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ion cite this page get shortened url switch to legacy parser print export download as pdf printable version in other projects wikimedia commons wikidata item appearance move to sidebar hide from wikipedia the free encyclopedia original unix operating system from bell labs research unix refers to the early versions of the unix operating system for dec pdp 7 pdp 11 vax and interdata 7 32 and 8 32 computers developed in the bell labs computing sciences research center csrc the term research unix first appeared in the bell system technical journal vol 57 no 6 part 2 july august 1978 to distinguish it from other versions internal to bell labs such as pwb unix and mert whose code base had diverged from the primary csrc version however that term was little used until version 8 unix 1985 but has been retroactively applied to earlier versions as well prior to v8 the operating system was most commonly called simply unix in caps or the unix time sharing system ancient unix is any early release of the unix code base prior to unix system iii particularly the research unix releases prior to and including version 7 the base for unix 32v as well as later developments of at t unix history edit at t licensed version 5 to educational institutions and version 6 also to commercial sites schools paid 200 and others 20 000 discouraging most commercial use but version 6 was the most widely used version into the 1980s research unix versions are often referred to by the edition of the manual that describes them 1 because early versions and the last few were never officially released outside of bell labs and grew organically so the first research unix would be the first edition and the last the tenth edition another common way of referring to them is as version x unix or v x unix where x is the manual edition all modern editions of unix excepting unix like implementations such as coherent minix and linux derive from the 7th edition 2 starting with the 8th edition versions of research unix had a close relationship to bsd this began by using 4 1cbsd as the basis for the 8th edition in a usenet post from 2000 dennis ritchie described these later versions of research unix as being closer to bsd than they were to unix system v 3 which also included some bsd code 1 research unix 8th edition started from i think bsd 4 1c but with enormous amounts scooped out and replaced by our own stuff this continued with 9th and 10th the ordinary user command set was i guess a bit more bsd flavored than sysvish but it was pretty eclectic versions edit manual edition release date description 1st edition nov 3 1971 first edition of the unix manual based on the version that ran on the pdp 11 at the time the operating system was two years old 4 having been ported from the pdp 7 to the pdp 11 20 in 1970 includes ar as bcd cal cat chdir chmod chown cmp cp date dc df du ed glob init ld ln ls mail mesg mkdir mkfs mount mv nm od pr rm rmdir roff sh sort stat strip su sum tty umount wc who write also precursors of fsck reboot and adb the system also had a b and fortran compiler a basic interpreter device files and functions for managing punched tape dectape and rk05 disks 2nd edition jun 12 1972 total number of installations at the time was 10 with more expected according to the preface of the manual 5 ii adds echo exit login m6 macro processor man nroff strip stty tmg compiler compiler and the first c compiler 4 5 3rd edition feb 1973 introduced a c debugger pipes crypt kill passwd size speak split uniq and yacc commands are split between bin and usr bin requiring a search path 4 usr was the mount point for a second hard disk total number of installations was 16 4th edition nov 1973 first version written in c also introduced comm dump file grep nice nohup ps sleep sync tr wait and printf 3 4 included a snobol interpreter number of installations was listed as above 20 the manual was formatted with troff for the first time version described in thompson and ritchie s cacm paper 6 the first public exposition of the operating system 4 5th edition jun 1974 version 5 unix for the pdp 11 running on simh licensed to selected educational institutions 1 introduced col dd diff eqn find lpr pwd spell tee 4 and the sticky bit targeted the pdp 11 40 and other 11 models with 18 bit addresses installations above 50 6th edition may 1975 version 6 unix for the pdp 11 running in simh includes bc chgrp cron newgrp ptrace 2 ratfor tbl units and wall 4 first version widely available outside of bell laboratories licensed to commercial users 1 and to be ported to non pdp hardware interdata 7 32 may 1977 saw the release of mini unix a cut down v6 for the low end pdp 11 10 7th edition jan 