bsd-family-tree revision 166362
1The UNIX system family tree: Research and BSD 2--------------------------------------------- 3 4First Edition (V1) 5 | 6Second Edition (V2) 7 | 8Third Edition (V3) 9 | 10Fourth Edition (V4) 11 | 12Fifth Edition (V5) 13 | 14Sixth Edition (V6) -----* 15 \ | 16 \ | 17 \ | 18Seventh Edition (V7) | 19 \ | 20 \ 1BSD 21 32V | 22 \ 2BSD---------------* 23 \ / | 24 \ / | 25 \/ | 26 3BSD | 27 | | 28 4.0BSD 2.7.9BSD 29 | | 30 4.1BSD --------------> 2.8BSD 31 | | 32 4.1aBSD -----------\ | 33 | \ | 34 4.1bBSD \ | 35 | \ | 36 *------ 4.1cBSD --------------> 2.9BSD 37 / | | 38Eighth Edition | 2.9BSD-Seismo 39 | | | 40 +----<--- 4.2BSD 2.9.1BSD 41 | | | 42 +----<--- 4.3BSD -------------> 2.10BSD 43 | | / | 44Ninth Edition | / 2.10.1BSD 45 | 4.3BSD Tahoe-----+ | 46 | | \ | 47 | | \ | 48 v | 2.11BSD 49Tenth Edition | | 50 | 2.11BSD rev #430 51 4.3BSD NET/1 | 52 | v 53 4.3BSD Reno 54 | 55 *---------- 4.3BSD NET/2 -------------------+-------------* 56 | | | | 57386BSD 0.0 | | BSD/386 ALPHA 58 | | | | 59386BSD 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 | | | | 67FreeBSD 1.0 NetBSD 0.9 | BSD/386 1.1 68 | | .----- 4.4BSD Lite | 69FreeBSD 1.1 | / / | \ | 70 | | / / | \ | 71FreeBSD 1.1.5 .---|--------' / | \ | 72 | / | / | \ | 73FreeBSD 1.1.5.1 / | / | \ | 74 | / NetBSD 1.0 <-' | \ | 75 | / | | \ | 76FreeBSD 2.0 <--' | | BSD/OS 2.0 77 | \ | | 78FreeBSD 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 | 85FreeBSD 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 | v | | | | | | 114 | FreeBSD 2.2.8 | | | | | | 115 | | | | | OpenBSD 2.4 | 116FreeBSD 3.0 <--------* | | v | | 117 | | | NetBSD 1.3.3 | | 118 *---FreeBSD 3.1 | | | | 119 | | | | | BSD/OS 4.0.1 120 | FreeBSD 3.2----* | NetBSD 1.4 OpenBSD 2.5 | 121 | | | | | | | | | 122 | | | | | | | | | 123 | | | | | | | | | 124 | FreeBSD 3.3 | | | | NetBSD 1.4.1 | | 125 | | | | | | | OpenBSD 2.6 | 126 | FreeBSD 3.4 | | | | | | | 127 | | | | | | | | BSD/OS 4.1 128FreeBSD 4.0 | | | | | NetBSD 1.4.2 | | 129 | | | | | | | | | 130 | | | | | | | | | 131 | FreeBSD 3.5 | | | | | OpenBSD 2.7 | 132 | | | | | | | | | 133 | FreeBSD 3.5.1 | | | | | | | 134 | | | | | | | | 135 *---FreeBSD 4.1 | | | | | | | 136 | | | | (?) | | | | 137 | FreeBSD 4.1.1 | | / | | | | 138 | | | | / | | | | 139 | FreeBSD 4.2 Darwin/ | NetBSD 1.4.3 | | 140 | | Mac OS X | OpenBSD 2.8 BSD/OS 4.2 141 | | | | | | 142 | | | | | | 143 | | 10.0 NetBSD 1.5 | | 144 | FreeBSD 4.3 | | | | | 145 | | | | | OpenBSD 2.9 | 146 | | | | NetBSD 1.5.1 | | 147 | | | | | | | 148 | FreeBSD 