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  |                  macOS    |                    |                    |
 450  |                   14      |                    |                    |
 451  |                    |      |                OpenBSD 7.4              |
 452  |                    |      |                    |                    |
 453 FreeBSD 14 -current   |  NetBSD -current   OpenBSD -current    DragonFly -current
 454  |                    |      |                    |                    |
 455  v                    v      v                    v                    v
 456
 457 Time
 458 ----------------
 459
 460 Time tolerance +/- 6 months, depending on which book/article you read; if it
 461 was the announcement in Usenet or if it was available as tape.
 462
 463 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
 464         and John Quarterman. The Design and Implementation of
 465         the 4.4BSD Operating System.
 466 [APL] Apple website [https://www.apple.com/macosx/]
 467 [BSDI] Berkeley Software Design, Inc.
 468 [DFB] DragonFlyBSD Project, The.
 469 [DOC] README, COPYRIGHT on tape.
 470 [FBD] FreeBSD Project, The.
 471 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
 472         Volume 11, Info 4, April, 1987.
 473 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
 474         comp.bugs.4bsd.ucb-fixes, June 15, 1988.
 475 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
 476         Changes in the Kernel in 2.9BSD. Second Berkeley Software
 477         Distribution UNIX Version 2.9, July, 1983.
 478 [NBD] NetBSD Project, The.
 479 [OBD] OpenBSD Project, The.
 480 [QCU] Salus, Peter H. A quarter century of UNIX.
 481 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
 482 [TUHS] The Unix Historical Society.  https://minnie.tuhs.org/Unix_History/.
 483 [USE] Usenet announcement.
 484 [WRS] Wind River Systems, Inc.
 485 [dmr] Dennis Ritchie, via E-Mail
 486
 487 Multics                 1965
 488 UNIX                    Summer 1969
 489                                 DEC PDP-7
 490 First   Edition         1971-11-03 [QCU]
 491                                 DEC PDP-11/20, Assembler
 492 Second  Edition         1972-06-12 [QCU]
 493                                 10 UNIX installations
 494 Third   Edition         1973-02-xx [QCU]
 495                                 Pipes, 16 installations
 496 Fourth  Edition         1973-11-xx [QCU]
 497                                 rewriting in C effected,
 498                                 above 30 installations
 499 Fifth   Edition         1974-06-xx [QCU]
 500                                 above 50 installations
 501 Sixth   Edition         1975-05-xx [QCU]
 502                                 port to DEC Vax
 503 Seventh Edition         1979-01-xx [QCU] 1979-01-10 [TUHS]
 504                                 first portable UNIX
 505 Eighth  Edition         1985-02-xx [QCU]
 506                                 VAX 11/750, VAX 11/780 [dmr]
 507                                 descended from 4.1c BSD [dmr]
 508                                 descended from 4.1 BSD [44B]
 509                         scooping-out and replacement of the character-device
 510                         and networking part by the streams mechanism
 511
 512 Ninth   Edition         1986-09-xx [QCU]
 513 Tenth   Edition         1989-10-xx [QCU]
 514
 515 1BSD                    late 1977
 516                         1978-01-16 [DOC]
 517                         1978-03-09 [QCU]
 518                                 PDP-11, Pascal, ex(1)
 519                                 30 free copies of 1BSD sent out
 520                                 35 tapes sold for 50 USD [QCU]
 521 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
 522                                 75 2BSD tapes shipped
 523 2.79BSD                 1980-04-xx [TUHS]
 524 2.8BSD                  1981-07-xx [KSJ]
 525                                 First 2BSD with bootable V7 kernel plus
 526                                 community fixes.