1979 version 7 unix for the pdp 11 running in simh includes the bourne shell ioctl 2 stdio 3 and pcc augmenting dennis ritchie s c compiler 4 adds adb at awk banner basename cu diff3 expr f77 factor fortune iostat join lex lint look m4 make rev sed tabs tail tar test touch true false tsort uucp uux the ancestor of unix system iii and the last release of research unix to see widespread external distributions merged most of the utilities of pwb unix with an extensively modified kernel with almost 80 more lines of code than v6 ported to pdp 11 interdata 8 32 and vax unix 32v 32v was the basis for 3bsd 8th edition feb 1985 7 based on 4 1bsd and system v 7 for the vax with a system v shell and sockets replaced 8 by streams used internally and only licensed for educational use 9 adds berkeley db curses 3 cflow clear compress cpio csh 10 cut ksh internal at t builds only 11 last netstat netnews seq telnet tset ul vi vmstat the blit graphics terminal became the primary user interface 4 includes lisp pascal and altran added a network file system that allowed accessing remote computers files as n hostname path and a regular expression library that introduced an api later mimicked by henry spencer s reimplementation 12 first version with no assembly in the documentation 4 9th edition sep 1986 incorporated code from 4 3bsd used internally featured a generalized version of the streams ipc mechanism introduced in v8 the mount system call was extended to connect a stream to a file the other end of which could be connected to a user level program this mechanism was used to implement network connection code in user space 13 other innovations include sam 4 according to dennis ritchie v9 and v10 were conceptual manuals existed but no os distributions in complete and coherent form 9 10th edition oct 1989 last research unix although the manual was published outside of at t by saunders college publishing 14 there was no full distribution of the system itself 9 novelties included graphics typesetting tools designed to work with troff a c interpreter animation programs and several tools later found in plan 9 the mk build tool and the rc shell v10 was also the basis for doug mcilroy and james a reeds multilevel secure operating system ix 15 plan 9 1992 plan 9 is a successor operating system to research unix developed by bell laboratories computing science research center csrc inferno 1997 inferno is a descendant of plan 9 and shares many design concepts and even source code in the kernel particularly around devices and the styx 9p2000 protocol it shares with plan 9 the unix heritage from bell labs and the unix philosophy licensing edit after the publication of the lions book work was undertaken to release earlier versions of the codebase sco first released the code under a limited educational license citation needed later in january 2002 caldera international later to become sco group and made defunct relicensed but has not made available several versions under the four clause bsd license up to and including version 7 unix unix 32v 16 17 as of 2022 update there has been no widespread use of the code but it can be used on emulator systems and version 5 unix runs on the nintendo game boy advance using the simh pdp 11 emulator 18 version 6 unix provides the basis for the mit xv6 teaching system which is an update of that version to ansi c and the x86 or risc v platform the bsd vi text editor is based on code from the ed line editor in those early unixes therefore traditional vi could not be distributed freely and various work alikes such as nvi were created now that the original code is no longer encumbered the traditional vi has been adapted for modern unix like operating systems 19 sco group inc was previously called caldera international as a result of the sco group inc v novell inc case novell inc was found not to have transferred the copyrights of unix to sco group inc 20 concerns have been raised regarding the validity of the caldera license 21 22 the unix heritage society edit the unix heritage society was founded by warren toomey 23 24 first edition unix was restored to a usable state by a restoration team from the unix heritage society in 2008 the restoration process started with paper listings of the source code which were in pdp 11 assembly language 25 26 legacy edit in 2002 caldera international released 27 unix v1 v2 v3 v4 v5 v6 v7 on pdp 11 and unix 32v on vax as foss under a permissive bsd like software license 28 17 29 in 2017 the unix heritage society and alcatel lucent usa inc on behalf of itself and nokia bell laboratories released v8 v9 and v10 under the condition that only non commercial use was allowed and that they would not assert copyright claims against such use 