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bsd-family-tree revision 1.75.2.2
      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  |     v              |      |   9.0     |        |                    |
    410  |                    |      |           |        |                    |
    411  |                    |      |           |        |            DragonFly 5.8
    412  |                    |      |           |        |                    |
    413  |                    |      |           |        |            DragonFly 5.6.3
    414  |                    |      |        NetBSD      |                    |
    415  |                    |      |         8.2        |                    |
    416  |                    |      |                    |                    |
    417 FreeBSD 13 -current   |  NetBSD -current   OpenBSD -current    DragonFly -current
    418  |                    |      |                    |                    |
    419  v                    v      v                    v                    v
    420 
    421 Time
    422 ----------------
    423 
    424 Time tolerance +/- 6 months, depending on which book/article you read; if it
    425 was the announcement in Usenet or if it was available as tape.
    426 
    427 [44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels,
    428 	and John Quarterman. The Design and Implementation of
    429 	the 4.4BSD Operating System.
    430 [APL] Apple website [https://www.apple.com/macosx/]
    431 [BSDI] Berkeley Software Design, Inc.
    432 [DFB] DragonFlyBSD Project, The.
    433 [DOC] README, COPYRIGHT on tape.
    434 [FBD] FreeBSD Project, The.
    435 [KB]  Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources,
    436 	Volume 11, Info 4, April, 1987.
    437 [KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement.
    438 	comp.bugs.4bsd.ucb-fixes, June 15, 1988.
    439 [KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz.
    440 	Changes in the Kernel in 2.9BSD. Second Berkeley Software
    441 	Distribution UNIX Version 2.9, July, 1983.
    442 [NBD] NetBSD Project, The.
    443 [OBD] OpenBSD Project, The.
    444 [QCU] Salus, Peter H. A quarter century of UNIX.
    445 [SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11.
    446 [TUHS] The Unix Historical Society.  http://minnie.tuhs.org/Unix_History/.
    447 [USE] Usenet announcement.
    448 [WRS] Wind River Systems, Inc.
    449 [dmr] Dennis Ritchie, via E-Mail
    450 
    451 Multics                 1965
    452 UNIX                    Summer 1969
    453 				DEC PDP-7
    454 First   Edition         1971-11-03 [QCU]
    455 				DEC PDP-11/20, Assembler
    456 Second  Edition         1972-06-12 [QCU]
    457 				10 UNIX installations
    458 Third   Edition         1973-02-xx [QCU]
    459 				Pipes, 16 installations
    460 Fourth  Edition         1973-11-xx [QCU]
    461 				rewriting in C effected,
    462                                 above 30 installations
    463 Fifth   Edition         1974-06-xx [QCU]
    464 				above 50 installations
    465 Sixth   Edition         1975-05-xx [QCU]
    466 				port to DEC Vax
    467 Seventh Edition         1979-01-xx [QCU] 1979-01-10 [TUHS]
    468 				first portable UNIX
    469 Eighth  Edition         1985-02-xx [QCU]