4.4-. | | NetBSD 1.5.2 | | 149 | | | Mac OS X | | | | 150 | | | 10.1 | | OpenBSD 3.0 | 151 | FreeBSD 4.5 | | | | | | 152 | | \ | | | | BSD/OS 4.3 153 | FreeBSD 4.6 \ | | | OpenBSD 3.1 | 154 | | \ | | NetBSD 1.5.3 | | 155 | FreeBSD 4.6.2 Mac OS X | | | 156 | | 10.2 | | | 157 | FreeBSD 4.7 | | | | 158 | | | NetBSD 1.6 OpenBSD 3.2 | 159 | FreeBSD 4.8 | | | | | 160 | | | | NetBSD 1.6.1 | | 161 | |--------. | | | OpenBSD 3.3 BSD/OS 5.0 162 | | \ | | | | | 163 | FreeBSD 4.9 | | | | OpenBSD 3.4 BSD/OS 5.1 ISE 164 | | | | | | | 165 | | | | | NetBSD 1.6.2 | 166 | | | | | | | 167 | | | | | | OpenBSD 3.5 168 | | | | | v | 169 | FreeBSD 4.10 | | | | 170 | | | | | | 171 | FreeBSD 4.11 | | | | 172 | | | | | | 173 | v `-|------|-----------------|---------------------. 174 | | | | \ 175FreeBSD 5.0 | | | | 176 | | | | | 177FreeBSD 5.1 | | | DragonFly 1.0 178 | \ | | | | 179 | ----- Mac OS X | | | 180 | 10.3 | | | 181FreeBSD 5.2 | | | | 182 | | | | | | 183 | FreeBSD 5.2.1 | | | | 184 | | | | | 185 *-------FreeBSD 5.3 | | | | 186 | | | | OpenBSD 3.6 | 187 | | | NetBSD 2.0 | | 188 | | | | | | | DragonFly 1.2.0 189 | | Mac OS X | | NetBSD 2.0.2 | | 190 | | 10.4 | | | | | 191 | FreeBSD 5.4 | | | | | | 192 | | | | | | OpenBSD 3.7 | 193 | | | | | NetBSD 2.0.3 | | 194 | | | | | | | | 195 *--FreeBSD | | | | v OpenBSD 3.8 | 196 | 6.0 | | | | | | 197 | | | | | \ | | 198 | | | | | NetBSD 2.1 | | 199 | | | | | | | 200 | | | | NetBSD 3.0 | | 201 | | | | | | | | DragonFly 1.4.0 202 | | | | | | | OpenBSD 3.9 | 203 | FreeBSD | | | | | | | 204 | 6.1 | | | | | | | 205 | | FreeBSD 5.5 | | | | | | 206 | | | | | NetBSD 3.0.1 | DragonFly 1.6.0 207 | | | | | | | | 208 | | | | | | OpenBSD 4.0 | 209 | | | | | NetBSD 3.0.2 | | 210 | | | | NetBSD 3.1 | | 211 | FreeBSD 6.2 | | | | 212 | | | | | DragonFly 1.8.0 213 | V | | | | 214FreeBSD 7 -current | NetBSD -current OpenBSD -current | 215 | | | | | 216 v v v v v 217 218Time 219---------------- 220 221Time tolerance +/- 6 months, depending on which book/article you read; if it 222was the announcement in Usenet or if it was available as tape. 223 224[44B] McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, 225 and John Quarterman. The Design and Implementation of 226 the 4.4BSD Operating System. 227[APL] Apple website [http://www.apple.com/macosx/] 228[BSDI] Berkeley Software Design, Inc. 229[DFB] DragonFlyBSD Project, The. 230[DOC] README, COPYRIGHT on tape. 231[FBD] FreeBSD Project, The. 232[KB] Keith Bostic. BSD2.10 available from Usenix. comp.unix.sources, 233 Volume 11, Info 4, April, 1987. 