 527 2.8.1BSD                1982-01-xx [QCU]
 528                                 set of performance improvements
 529 2.9BSD                  1983-07-xx [KSJ]
 530 2.9.1BSD                1983-11-xx [TUHS]
 531 2.9BSD-Seismo           1985-08-xx [SMS]
 532 2.10BSD                 1987-04-xx [KKK]
 533 2.10.1BSD               1989-01-xx [SMS]
 534 2.11BSD                 1991-03-14 [SMS]
 535 2.11BSD rev #430        1999-12-13 [SMS]
 536
 537 32V                     1978-1[01]-xx [QCU] 1979-03-26 [TUHS]
 538 3BSD                    late 1979 [QCU] March 1980 [TUHS]
 539                                 virtual memory, page replacement,
 540                                 demand paging
 541 4.0BSD                  1980-10-xx
 542 4.1BSD                  1981-07-08 [DOC]
 543 4.1aBSD                 1982-04-xx
 544                                 alpha release, 100 sites, networking [44B]
 545 4.1bBSD                         internal release, fast filesystem [44B]
 546 4.1cBSD                 late 1982
 547                                 beta release, IPC [44B]
 548 4.2BSD                  1983-09-xx [QCU]
 549                         1983-08-03 [DOC]
 550 4.3BSD                  1986-06-xx [QCU]
 551                         1986-04-05 [KB], [DOC]
 552 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
 553 4.3BSD NET/1            1988-11-xx [QCU]
 554                         1989-01-01 [DOC]
 555 4.3BSD Reno             1990-06-29 [QCU], [DOC]
 556 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
 557
 558 BSD/386 ALPHA           1991-12-xx [BSDI]
 559                                 first code released to people outside BSDI
 560 386BSD 0.0              1992-02-xx [DOC]
 561 BSD/386 0.3.1           1992-04-xx [BSDI] first ext. beta; B customers
 562 BSD/386 0.3.3           1992-06-xx [BSDI] first CDROM version
 563 386BSD 0.1              1992-07-28 [DOC]
 564 4.4BSD Alpha            1992-07-07
 565 BSD/386 0.9.3           1992-10-xx [BSDI]
 566                                 first external gamma; G customers
 567 BSD/386 0.9.4           1992-12-xx [BSDI]
 568                                 would have been 1.0 except for request
 569                                 for preliminary injunction
 570 BSD/386 1.0             1993-03-xx [BSDI]
 571                                 injunction denied; first official release
 572 NetBSD 0.8              1993-04-20 [NBD]
 573 4.4BSD                  1993-06-01 [USE]
 574 NetBSD 0.9              1993-08-23 [NBD]
 575 FreeBSD 1.0             1993-11-01 [FBD]
 576 FreeBSD 1.0.2           1993-11-14 [FBD]
 577                                 supersedes 1.0 13 days after release.
 578 BSD/386 1.1             1994-02-xx [BSDI]
 579 4.4BSD Lite             1994-03-01 [USE]
 580 FreeBSD 1.1             1994-05-07 [FBD]
 581 FreeBSD 1.1.5           1994-06-30 [FBD]
 582 FreeBSD 1.1.5.1         1994-07-05 [FBD]
 583                                 supersedes 1.1.5 5 days after release.
 584 NetBSD 1.0              1994-10-26 [NBD]
 585 386BSD 1.0              1994-11-12 [USE]
 586 FreeBSD 2.0             1994-11-23 [FBD]
 587 BSD/OS 2.0              1995-01-xx [BSDI] 4.4 lite based
 588 FreeBSD 2.0.5           1995-06-10 [FBD]
 589 BSD/OS 2.0.1            1995-06-xx [BSDI]
 590 4.4BSD Lite Release 2   1995-06-xx [44B]
 591                                 the true final distribution from the CSRG
 592 FreeBSD 2.1.0           1995-11-19 [FBD]
 593 NetBSD 1.1              1995-11-26 [NBD]
 594 BSD/OS 2.1              1996-01-xx [BSDI]
 595 FreeBSD 2.1.5           1996-07-14 [FBD]
 596 NetBSD 1.2              1996-10-04 [NBD]
 597 OpenBSD 2.0             1996-10-18 [OBD]