    470 				VAX 11/750, VAX 11/780 [dmr]
    471 				descended from 4.1c BSD [dmr]
    472 				descended from 4.1 BSD [44B]
    473 			scooping-out and replacement of the character-device
    474 			and networking part by the streams mechanism
    475 
    476 Ninth   Edition         1986-09-xx [QCU]
    477 Tenth   Edition         1989-10-xx [QCU]
    478 
    479 1BSD                    late 1977
    480 			1978-03-09 [QCU]
    481 				PDP-11, Pascal, ex(1)
    482 				30 free copies of 1BSD sent out
    483 				35 tapes sold for 50 USD [QCU]
    484 2BSD                    mid 1978 [QCU] 1979-05-10 [TUHS]
    485 				75 2BSD tapes shipped
    486 2.79BSD			1980-04-xx [TUHS]
    487 2.8BSD			1981-07-xx [KSJ]
    488 
    489 2.8.1BSD		1982-01-xx [QCU]
    490 				set of performance improvements
    491 2.9BSD			1983-07-xx [KSJ]
    492 2.9.1BSD                1983-11-xx [TUHS]
    493 2.9BSD-Seismo		1985-08-xx [SMS]
    494 2.10BSD			1987-04-xx [KKK]
    495 2.10.1BSD		1989-01-xx [SMS]
    496 2.11BSD			1992-02-xx [SMS]
    497 2.11BSD rev #430	1999-12-13 [SMS]
    498 
    499 32V			1978-1[01]-xx [QCU] 1979-03-26 [TUHS]
    500 3BSD                    late 1979 [QCU] March 1980 [TUHS]
    501 				virtual memory, page replacement,
    502                         	demand paging
    503 4.0BSD                  1980-10-xx
    504 4.1BSD                  1981-07-08 [DOC]
    505 4.1aBSD                 1982-04-xx
    506 				alpha release, 100 sites, networking [44B]
    507 4.1bBSD				internal release, fast filesystem [44B]
    508 4.1cBSD                 late 1982
    509 				beta release, IPC [44B]
    510 4.2BSD                  1983-09-xx [QCU]
    511                         1983-08-03 [DOC]
    512 4.3BSD                  1986-06-xx [QCU]
    513 			1986-04-05 [KB], [DOC]
    514 4.3BSD Tahoe            1988-06-15 [QCU], [DOC]
    515 4.3BSD NET/1            1988-11-xx [QCU]
    516                         1989-01-01 [DOC]
    517 4.3BSD Reno             1990-06-29 [QCU], [DOC]
    518 4.3BSD NET/2            1991-06-28 [QCU], [DOC]
    519 
    520 BSD/386 ALPHA		1991-12-xx [BSDI]
    521 				first code released to people outside BSDI
    522 386BSD 0.0              1992-02-xx [DOC]
    523 BSD/386 0.3.1	        1992-04-xx [BSDI] first ext. beta; B customers
    524 BSD/386 0.3.3		1992-06-xx [BSDI] first CDROM version
    525 386BSD 0.1              1992-07-28 [DOC]
    526 4.4BSD Alpha            1992-07-07
    527 BSD/386 0.9.3		1992-10-xx [BSDI]
    528 				first external gamma; G customers
    529 BSD/386 0.9.4		1992-12-xx [BSDI]
    530 				would have been 1.0 except for request
    531 				for preliminary injunction
    532 BSD/386 1.0 		1993-03-xx [BSDI]
    533 				injunction denied; first official release
    534 NetBSD 0.8              1993-04-20 [NBD]
    535 4.4BSD                  1993-06-01 [USE]
    536 NetBSD 0.9              1993-08-23 [NBD]
    537 FreeBSD 1.0		1993-11-01 [FBD]
    538 FreeBSD 1.0.2		1993-11-14 [FBD]
    539 				supersedes 1.0 13 days after release.
    540 BSD/386 1.1		1994-02-xx [BSDI]
    541 4.4BSD Lite             1994-03-01 [USE]
    542 FreeBSD 1.1		1994-05-07 [FBD]
    543 FreeBSD 1.1.5		1994-06-30 [FBD]
    544 FreeBSD 1.1.5.1		1994-07-05 [FBD]
    545 				supersedes 1.1.5 5 days after release.
