-05-01 [OBD]
 834 NetBSD 8.1              2019-06-04 [NBD]
 835 DragonFly 5.6           2019-06-17 [DFB]
 836 DragonFly 5.6.1         2019-06-19 [DFB]
 837 FreeBSD 11.3            2019-07-09 [FBD]
 838 DragonFly 5.6.2         2019-08-11 [DFB]
 839 OpenBSD 6.6             2019-10-17 [OBD]
 840 macOS 10.15             2019-10-07 [APL]
 841 macOS 10.15.1           2019-10-29 [APL] (security/critical release)
 842 FreeBSD 12.1            2019-11-04 [FBD]
 843 NetBSD 9.0              2020-02-14 [NBD]
 844 DragonFly 5.8           2020-03-03 [DFB]
 845 DragonFly 5.6.3         2020-03-11 [DFB]
 846 NetBSD 8.2              2020-03-31 [NBD]
 847 DragonFly 5.8.1         2020-05-06 [DFB]
 848 OpenBSD 6.7             2020-05-19 [OBD]
 849 FreeBSD 11.4            2020-06-16 [FBD]
 850 DragonFly 5.8.2         2020-09-23 [DFB]
 851 DragonFly 5.8.3         2020-09-24 [DFB]
 852 OpenBSD 6.8             2020-10-18 [OBD]
 853 NetBSD 9.1              2020-10-18 [NBD]
 854 FreeBSD 12.2            2020-10-27 [FBD]
 855 macOS 11                2020-11-19 [APL]
 856 FreeBSD 13.0            2021-04-13 [FBD]
 857 OpenBSD 6.9             2021-05-01 [OBD]
 858 DragonFly 6.0           2021-05-08 [DFB]
 859 NetBSD 9.2              2021-05-12 [NBD]
 860 DragonFly 6.0.1         2021-10-12 [DFB]
 861 OpenBSD 7.0             2021-10-14 [OBD]
 862 macOS 12                2021-10-25 [APL]
 863 FreeBSD 12.3            2021-12-01 [FBD]
 864 DragonFly 6.2.1         2022-01-09 [DFB]
 865 OpenBSD 7.1             2022-04-21 [OBD]
 866 FreeBSD 13.1            2022-05-17 [FBD]
 867 DragonFly 6.2.2         2022-06-09 [DFB]
 868 NetBSD 9.3              2022-08-04 [NBD]
 869 OpenBSD 7.2             2022-10-20 [OBD]
 870 macOS 13                2022-10-24 [APL]
 871 FreeBSD 12.4            2022-12-05 [FBD]
 872 DragonFly 6.4           2022-12-30 [DFB]
 873 OpenBSD 7.3             2023-04-10 [OBD]
 874 FreeBSD 13.2            2023-04-11 [FBD]
 875
 876 Bibliography
 877 ------------------------
 878
 879 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
 880 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
 881 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
 882
 883 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
 884 Company, Inc., 1994. ISBN 0-201-54777-5
 885
 886 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
 887 Quarterman. The Design and Implementation of the 4.4BSD Operating
 888 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
 889
 890 McKusick, Marshall Kirk, George Neville-Neil. The Design and
 891 Implementation of the FreeBSD Operating System.
 892 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
 893
 894 McKusick, Marshall Kirk, George Neville-Neil, Robert Watson. The
 895 Design and Implementation of the FreeBSD Operating System, 2nd Edition.
 896 Pearson Education, Inc., 2014. ISBN 0-321-96897-2
 897
 898 Doug McIlroy. Research Unix Reader.
 899
 900 Michael G. Brown. The Role of BSD in the Development of Unix.
 901 Presented to the Tasmanian Unix Special Interest Group of the
 902 Australian Computer Society, Hobart, August 1993.
 903
 904 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
 905 URL: https://web.archive.org/web/20081230094857/http://www.byte.com/art/9410/sec8/art3.htm
 906
 907 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
 908 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
 909
 910 BSD Release Announcements collection.
 911 URL: https://www.FreeBSD.org/releases/
 912
 913 BSD Hypertext Man Pages
 914 URL: https://www.FreeBSD.org/cgi/man.cgi
 915
 916 UNIX history graphing project
 917 URL: https://minnie.tuhs.org/Unix_History/index.html
 918
 919 UNIX history
 920 URL: https://www.levenez.com/unix/
 921
 922 James Howard: The BSD Family Tree
 923 URL: https://web.archive.org/web/20090427195917/http://ezine.daemonnews.org/200104/bsd_family.html
 924 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
 925
 926
 927 Acknowledgments
 928 ---------------
 929
 930 Josh Gilliam for suggestions, bug fixes, and finding very old
 931 original BSD announcements from Usenet or tapes.
 932
 933 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
 934
 935 --
 936 Copyright (c) 1997-2012 Wolfram Schneider <wosch@FreeBSD.ORG>
 937 URL: https://cgit.freebsd.org/src/tree/share/misc/bsd-family-tree
 938
 939 $FreeBSD$