234[KKK] Mike Karels, Kirk McKusick, and Keith Bostic. tahoe announcement. 235 comp.bugs.4bsd.ucb-fixes, June 15, 1988. 236[KSJ] Michael J. Karels, Carl F. Smith, and William F. Jolitz. 237 Changes in the Kernel in 2.9BSD. Second Berkeley Software 238 Distribution UNIX Version 2.9, July, 1983. 239[NBD] NetBSD Project, The. 240[OBD] OpenBSD Project, The. 241[QCU] Salus, Peter H. A quarter century of UNIX. 242[SMS] Steven M. Schultz. 2.11BSD, UNIX for the PDP-11. 243[USE] Usenet announcement. 244[WRS] Wind River Systems, Inc. 245[dmr] Dennis Ritchie, via E-Mail 246 247Multics 1965 248UNIX Summer 1969 249 DEC PDP-7 250First Edition 1971-11-03 [QCU] 251 DEC PDP-11/20, Assembler 252Second Edition 1972-06-12 [QCU] 253 10 UNIX installations 254Third Edition 1973-02-xx [QCU] 255 Pipes, 16 installations 256Fourth Edition 1973-11-xx [QCU] 257 rewriting in C effected, 258 above 30 installations 259Fifth Edition 1974-06-xx [QCU] 260 above 50 installations 261Sixth Edition 1975-05-xx [QCU] 262 port to DEC Vax 263Seventh Edition 1979-01-xx [QCU] 264 first portable UNIX 265Eighth Edition 1985-02-xx [QCU] 266 VAX 11/750, VAX 11/780 [dmr] 267 descended from 4.1c BSD [dmr] 268 descended from 4.1 BSD [44B] 269 scooping-out and replacement of the character-device 270 and networking part by the streams mechanism 271 272Ninth Edition 1986-09-xx [QCU] 273Tenth Edition 1989-10-xx [QCU] 274 2751BSD late 1977 276 1978-03-09 [QCU] 277 PDP-11, Pascal, ex(1) 278 30 free copies of 1BSD sent out 279 35 tapes sold for 50 USD [QCU] 2802BSD mid 1978 [QCU] 281 75 2BSD tapes shipped 2822.7.9BSD ?? [SMS] 2832.8BSD 1981-07-xx [KSJ] 284 2852.8.1BSD 1982-01-xx [QCU] 286 set of performance improvements 2872.9BSD 1983-07-xx [KSJ] 2882.9.1BSD 1983-11-xx 2892.9BSD-Seismo 1985-08-xx [SMS] 2902.10BSD 1987-04-xx [KKK] 2912.10.1BSD 1989-01-xx [SMS] 2922.11BSD 1992-02-xx [SMS] 2932.11BSD rev #430 1999-12-13 [SMS] 294 29532V 1978-1[01]-xx [QCU] 2963BSD late 1979 [QCU] 297 virtual memory, page replacement, 298 demand paging 2994.0BSD 1980-10-xx 3004.1BSD 1981-07-08 [DOC] 3014.1aBSD 1982-04-xx 302 alpha release, 100 sites, networking [44B] 3034.1bBSD internal release, fast filesystem [44B] 3044.1cBSD late 1982 305 beta release, IPC [44B] 3064.2BSD 1983-09-xx [QCU] 307 1983-08-03 [DOC] 3084.3BSD 1986-06-xx [QCU] 309 1986-04-05 [KB], [DOC] 3104.3BSD Tahoe 1988-06-15 [QCU], [DOC] 3114.3BSD NET/1 1988-11-xx [QCU] 312 1989-01-01 [DOC] 3134.3BSD Reno 1990-06-29 [QCU], [DOC] 3144.3BSD NET/2 1991-06-28 [QCU], [DOC] 315 316BSD/386 ALPHA 1991-12-xx [BSDI] 317 first code released