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