    546 NetBSD 1.0              1994-10-26 [NBD]
    547 386BSD 1.0              1994-11-12 [USE]
    548 FreeBSD 2.0		1994-11-23 [FBD]
    549 BSD/OS 2.0		1995-01-xx [BSDI] 4.4 lite based
    550 FreeBSD 2.0.5		1995-06-10 [FBD]
    551 BSD/OS 2.0.1		1995-06-xx [BSDI]
    552 4.4BSD Lite Release 2	1995-06-xx [44B]
    553 				the true final distribution from the CSRG
    554 FreeBSD 2.1.0		1995-11-19 [FBD]
    555 NetBSD 1.1              1995-11-26 [NBD]
    556 BSD/OS 2.1		1996-01-xx [BSDI]
    557 FreeBSD 2.1.5		1996-07-14 [FBD]
    558 NetBSD 1.2              1996-10-04 [NBD]
    559 OpenBSD 2.0             1996-10-18 [OBD]
    560 FreeBSD 2.1.6		1996-11-16 [FBD]
    561 FreeBSD 2.1.6.1		1996-11-25 [FBD] (sendmail security release)
    562 Rhapsody		1997-xx-xx
    563 FreeBSD 2.1.7		1997-02-20 [FBD]
    564 BSD/OS 3.0		1997-02-xx [BSDI] 4.4 lite2 based
    565 FreeBSD 2.2.0		1997-03-16 [FBD]
    566 FreeBSD 2.2.1		1997-03-25 [FBD]
    567 FreeBSD 2.2.2		1997-05-16 [FBD]
    568 NetBSD 1.2.1            1997-05-20 [NBD] (patch release)
    569 OpenBSD 2.1             1997-06-01 [OBD]
    570 FreeBSD 2.2.5		1997-10-22 [FBD]
    571 OpenBSD 2.2             1997-12-01 [OBD]
    572 NetBSD 1.3              1998-01-04 [NBD]
    573 FreeBSD 2.2.6		1998-03-25 [FBD]
    574 NetBSD 1.3.1            1998-03-09 [NBD] (patch release)
    575 BSD/OS 3.1		1998-03-xx [BSDI]
    576 OpenBSD 2.3             1998-05-19 [OBD]
    577 NetBSD 1.3.2            1998-05-29 [NBD] (patch release)
    578 FreeBSD 2.2.7		1998-07-22 [FBD]
    579 BSD/OS 4.0		1998-08-xx [BSDI]
    580 				2-lock MP support, ELF executables
    581 FreeBSD 3.0		1998-10-16 [FBD]
    582 				FreeBSD-3.0 is a snapshot from -current,
    583 				while 3.1 and 3.2 are from 3.x-stable which
    584 				was branched quite some time after 3.0-release
    585 FreeBSD 2.2.8           1998-11-29 [FBD]
    586 OpenBSD 2.4             1998-12-01 [OBD]
    587 NetBSD 1.3.3            1998-12-23 [NBD] (patch release)
    588 FreeBSD 3.1		1999-02-15 [FBD]
    589 BSD/OS 4.0.1		1999-03-xx [BSDI]
    590 NetBSD 1.4              1999-05-12 [NBD]
    591 FreeBSD 3.2             1999-05-17 [FBD]
    592 OpenBSD 2.5             1999-05-19 [OBD]
    593 NetBSD 1.4.1            1999-08-26 [NBD] (patch release)
    594 FreeBSD 3.3             1999-09-17 [FBD]
    595 OpenBSD 2.6             1999-12-01 [OBD]
    596 FreeBSD 3.4             1999-12-20 [FBD]
    597 BSD/OS 4.1		1999-12-xx [BSDI]
    598 FreeBSD 4.0             2000-03-13 [FBD]
    599 NetBSD 1.4.2            2000-03-19 [NBD] (patch release)
    600 OpenBSD 2.7             2000-06-15 [OBD]
    601 FreeBSD 3.5		2000-06-24 [FBD]
    602 FreeBSD 4.1		2000-07-27 [FBD]
    603 FreeBSD 3.5.1		2000-07-28 [FBD]
    604 FreeBSD 4.1.1		2000-09-25 [FBD] (a network-only patch release)
    605 FreeBSD 4.2  		2000-11-21 [FBD]
    606 NetBSD 1.4.3		2000-11-25 [NBD] (patch release)
    607 BSD/OS 4.2		2000-11-29 [BSDI]
    608 OpenBSD 2.8		2000-12-01 [OBD]
    609 NetBSD 1.5              2000-12-06 [NBD]
    610 Mac OS X 10.0           2001-03-24 [APL]
    611 FreeBSD 4.3  		2001-04-20 [FBD]
    612 OpenBSD 2.9  		2001-06-01 [OBD]
    613 NetBSD 1.5.1		2001-07-11 [NBD] (patch release)
    614 NetBSD 1.5.2		2001-09-13 [NBD] (patch release)
    615 FreeBSD 4.4  		2001-09-18 [FBD]
    616 Mac OS X 10.1		2001-09-29 [APL]
    617 OpenBSD 3.0		2001-12-01 [OBD]
    618 FreeBSD 4.5  		2002-01-29 [FBD]
    619 BSD/OS 4.3		2002-03-14 [WRS]
    620 OpenBSD 3.1		2002-05-19 [OBD]
    621 FreeBSD 4.6  		2002-06-15 [FBD]
    622 NetBSD 1.5.3		2002-07-22 [NBD] (patch release)
    623 FreeBSD 4.6.2		2002-08-15 [FBD] (patch release)
    624 Mac OS X 10.2		2002-08-23 [APL]
    625 NetBSD 1.6		2002-09-14 [NBD]
    626 FreeBSD 4.7		2002-10-08 [FBD]
    627 OpenBSD 3.2		2002-11-01 [OBD]
    628 FreeBSD 5.0		2003-01-17 [FBD]
    629 				FreeBSD 5.0 is a separate branch off of
    630 				-current, similar to 3.0.