 598 FreeBSD 2.1.6           1996-11-16 [FBD]
 599 FreeBSD 2.1.6.1         1996-11-25 [FBD] (sendmail security release)
 600 Rhapsody                1997-xx-xx
 601 FreeBSD 2.1.7           1997-02-20 [FBD]
 602 BSD/OS 3.0              1997-02-xx [BSDI] 4.4 lite2 based
 603 FreeBSD 2.2.0           1997-03-16 [FBD]
 604 FreeBSD 2.2.1           1997-03-25 [FBD]
 605 FreeBSD 2.2.2           1997-05-16 [FBD]
 606 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
 607 OpenBSD 2.1             1997-06-01 [OBD]
 608 FreeBSD 2.2.5           1997-10-22 [FBD]
 609 OpenBSD 2.2             1997-12-01 [OBD]
 610 NetBSD 1.3              1998-01-04 [NBD]
 611 FreeBSD 2.2.6           1998-03-25 [FBD]
 612 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
 613 BSD/OS 3.1              1998-03-xx [BSDI]
 614 OpenBSD 2.3             1998-05-19 [OBD]
 615 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
 616 FreeBSD 2.2.7           1998-07-22 [FBD]
 617 BSD/OS 4.0              1998-08-xx [BSDI]
 618                                 2-lock MP support, ELF executables
 619 FreeBSD 3.0             1998-10-16 [FBD]
 620                                 FreeBSD-3.0 is a snapshot from -current,
 621                                 while 3.1 and 3.2 are from 3.x-stable which
 622                                 was branched quite some time after 3.0-release
 623 FreeBSD 2.2.8           1998-11-29 [FBD]
 624 OpenBSD 2.4             1998-12-01 [OBD]
 625 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
 626 FreeBSD 3.1             1999-02-15 [FBD]
 627 BSD/OS 4.0.1            1999-03-xx [BSDI]
 628 NetBSD 1.4              1999-05-12 [NBD]
 629 FreeBSD 3.2             1999-05-17 [FBD]
 630 OpenBSD 2.5             1999-05-19 [OBD]
 631 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
 632 FreeBSD 3.3             1999-09-17 [FBD]
 633 OpenBSD 2.6             1999-12-01 [OBD]
 634 FreeBSD 3.4             1999-12-20 [FBD]
 635 BSD/OS 4.1              1999-12-xx [BSDI]
 636 FreeBSD 4.0             2000-03-13 [FBD]
 637 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
 638 OpenBSD 2.7             2000-06-15 [OBD]
 639 FreeBSD 3.5             2000-06-24 [FBD]
 640 FreeBSD 4.1             2000-07-27 [FBD]
 641 FreeBSD 3.5.1           2000-07-28 [FBD]
 642 FreeBSD 4.1.1           2000-09-25 [FBD] (a network-only patch release)
 643 FreeBSD 4.2             2000-11-21 [FBD]
 644 NetBSD 1.4.3            2000-11-25 [NBD] (patch release)
 645 BSD/OS 4.2              2000-11-29 [BSDI]
 646 OpenBSD 2.8             2000-12-01 [OBD]
 647 NetBSD 1.5              2000-12-06 [NBD]
 648 Mac OS X 10.0           2001-03-24 [APL]
 649 FreeBSD 4.3             2001-04-20 [FBD]
 650 OpenBSD 2.9             2001-06-01 [OBD]
 651 NetBSD 1.5.1            2001-07-11 [NBD] (patch release)
 652 NetBSD 1.5.2            2001-09-13 [NBD] (patch release)
 653 FreeBSD 4.4             2001-09-18 [FBD]
 654 Mac OS X 10.1           2001-09-29 [APL]
 655 OpenBSD 3.0             2001-12-01 [OBD]
 656 FreeBSD 4.5             2002-01-29 [FBD]
 657 BSD/OS 4.3              2002-03-14 [WRS]
 658 OpenBSD 3.1             2002-05-19 [OBD]
 659 FreeBSD 4.6             2002-06-15 [FBD]
 660 NetBSD 1.5.3            2002-07-22 [NBD] (patch release)
 661 FreeBSD 4.6.2           2002-08-15 [FBD] (patch release)
 662 Mac OS X 10.2           2002-08-23 [APL]
 663 NetBSD 1.6              2002-09-14 [NBD]
 664 FreeBSD 4.7             2002-10-08 [FBD]
 665 OpenBSD 3.2             2002-11-01 [OBD]
 666 FreeBSD 5.0             2003-01-17 [FBD]
 667                                 FreeBSD 5.0 is a separate branch off of
 668                                 -current, similar to 3.0.
