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