    631 FreeBSD 4.8		2003-04-03 [FBD]
    632 NetBSD 1.6.1		2003-04-21 [NBD] (patch release)
    633 OpenBSD 3.3		2003-05-01 [OBD]
    634 BSD/OS 5.0		2003-05-?? [WRS]
    635 FreeBSD 5.1		2003-06-09 [FBD]
    636 Mac OS X 10.3		2003-10-24 [APL]
    637 FreeBSD 4.9		2003-10-28 [FBD]
    638 BSD/OS 5.1 ISE		2003-10-?? [WRS] (final version)
    639 OpenBSD 3.4		2003-11-01 [OBD]
    640 FreeBSD 5.2		2004-01-12 [FBD]
    641 FreeBSD 5.2.1		2004-02-22 [FBD] (patch release)
    642 NetBSD 1.6.2		2004-03-01 [NBD] (patch release)
    643 OpenBSD 3.5		2004-04-01 [OBD]
    644 FreeBSD 4.10		2004-05-27 [FBD]
    645 DragonFly 1.0		2004-07-12 [DFB]
    646 OpenBSD 3.6		2004-10-29 [OBD]
    647 FreeBSD 5.3		2004-11-06 [FBD]
    648 NetBSD 2.0		2004-12-09 [NBD]
    649 FreeBSD 4.11		2005-01-25 [FBD]
    650 DragonFly 1.2.0		2005-04-08 [DFB]
    651 NetBSD 2.0.2		2005-04-14 [NBD] (security/critical release)
    652 Mac OS X 10.4		2005-04-29 [APL]
    653 FreeBSD 5.4		2005-05-09 [FBD]
    654 OpenBSD 3.7		2005-05-19 [OBD]
    655 NetBSD 2.0.3		2005-10-31 [NBD] (security/critical release)
    656 OpenBSD 3.8		2005-11-01 [OBD]
    657 FreeBSD 6.0		2005-11-01 [FBD]
    658 NetBSD 2.1		2005-11-02 [NBD]
    659 NetBSD 3.0		2005-12-23 [NBD]
    660 DragonFly 1.4.0		2006-01-08 [DFB]
    661 FreeBSD 2.2.9		2006-04-01 [FBD]
    662 OpenBSD 3.9		2006-05-01 [OBD]
    663 FreeBSD 6.1		2006-05-08 [FBD]
    664 FreeBSD 5.5		2006-05-25 [FBD]
    665 NetBSD 3.0.1		2006-07-24 [NBD] (security/critical release)
    666 DragonFly 1.6.0		2006-07-24 [DFB]
    667 OpenBSD 4.0		2006-11-01 [OBD]
    668 NetBSD 3.0.2		2006-11-04 [NBD] (security/critical release)
    669 NetBSD 3.1		2006-11-04 [NBD]
    670 FreeBSD 6.2		2007-01-15 [FBD]
    671 DragonFly 1.8.0		2007-01-30 [DFB]
    672 OpenBSD 4.1		2007-05-01 [OBD]
    673 DragonFly 1.10.0	2007-08-06 [DFB]
    674 Mac OS X 10.5		2007-10-26 [APL]
    675 OpenBSD 4.2		2007-11-01 [OBD]
    676 NetBSD 4.0		2007-12-19 [NBD]
    677 FreeBSD 6.3		2008-01-18 [FBD]
    678 DragonFly 1.12.0	2008-02-26 [DFB]
    679 FreeBSD 7.0		2008-02-27 [FBD]
    680 OpenBSD 4.3		2008-05-01 [OBD]
    681 DragonFly 2.0.0		2008-07-21 [DFB]
    682 OpenBSD 4.4		2008-11-01 [OBD]
    683 FreeBSD 6.4		2008-11-28 [FBD]
    684 FreeBSD 7.1		2009-01-04 [FBD]
    685 DragonFly 2.2.0		2009-02-17 [DFB]
    686 NetBSD 5.0		2009-04-29 [NBD]
    687 OpenBSD 4.5		2009-05-01 [OBD]
    688 FreeBSD 7.2		2009-05-04 [FBD]
    689 Mac OS X 10.6		2009-06-08 [APL]
    690 NetBSD 5.0.1		2009-08-02 [NBD] (security/critical release)
