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