 669 FreeBSD 4.8             2003-04-03 [FBD]
 670 NetBSD 1.6.1            2003-04-21 [NBD] (patch release)
 671 OpenBSD 3.3             2003-05-01 [OBD]
 672 BSD/OS 5.0              2003-05-?? [WRS]
 673 FreeBSD 5.1             2003-06-09 [FBD]
 674 Mac OS X 10.3           2003-10-24 [APL]
 675 FreeBSD 4.9             2003-10-28 [FBD]
 676 BSD/OS 5.1 ISE          2003-10-?? [WRS] (final version)
 677 OpenBSD 3.4             2003-11-01 [OBD]
 678 FreeBSD 5.2             2004-01-12 [FBD]
 679 FreeBSD 5.2.1           2004-02-22 [FBD] (patch release)
 680 NetBSD 1.6.2            2004-03-01 [NBD] (patch release)
 681 OpenBSD 3.5             2004-04-01 [OBD]
 682 FreeBSD 4.10            2004-05-27 [FBD]
 683 DragonFly 1.0           2004-07-12 [DFB]
 684 OpenBSD 3.6             2004-10-29 [OBD]
 685 FreeBSD 5.3             2004-11-06 [FBD]
 686 NetBSD 2.0              2004-12-09 [NBD]
 687 FreeBSD 4.11            2005-01-25 [FBD]
 688 DragonFly 1.2.0         2005-04-08 [DFB]
 689 NetBSD 2.0.2            2005-04-14 [NBD] (security/critical release)
 690 Mac OS X 10.4           2005-04-29 [APL]
 691 FreeBSD 5.4             2005-05-09 [FBD]
 692 OpenBSD 3.7             2005-05-19 [OBD]
 693 NetBSD 2.0.3            2005-10-31 [NBD] (security/critical release)
 694 OpenBSD 3.8             2005-11-01 [OBD]
 695 FreeBSD 6.0             2005-11-01 [FBD]
 696 NetBSD 2.1              2005-11-02 [NBD]
 697 NetBSD 3.0              2005-12-23 [NBD]
 698 DragonFly 1.4.0         2006-01-08 [DFB]
 699 FreeBSD 2.2.9           2006-04-01 [FBD]
 700 OpenBSD 3.9             2006-05-01 [OBD]
 701 FreeBSD 6.1             2006-05-08 [FBD]
 702 FreeBSD 5.5             2006-05-25 [FBD]
 703 NetBSD 3.0.1            2006-07-24 [NBD] (security/critical release)
 704 DragonFly 1.6.0         2006-07-24 [DFB]
 705 OpenBSD 4.0             2006-11-01 [OBD]
 706 NetBSD 3.0.2            2006-11-04 [NBD] (security/critical release)
 707 NetBSD 3.1              2006-11-04 [NBD]
 708 FreeBSD 6.2             2007-01-15 [FBD]
 709 DragonFly 1.8.0         2007-01-30 [DFB]
 710 OpenBSD 4.1             2007-05-01 [OBD]
 711 DragonFly 1.10.0        2007-08-06 [DFB]
 712 Mac OS X 10.5           2007-10-26 [APL]
 713 OpenBSD 4.2             2007-11-01 [OBD]
 714 NetBSD 4.0              2007-12-19 [NBD]
 715 FreeBSD 6.3             2008-01-18 [FBD]
 716 DragonFly 1.12.0        2008-02-26 [DFB]
 717 FreeBSD 7.0             2008-02-27 [FBD]
 718 OpenBSD 4.3             2008-05-01 [OBD]
 719 DragonFly 2.0.0         2008-07-21 [DFB]
 720 OpenBSD 4.4             2008-11-01 [OBD]
 721 FreeBSD 6.4             2008-11-28 [FBD]
 722 FreeBSD 7.1             2009-01-04 [FBD]
 723 DragonFly 2.2.0         2009-02-17 [DFB]
 724 NetBSD 5.0              2009-04-29 [NBD]
 725 OpenBSD 4.5             2009-05-01 [OBD]
 726 FreeBSD 7.2             2009-05-04 [FBD]
 727 Mac OS X 10.6           2009-06-08 [APL]
 728 NetBSD 5.0.1            2009-08-02 [NBD] (security/critical release)
 729 DragonFly 2.4.0         2009-09-16 [DFB]
 730 OpenBSD 4.6             2009-10-18 [OBD]
 731 FreeBSD 8.0             2009-11-26 [FBD]