    691 DragonFly 2.4.0		2009-09-16 [DFB]
    692 OpenBSD 4.6		2009-10-18 [OBD]
    693 FreeBSD 8.0		2009-11-26 [FBD]
    694 NetBSD 5.0.2		2010-02-12 [NBD] (security/critical release)
    695 FreeBSD 7.3		2010-03-23 [FBD]
    696 DragonFly 2.6.0		2010-03-28 [DFB]
    697 OpenBSD 4.7		2010-05-19 [OBD]
    698 FreeBSD 8.1		2010-07-24 [FBD]
    699 DragonFly 2.8.2		2010-10-30 [DFB]
    700 OpenBSD 4.8		2010-11-01 [OBD]
    701 NetBSD 5.1		2010-11-19 [NBD]
    702 FreeBSD 7.4		2011-02-24 [FBD]
    703 FreeBSD 8.2		2011-02-24 [FBD]
    704 DragonFly 2.10.1	2011-04-26 [DFB]
    705 OpenBSD 4.9		2011-05-01 [OBD]
    706 Mac OS X 10.7		2011-07-20 [APL]
    707 OpenBSD 5.0		2011-11-01 [OBD]
    708 FreeBSD 9.0		2012-01-12 [FBD]
    709 NetBSD 5.1.2		2012-02-02 [NBD] (security/critical release)
    710 DragonFly 3.0.1		2012-02-21 [DFB]
    711 FreeBSD 8.3		2012-04-18 [FBD]
    712 OpenBSD 5.1		2012-05-01 [OBD]
    713 Mac OS X 10.8		2012-07-25 [APL]
    714 NetBSD 6.0		2012-10-17 [NBD]
    715 OpenBSD 5.2		2012-11-01 [OBD]
    716 DragonFly 3.2.1		2012-11-02 [DFB]
    717 NetBSD 5.2		2012-12-03 [NBD]
    718 NetBSD 6.0.1		2012-12-26 [NBD] (security/critical release)
    719 FreeBSD 9.1		2012-12-30 [FBD]
    720 DragonFly 3.4.1		2013-04-29 [DFB]
    721 OpenBSD 5.3		2013-05-01 [OBD]
    722 NetBSD 6.0.2		2013-05-18 [NBD] (security/critical release)
    723 NetBSD 6.1		2013-05-18 [NBD]
    724 FreeBSD 8.4		2013-06-07 [FBD]
    725 NetBSD 6.1.1		2013-08-22 [NBD]
    726 NetBSD 5.1.3		2013-09-29 [NBD]
    727 NetBSD 5.2.1		2013-09-29 [NBD]
    728 FreeBSD 9.2		2013-09-30 [FBD]
    729 NetBSD 6.0.3		2013-09-30 [NBD]
    730 NetBSD 6.1.2		2013-09-30 [NBD]
    731 Mac OS X 10.9		2013-10-22 [APL]
    732 OpenBSD 5.4		2013-11-01 [OBD]
    733 DragonFly 3.6.0 	2013-11-25 [DFB]
    734 FreeBSD 10.0		2014-01-20 [FBD]
    735 NetBSD 5.1.4		2014-01-25 [NBD]
    736 NetBSD 5.2.2		2014-01-25 [NBD]
    737 NetBSD 6.0.4		2014-01-25 [NBD]
    738 NetBSD 6.1.3		2014-01-25 [NBD]
    739 DragonFly 3.6.1 	2014-02-22 [DFB]
    740 DragonFly 3.6.2		2014-04-10 [DFB]
    741 NetBSD 6.0.5		2014-04-12 [NBD]
    742 NetBSD 6.1.4		2014-04-12 [NBD]
    743 OpenBSD 5.5		2014-05-01 [OBD]
    744 DragonFly 3.8.0		2014-06-04 [DFB]
    745 DragonFly 3.8.1		2014-06-16 [DFB]
    746 DragonFly 3.6.3		2014-06-17 [DFB]
    747 FreeBSD 9.3		2014-07-05 [FBD]
    748 DragonFly 3.8.2		2014-08-08 [DFB]
    749 NetBSD 6.0.6		2014-09-22 [NBD]
    750 NetBSD 6.1.5		2014-09-22 [NBD]
    751 Mac OS X 10.10		2014-10-16 [APL]
    752 OpenBSD 5.6		2014-11-01 [OBD]
    753 FreeBSD 10.1		2014-11-14 [FBD]