to people outside BSDI 318386BSD 0.0 1992-02-xx [DOC] 319BSD/386 0.3.1 1992-04-xx [BSDI] first ext. beta; B customers 320BSD/386 0.3.3 1992-06-xx [BSDI] first CDROM version 321386BSD 0.1 1992-07-28 [DOC] 3224.4BSD Alpha 1992-07-07 323BSD/386 0.9.3 1992-10-xx [BSDI] 324 first external gamma; G customers 325BSD/386 0.9.4 1992-12-xx [BSDI] 326 would have been 1.0 except for request 327 for preliminary injunction 328BSD/386 1.0 1993-03-xx [BSDI] 329 injunction denied; first official release 330NetBSD 0.8 1993-04-20 [NBD] 3314.4BSD 1993-06-01 [USE] 332NetBSD 0.9 1993-08-23 [NBD] 333FreeBSD 1.0 1993-11-01 [FBD] 334BSD/386 1.1 1994-02-xx [BSDI] 3354.4BSD Lite 1994-03-01 [USE] 336FreeBSD 1.1 1994-05-07 [FBD] 337FreeBSD 1.1.5 1994-06-30 [FBD] 338FreeBSD 1.1.5.1 1994-07-05 [FBD] 339 supersedes 1.1.5 5 days after release. 340NetBSD 1.0 1994-10-26 [NBD] 341386BSD 1.0 1994-11-12 [USE] 342FreeBSD 2.0 1994-11-23 [FBD] 343BSD/OS 2.0 1995-01-xx [BSDI] 4.4 lite based 344FreeBSD 2.0.5 1995-06-10 [FBD] 345BSD/OS 2.0.1 1995-06-xx [BSDI] 3464.4BSD Lite Release 2 1995-06-xx [44B] 347 the true final distribution from the CSRG 348FreeBSD 2.1.0 1995-11-19 [FBD] 349NetBSD 1.1 1995-11-26 [NBD] 350BSD/OS 2.1 1996-01-xx [BSDI] 351FreeBSD 2.1.5 1996-07-14 [FBD] 352NetBSD 1.2 1996-10-04 [NBD] 353OpenBSD 2.0 1996-10-18 [OBD] 354FreeBSD 2.1.6 1996-11-16 [FBD] 355FreeBSD 2.1.6.1 1996-11-25 [FBD] (sendmail security release) 356Rhapsody 1997-xx-xx 357FreeBSD 2.1.7 1997-02-20 [FBD] 358BSD/OS 3.0 1997-02-xx [BSDI] 4.4 lite2 based 359FreeBSD 2.2.0 1997-03-16 [FBD] 360FreeBSD 2.2.1 1997-03-25 [FBD] 361FreeBSD 2.2.2 1997-05-16 [FBD] 362NetBSD 1.2.1 1997-05-20 [NBD] (patch release) 363OpenBSD 2.1 1997-06-01 [OBD] 364FreeBSD 2.2.5 1997-10-22 [FBD] 365OpenBSD 2.2 1997-12-01 [OBD] 366NetBSD 1.3 1998-01-04 [NBD] 367FreeBSD 2.2.6 1998-03-25 [FBD] 368NetBSD 1.3.1 1998-03-09 [NBD] (patch release) 369BSD/OS 3.1 1998-03-xx [BSDI] 370OpenBSD 2.3 1998-05-19 [OBD] 371NetBSD 1.3.2 1998-05-29 [NBD] (patch release) 372FreeBSD 2.2.7 1998-07-22 [FBD] 373BSD/OS 4.0 1998-08-xx [BSDI] 374 2-lock MP support, ELF executables 375FreeBSD 3.0 1998-10-16 [FBD] 376 FreeBSD-3.0 is a snapshot from -current, 377 while 3.1 and 3.2 are from 3.x-stable which 378 was branched quite some time after 3.0-release 379FreeBSD 2.2.8 1998-11-29 [FBD] 380OpenBSD 2.4 1998-12-01 [OBD] 381NetBSD 1.3.3 1998-12-23 [NBD] (patch release) 382FreeBSD 3.1 1999-02-15 [FBD] 383BSD/OS 4.0.1 1999-03-xx [BSDI] 384NetBSD 1.4 1999-05-12 [NBD] 385FreeBSD 3.2 1999-05-17 [FBD] 386OpenBSD 2.5 1999-05-19 [OBD] 