 732 NetBSD 5.0.2            2010-02-12 [NBD] (security/critical release)
 733 FreeBSD 7.3             2010-03-23 [FBD]
 734 DragonFly 2.6.0         2010-03-28 [DFB]
 735 OpenBSD 4.7             2010-05-19 [OBD]
 736 FreeBSD 8.1             2010-07-24 [FBD]
 737 DragonFly 2.8.2         2010-10-30 [DFB]
 738 OpenBSD 4.8             2010-11-01 [OBD]
 739 NetBSD 5.1              2010-11-19 [NBD]
 740 FreeBSD 7.4             2011-02-24 [FBD]
 741 FreeBSD 8.2             2011-02-24 [FBD]
 742 DragonFly 2.10.1        2011-04-26 [DFB]
 743 OpenBSD 4.9             2011-05-01 [OBD]
 744 Mac OS X 10.7           2011-07-20 [APL]
 745 OpenBSD 5.0             2011-11-01 [OBD]
 746 FreeBSD 9.0             2012-01-12 [FBD]
 747 NetBSD 5.1.2            2012-02-02 [NBD] (security/critical release)
 748 DragonFly 3.0.1         2012-02-21 [DFB]
 749 FreeBSD 8.3             2012-04-18 [FBD]
 750 OpenBSD 5.1             2012-05-01 [OBD]
 751 Mac OS X 10.8           2012-07-25 [APL]
 752 NetBSD 6.0              2012-10-17 [NBD]
 753 OpenBSD 5.2             2012-11-01 [OBD]
 754 DragonFly 3.2.1         2012-11-02 [DFB]
 755 NetBSD 5.2              2012-12-03 [NBD]
 756 NetBSD 6.0.1            2012-12-26 [NBD] (security/critical release)
 757 FreeBSD 9.1             2012-12-30 [FBD]
 758 DragonFly 3.4.1         2013-04-29 [DFB]
 759 OpenBSD 5.3             2013-05-01 [OBD]
 760 NetBSD 6.0.2            2013-05-18 [NBD] (security/critical release)
 761 NetBSD 6.1              2013-05-18 [NBD]
 762 FreeBSD 8.4             2013-06-07 [FBD]
 763 NetBSD 6.1.1            2013-08-22 [NBD]
 764 NetBSD 5.1.3            2013-09-29 [NBD]
 765 NetBSD 5.2.1            2013-09-29 [NBD]
 766 FreeBSD 9.2             2013-09-30 [FBD]
 767 NetBSD 6.0.3            2013-09-30 [NBD]
 768 NetBSD 6.1.2            2013-09-30 [NBD]
 769 Mac OS X 10.9           2013-10-22 [APL]
 770 OpenBSD 5.4             2013-11-01 [OBD]
 771 DragonFly 3.6.0         2013-11-25 [DFB]
 772 FreeBSD 10.0            2014-01-20 [FBD]
 773 NetBSD 5.1.4            2014-01-25 [NBD]
 774 NetBSD 5.2.2            2014-01-25 [NBD]
 775 NetBSD 6.0.4            2014-01-25 [NBD]
 776 NetBSD 6.1.3            2014-01-25 [NBD]
 777 DragonFly 3.6.1         2014-02-22 [DFB]
 778 DragonFly 3.6.2         2014-04-10 [DFB]
 779 NetBSD 6.0.5            2014-04-12 [NBD]
 780 NetBSD 6.1.4            2014-04-12 [NBD]
 781 OpenBSD 5.5             2014-05-01 [OBD]
 782 DragonFly 3.8.0         2014-06-04 [DFB]
 783 DragonFly 3.8.1         2014-06-16 [DFB]
 784 DragonFly 3.6.3         2014-06-17 [DFB]
 785 FreeBSD 9.3             2014-07-05 [FBD]
 786 DragonFly 3.8.2         2014-08-08 [DFB]
 787 NetBSD 6.0.6            2014-09-22 [NBD]
 788 NetBSD 6.1.5            2014-09-22 [NBD]
 789 Mac OS X 10.10          2014-10-16 [APL]
 790 OpenBSD 5.6             2014-11-01 [OBD]
 791 FreeBSD 10.1            2014-11-14 [FBD]
 792 DragonFly 4.0.1         2014-11-25 [DFB]
 793 DragonFly 4.0.2         2015-01-07 [DFB]
 794 DragonFly 4.0.3         2015-01-21 [DFB]
 795 DragonFly 4.0.4         2015-03-09 [DFB]
 796 DragonFly 4.0.5         2015-03-23 [DFB]