    754 DragonFly 4.0.1		2014-11-25 [DFB]
    755 DragonFly 4.0.2		2015-01-07 [DFB]
    756 DragonFly 4.0.3		2015-01-21 [DFB]
    757 DragonFly 4.0.4		2015-03-09 [DFB]
    758 DragonFly 4.0.5		2015-03-23 [DFB]
    759 OpenBSD 5.7		2015-05-01 [OBD]
    760 DragonFly 4.2.0		2015-06-29 [DFB]
    761 FreeBSD 10.2            2015-08-13 [FBD]
    762 NetBSD 7.0		2015-09-25 [NBD]
    763 OS X 10.11		2015-09-30 [APL]
    764 OpenBSD 5.8		2015-10-18 [OBD]
    765 DragonFly 4.4.1		2015-12-07 [DFB]
    766 OpenBSD 5.9		2016-03-29 [OBD]
    767 FreeBSD 10.3		2016-04-04 [FBD]
    768 NetBSD 7.0.1		2016-05-22 [NBD]
    769 DragonFly 4.6.0		2016-08-02 [DFB]
    770 OpenBSD 6.0		2016-09-01 [OBD]
    771 macOS 10.12		2016-09-20 [APL]
    772 FreeBSD 11.0		2016-10-10 [FBD]
    773 NetBSD 7.0.2		2016-10-21 [NBD]
    774 NetBSD 7.1		2017-03-11 [NBD]
    775 DragonFly 4.8.0		2017-03-27 [DFB]
    776 OpenBSD 6.1		2017-04-11 [OBD]
    777 FreeBSD 11.1		2017-07-26 [FBD]
    778 macOS 10.13		2017-09-25 [APL]
    779 FreeBSD 10.4		2017-10-03 [FBD]
    780 OpenBSD 6.2		2017-10-09 [OBD]
    781 DragonFly 5.0.0		2017-10-16 [DFB]
    782 DragonFly 5.0.1		2017-11-06 [DFB]
    783 DragonFly 5.0.2		2017-12-04 [DFB]
    784 NetBSD 7.1.1		2017-12-22 [NBD]
    785 NetBSD 7.1.2		2018-03-15 [NBD]
    786 OpenBSD 6.3		2018-04-02 [OBD]
    787 DragonFly 5.2.0		2018-04-10 [DFB]
    788 DragonFly 5.2.1		2018-05-20 [DFB]
    789 DragonFly 5.2.2		2018-06-18 [DFB]
    790 FreeBSD 11.2		2018-06-27 [FBD]
    791 NetBSD 8.0		2018-07-17 [NBD]
    792 NetBSD 7.2		2018-08-29 [NBD]
    793 macOS 10.14		2018-09-24 [APL]
    794 OpenBSD 6.4		2018-10-18 [OBD]
    795 DragonFly 5.4.0		2018-12-03 [DFB]
    796 FreeBSD 12.0		2018-12-11 [FBD]
    797 DragonFly 5.4.1		2018-12-24 [DFB]
    798 OpenBSD 6.5		2019-05-01 [OBD]
    799 NetBSD 8.1		2019-06-04 [NBD]
    800 DragonFly 5.6		2019-06-17 [DFB]
    801 DragonFly 5.6.1		2019-06-19 [DFB]
    802 FreeBSD 11.3		2019-07-09 [FBD]
    803 DragonFly 5.6.2		2019-08-11 [DFB]
    804 OpenBSD 6.6		2019-10-17 [OBD]
    805 macOS 10.15		2019-10-07 [APL]
    806 macOS 10.15.1		2019-10-29 [APL] (security/critical release)
    807 FreeBSD 12.1		2019-11-04 [FBD]
    808 NetBSD 9.0 		2020-02-14 [NBD]
    809 DragonFly 5.8 		2020-03-03 [DFB]
    810 DragonFly 5.6.3 	2020-03-11 [DFB]
    811 NetBSD 8.2 		2020-03-31 [NBD]
    812 
    813 Bibliography
    814 ------------------------
    815 
    816 Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John
    817 Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating
    818 System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1
    819 
    820 Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing
    821 Company, Inc., 1994. ISBN 0-201-54777-5
    822 
    823 McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John
    824 Quarterman. The Design and Implementation of the 4.4BSD Operating
    825 System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4
    826 
    827 McKusick, Marshall Kirk, George Neville-Neil. The Design and
    828 Implementation of the FreeBSD Operating System.
    829 Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2
    830 
    831 McKusick, Marshall Kirk, George Neville-Neil, Robert Watson. The
    832 Design and Implementation of the FreeBSD Operating System, 2nd Edition.
    833 Pearson Education, Inc., 2014. ISBN 0-321-96897-2
    834 
    835 Doug McIlroy. Research Unix Reader.
    836 
    837 Michael G. Brown. The Role of BSD in the Development of Unix.
    838 Presented to the Tasmanian Unix Special Interest Group of the
    839 Australian Computer Society, Hobart, August 1993.
    840 
    841 Peter H. Salus. Unix at 25. Byte Magazine, October 1994.
    842 URL: http://www.byte.com/art/9410/sec8/art3.htm
    843 
    844 Andreas Klemm, Lars Kller. If you're going to San Francisco ...
    845 Die freien BSD-Varianten von Unix. c't April 1997, page 368ff.
    846 
    847 BSD Release Announcements collection.
    848 URL: https://www.FreeBSD.org/releases/
    849 
    850 BSD Hypertext Man Pages
    851 URL: https://www.FreeBSD.org/cgi/man.cgi
    852 
    853 UNIX history graphing project
    854 URL: http://minnie.tuhs.org/Unix_History/index.html
    855 
    856 UNIX history
    857 URL: http://www.levenez.com/unix/
    858 
    859 James Howard: The BSD Family Tree
    860 URL: http://ezine.daemonnews.org/200104/bsd_family.html
    861 ("what are the differences between FreeBSD, NetBSD, and OpenBSD?")
    862 
    863 
    864 Acknowledgments
    865 ---------------
    866 
    867 Josh Gilliam for suggestions, bug fixes, and finding very old
    868 original BSD announcements from Usenet or tapes.
    869 
    870 Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages.
    871 
    872 --
    873 Copyright (c) 1997-2012 Wolfram Schneider <wosch (a] FreeBSD.ORG>
    874 URL: https://svnweb.freebsd.org/base/head/share/misc/bsd-family-tree
    875 
    876 $FreeBSD: head/share/misc/bsd-family-tree 359561 2020-04-02 11:08:19Z sevan $
    877 $NetBSD: bsd-family-tree,v 1.75.2.2 2020/04/28 18:06:24 martin Exp $
    878