387NetBSD 1.4.1 1999-08-26 [NBD] (patch release) 388FreeBSD 3.3 1999-09-17 [FBD] 389OpenBSD 2.6 1999-12-01 [OBD] 390FreeBSD 3.4 1999-12-20 [FBD] 391BSD/OS 4.1 1999-12-xx [BSDI] 392FreeBSD 4.0 2000-03-13 [FBD] 393NetBSD 1.4.2 2000-03-19 [NBD] (patch release) 394OpenBSD 2.7 2000-06-15 [OBD] 395FreeBSD 3.5 2000-06-24 [FBD] 396FreeBSD 4.1 2000-07-27 [FBD] 397FreeBSD 3.5.1 2000-07-28 [FBD] 398FreeBSD 4.1.1 2000-09-25 [FBD] (a network-only patch release) 399FreeBSD 4.2 2000-11-21 [FBD] 400NetBSD 1.4.3 2000-11-25 [NBD] (patch release) 401BSD/OS 4.2 2000-11-29 [BSDI] 402OpenBSD 2.8 2000-12-01 [OBD] 403NetBSD 1.5 2000-12-06 [NBD] 404Mac OS X 10.0 2001-03-24 [APL] 405FreeBSD 4.3 2001-04-20 [FBD] 406OpenBSD 2.9 2001-06-01 [OBD] 407NetBSD 1.5.1 2001-07-11 [NBD] (patch release) 408NetBSD 1.5.2 2001-09-13 [NBD] (patch release) 409FreeBSD 4.4 2001-09-18 [FBD] 410Mac OS X 10.1 2001-09-29 [APL] 411OpenBSD 3.0 2001-12-01 [OBD] 412FreeBSD 4.5 2002-01-29 [FBD] 413BSD/OS 4.3 2002-03-14 [WRS] 414OpenBSD 3.1 2002-05-19 [OBD] 415FreeBSD 4.6 2002-06-15 [FBD] 416NetBSD 1.5.3 2002-07-22 [NBD] (patch release) 417FreeBSD 4.6.2 2002-08-15 [FBD] (patch release) 418Mac OS X 10.2 2002-08-23 [APL] 419NetBSD 1.6 2002-09-14 [NBD] 420FreeBSD 4.7 2002-10-08 [FBD] 421OpenBSD 3.2 2002-11-01 [OBD] 422FreeBSD 5.0 2003-01-17 [FBD] 423 FreeBSD 5.0 is a separate branch off of 424 -current, similar to 3.0. 425FreeBSD 4.8 2003-04-03 [FBD] 426NetBSD 1.6.1 2003-04-21 [NBD] (patch release) 427OpenBSD 3.3 2003-05-01 [OBD] 428BSD/OS 5.0 2003-05-?? [WRS] 429FreeBSD 5.1 2003-06-09 [FBD] 430Mac OS X 10.3 2003-10-24 [APL] 431FreeBSD 4.9 2003-10-28 [FBD] 432BSD/OS 5.1 ISE 2003-10-?? [WRS] (final version) 433OpenBSD 3.4 2003-11-01 [OBD] 434FreeBSD 5.2 2004-01-12 [FBD] 435FreeBSD 5.2.1 2004-02-22 [FBD] (patch release) 436NetBSD 1.6.2 2004-03-01 [NBD] (patch release) 437OpenBSD 3.5 2004-04-01 [OBD] 438FreeBSD 4.10 2004-05-27 [FBD] 439DragonFly 1.0 2004-07-12 [DFB] 440OpenBSD 3.6 2004-10-29 [OBD] 441FreeBSD 5.3 2004-11-06 [FBD] 442NetBSD 2.0 2004-12-09 [NBD] 443FreeBSD 4.11 2005-01-25 [FBD] 444DragonFly 1.2.0 2005-04-08 [DFB] 445NetBSD 2.0.2 2005-04-14 [NBD] (security/critical release) 446Mac OS X 10.4 2005-04-29 [APL] 447FreeBSD 5.4 2005-05-09 [FBD] 448OpenBSD 3.7 2005-05-19 [OBD] 449NetBSD 2.0.3 2005-10-31 [NBD] (security/critical release) 450OpenBSD 3.8 2005-11-01 [OBD] 451FreeBSD 6.0 2005-11-01 [FBD] 452NetBSD 2.1 2005-11-02 [NBD] 453NetBSD 3.0 2005-12-23 [NBD] 454DragonFly 1.4.0 2006-01-08 [DFB] 455OpenBSD 3.9 2006-05-01 [OBD] 456FreeBSD 6.1 2006-05-08 [FBD] 