 797 OpenBSD 5.7             2015-05-01 [OBD]
 798 DragonFly 4.2.0         2015-06-29 [DFB]
 799 FreeBSD 10.2            2015-08-13 [FBD]
 800 NetBSD 7.0              2015-09-25 [NBD]
 801 OS X 10.11              2015-09-30 [APL]
 802 OpenBSD 5.8             2015-10-18 [OBD]
 803 DragonFly 4.4.1         2015-12-07 [DFB]
 804 OpenBSD 5.9             2016-03-29 [OBD]
 805 FreeBSD 10.3            2016-04-04 [FBD]
 806 NetBSD 7.0.1            2016-05-22 [NBD]
 807 DragonFly 4.6.0         2016-08-02 [DFB]
 808 OpenBSD 6.0             2016-09-01 [OBD]
 809 macOS 10.12             2016-09-20 [APL]
 810 FreeBSD 11.0            2016-10-10 [FBD]
 811 NetBSD 7.0.2            2016-10-21 [NBD]
 812 NetBSD 7.1              2017-03-11 [NBD]
 813 DragonFly 4.8.0         2017-03-27 [DFB]
 814 OpenBSD 6.1             2017-04-11 [OBD]
 815 FreeBSD 11.1            2017-07-26 [FBD]
 816 macOS 10.13             2017-09-25 [APL]
 817 FreeBSD 10.4            2017-10-03 [FBD]
 818 OpenBSD 6.2             2017-10-09 [OBD]
 819 DragonFly 5.0.0         2017-10-16 [DFB]
 820 DragonFly 5.0.1         2017-11-06 [DFB]
 821 DragonFly 5.0.2         2017-12-04 [DFB]
 822 NetBSD 7.1.1            2017-12-22 [NBD]
 823 NetBSD 7.1.2            2018-03-15 [NBD]
 824 OpenBSD 6.3             2018-04-02 [OBD]
 825 DragonFly 5.2.0         2018-04-10 [DFB]
 826 DragonFly 5.2.1         2018-05-20 [DFB]
 827 DragonFly 5.2.2         2018-06-18 [DFB]
 828 FreeBSD 11.2            2018-06-27 [FBD]
 829 NetBSD 8.0              2018-07-17 [NBD]
 830 NetBSD 7.2              2018-08-29 [NBD]
 831 macOS 10.14             2018-09-24 [APL]
 832 OpenBSD 6.4             2018-10-18 [OBD]
 833 DragonFly 5.4.0         2018-12-03 [DFB]
 834 FreeBSD 12.0            2018-12-11 [FBD]
 835 DragonFly 5.4.1         2018-12-24 [DFB]
 836 OpenBSD 6.5             2019-05-01 [OBD]
 837 NetBSD 8.1              2019-06-04 [NBD]
 838 DragonFly 5.6           2019-06-17 [DFB]
 839 DragonFly 5.6.1         2019-06-19 [DFB]
 840 FreeBSD 11.3            2019-07-09 [FBD]
 841 DragonFly 5.6.2         2019-08-11 [DFB]
 842 OpenBSD 6.6             2019-10-17 [OBD]
 843 macOS 10.15             2019-10-07 [APL]
 844 macOS 10.15.1           2019-10-29 [APL] (security/critical release)
 845 FreeBSD 12.1            2019-11-04 [FBD]
 846 NetBSD 9.0              2020-02-14 [NBD]
 847 DragonFly 5.8           2020-03-03 [DFB]
 848 DragonFly 5.6.3         2020-03-11 [DFB]
 849 NetBSD 8.2              2020-03-31 [NBD]
 850 DragonFly 5.8.1         2020-05-06 [DFB]
 851 OpenBSD 6.7             2020-05-19 [OBD]
 852 FreeBSD 11.4            2020-06-16 [FBD]
 853 DragonFly 5.8.2         2020-09-23 [DFB]
 854 DragonFly 5.8.3         2020-09-24 [DFB]
 855 OpenBSD 6.8             2020-10-18 [OBD]
 856 NetBSD 9.1              2020-10-18 [NBD]
 857 FreeBSD 12.2            2020-10-27 [FBD]
 858 macOS 11                2020-11-19 [APL]
 859 FreeBSD 13.0            2021-04-13 [FBD]
 860 OpenBSD 6.9             2021-05-01 [OBD]
 861 DragonFly 6.0           2021-05-08 [DFB]
 862 NetBSD 9.2              2021-05-12 [NBD]
 863 DragonFly 6.0.1         2021-10-12 [DFB]