457FreeBSD 5.5 2006-05-25 [FBD] 458NetBSD 3.0.1 2006-07-24 [NBD] (security/critical release) 459DragonFly 1.6.0 2006-07-24 [DFB] 460OpenBSD 4.0 2006-11-01 [OBD] 461NetBSD 3.0.2 2006-11-04 [NBD] (security/critical release) 462NetBSD 3.1 2006-11-04 [NBD] 463FreeBSD 6.2 2007-01-15 [FBD] 464DragonFly 1.8.0 2007-01-30 [DFB] 465 466Bibliography 467------------------------ 468 469Leffler, Samuel J., Marshall Kirk McKusick, Michael J Karels and John 470Quarterman. The Design and Implementation of the 4.3BSD UNIX Operating 471System. Reading, Mass. Addison-Wesley, 1989. ISBN 0-201-06196-1 472 473Salus, Peter H. A quarter century of UNIX. Addison-Wesley Publishing 474Company, Inc., 1994. ISBN 0-201-54777-5 475 476McKusick, Marshall Kirk, Keith Bostic, Michael J Karels, and John 477Quarterman. The Design and Implementation of the 4.4BSD Operating 478System. Reading, Mass. Addison-Wesley, 1996. ISBN 0-201-54979-4 479 480McKusick, Marshall Kirk, George Neville-Neil. The Design and 481Implementation of the FreeBSD Operating System. 482Addison-Wesley Professional, Published: Aug 2, 2004. ISBN 0-201-70245-2 483 484Doug McIlroy. Research Unix Reader. 485 486Michael G. Brown. The Role of BSD in the Development of Unix. 487Presented to the Tasmanian Unix Special Interest Group of the 488Australian Computer Society, Hobart, August 1993. 489 490Peter H. Salus. Unix at 25. Byte Magazine, October 1994. 491URL: http://www.byte.com/art/9410/sec8/art3.htm 492 493Andreas Klemm, Lars K�ller. If you're going to San Francisco ... 494Die freien BSD-Varianten von Unix. c't April 1997, page 368ff. 495 496BSD Release Announcements collection. 497URL: http://www.de.FreeBSD.org/de/ftp/releases/ 498 499BSD Hypertext Man Pages 500URL: http://www.FreeBSD.org/cgi/man.cgi 501 502UNIX history graphing project 503URL: http://minnie.tuhs.org/Unix_History/index.html 504 505UNIX history 506URL: http://www.levenez.com/unix/ 507 508James Howard: The BSD Family Tree 509URL: http://ezine.daemonnews.org/200104/bsd_family.html 510("what are the differences between FreeBSD, NetBSD, and OpenBSD?") 511 512 513Acknowledgments 514--------------- 515 516Josh Gilliam for suggestions, bug fixes, and finding very old 517original BSD announcements from Usenet or tapes. 518 519Steven M. Schultz for providing 2.8BSD, 2.10BSD, 2.11BSD manual pages. 520 521-- 522Copyright (c) 1997-2007 Wolfram Schneider <wosch@FreeBSD.ORG> 523URL: http://cvsweb.freebsd.org/src/share/misc/bsd-family-tree 524 525$FreeBSD: head/share/misc/bsd-family-tree 166362 2007-01-31 04:58:03Z maxim $ 526