 864 OpenBSD 7.0             2021-10-14 [OBD]
 865 macOS 12                2021-10-25 [APL]
 866 FreeBSD 12.3            2021-12-01 [FBD]
 867 DragonFly 6.2.1         2022-01-09 [DFB]
 868 OpenBSD 7.1             2022-04-21 [OBD]
 869 FreeBSD 13.1            2022-05-17 [FBD]
 870 DragonFly 6.2.2         2022-06-09 [DFB]
 871 NetBSD 9.3              2022-08-04 [NBD]
 872 OpenBSD 7.2             2022-10-20 [OBD]
 873 macOS 13                2022-10-24 [APL]
 874 FreeBSD 12.4            2022-12-05 [FBD]
 875 DragonFly 6.4           2022-12-30 [DFB]
 876 OpenBSD 7.3             2023-04-10 [OBD]
 877 FreeBSD 13.2            2023-04-11 [FBD]
 878 macOS 14                2023-09-26 [APL]
 879 OpenBSD 7.4             2023-10-16 [OBD]
 880
 881 Bibliography
 882 ------------------------
 883
 884 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
 885 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
 886 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
 887
 888 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
 889 Company, Inc., 1994. ISBN 0-201-54777-5
 890
 891 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
 892 Quarterman. The Design and Implementation of the 4.4BSD Operating
 893 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
 894
 895 McKusick, Marshall Kirk, George Neville-Neil. The Design and
 896 Implementation of the FreeBSD Operating System.
 897 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
 898
 899 McKusick, Marshall Kirk, George Neville-Neil, Robert Watson. The
 900 Design and Implementation of the FreeBSD Operating System, 2nd Edition.
 901 Pearson Education, Inc., 2014. ISBN 0-321-96897-2
 902
 903 Doug McIlroy. Research Unix Reader.
 904
 905 Michael G. Brown. The Role of BSD in the Development of Unix.
 906 Presented to the Tasmanian Unix Special Interest Group of the
 907 Australian Computer Society, Hobart, August 1993.
 908
 909 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
 910 URL: https://web.archive.org/web/20081230094857/http://www.byte.com/art/9410/sec8/art3.htm
 911
 912 Andreas Klemm, Lars Köller. If you're going to San Francisco ...
 913 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
 914
 915 FreeBSD Release Information
 916 URL: https://www.FreeBSD.org/releases/
 917
 918 FreeBSD Manual Pages
 919 URL: https://man.freebsd.org/cgi/man.cgi
 920
 921 UNIX history graphing project
 922 URL: https://minnie.tuhs.org/Unix_History/index.html
 923
 924 UNIX history
 925 URL: https://www.levenez.com/unix/
 926
 927 James Howard: The BSD Family Tree
 928 URL: https://web.archive.org/web/20090427195917/http://ezine.daemonnews.org/200104/bsd_family.html
 929 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
 930
 931
 932 Acknowledgments
 933 ---------------
 934
 935 Josh Gilliam for suggestions, bug fixes, and finding very old
 936 original BSD announcements from Usenet or tapes.
 937
 938 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
 939
 940 --
 941 Copyright (c) 1997-2023 Wolfram Schneider <wosch@FreeBSD.org>
 942 URL: https://cgit.freebsd.org/src/tree/share/misc/bsd-family-tree