30 see also edit history of unix list of unix systems references edit 1 2 3 4 fiedler ryan october 1983 the unix tutorial part 3 unix in the microcomputer marketplace byte p 132 retrieved 30 january 2015 siebenmann chris nov 21 2021 why v7 unix matters so much cspace archived from the original on july 29 2025 retrieved october 18 2025 ritchie dennis 26 october 2000 alt folklore computers bsd dennis ritchie archived from the original on 14 july 2014 retrieved 3 july 2014 1 2 3 4 5 6 7 8 9 10 11 mcilroy m d 1987 a research unix reader annotated excerpts from the programmer s manual 1971 1986 pdf technical report cstr bell labs 139 1 2 thompson ken ritchie dennis m june 12 1972 unix programmer s manual second edition pdf bell telephone laboratories archived from the original pdf on 2016 10 06 ritchie d m thompson k 1974 the unix time sharing system communications of the acm 17 7 365 375 doi 10 1145 361011 361061 s2cid 53235982 archived from the original on 2017 02 18 retrieved 2017 03 04 1 2 pirzada shamim sharfuddin 1 september 1988 a statistical examination of the evolution of the unix system doctoral dissertation university of london p 35 hdl 10044 1 7942 unix 8th 2 man cat v org retrieved 2026 06 29 1 2 3 ritchie dennis 27 june 2003 tuhs re v7 unix on vax 11 750 minnie tuhs org archived from the original on 2017 03 05 retrieved 9 april 2014 csh the unix heritage society n d archived from the original on december 20 2022 retrieved december 19 2022 korn david 1984 06 12 where s the beef www tuhs org newsgroup comp unix retrieved 2026 09 09 spencer henry 1986 01 19 regexp 3 newsgroup mod sources usenet 1316 panda uucp archived from the original on 2025 09 15 retrieved 9 january 2013 presotto david l ritchie dennis m 1990 interprocess communication in the ninth edition unix system software practice and experience 19 archived from the original on 2017 04 03 retrieved 2017 03 04 unix tenth edition manual bell labs archived from the original on 3 february 2015 retrieved 25 december 2013 the ix multilevel secure unix system archived from the original on 2015 09 23 retrieved 2013 12 25 johnson ii dion l 2002 01 24 liberal license for ancient unix sources archived from the original on 2022 03 05 retrieved 2017 03 30 1 2 broderick bill january 23 2002 dear unix enthusiasts pdf caldera international archived from the original pdf on 19 february 2009 singh amit august 2004 unix on the game boy advance archived from the original on 2006 08 31 retrieved 2009 10 22 the traditional vi archived from the original on 2025 08 13 retrieved 2025 08 11 10th circuit court of appeals decision pdf archived from the original on september 26 2011 warren toomey the push to get free unix licenses archived from the original on 2025 05 20 retrieved 2025 06 15 why bsd os is the best candidate for being the only tested legally open unix 26 november 2018 archived from the original on 15 june 2025 retrieved 15 june 2025 davis a jesse jiryu june 14 2017 assembling the history of unix lwn net archived from the original on 15 june 2023 retrieved 15 june 2023 jude allan october 13 2022 warren toomey interview bsd now archived from the original on 15 june 2023 retrieved 15 june 2023 mp3 44 34 toomey warren july 2010 first edition unix its creation and restoration ieee annals of the history of computing 32 3 74 82 bibcode 2010iahc 32c 74t doi 10 1109 mahc 2009 55 s2cid 18586380 the restoration of early unix artifacts pdf archived pdf from the original on 2025 06 27 retrieved 2025 06 15 caldera releases original unices under bsd license archived 2008 10 12 at the wayback machine on slashdot org 2002 unix is free lemis com 2002 01 24 archived from the original on 2022 03 05 retrieved 2017 03 30 darwin ian f 2002 02 03 why caldera released unix a brief history linuxdevcenter o reilly media archived from the original on 2004 06 01 retrieved 2022 01 18 chirgwin richard 30 march 2017 samizdat no more old unix source code opened for study the register archived from the original on 30 march 2017 retrieved 30 march 2017 external links edit wikimedia commons has media related to research unix unix evolution postscript by ian f darwin and geoffrey collyer unix heritage more links and source code for some research unix versions the evolution of the unix time sharing system by dennis m ritchie the restoration of early unix artifacts by warren toomey school of it bond university full manual pages documentation for research unix 8th edition list of new features in research unix 9th edition emulator for running unix v9 pamela jones august 23 2003 ancient unix released under what terms groklaw the unix heritage society tuhs for the preservation and maintenance of historical unix systems code disk images and related at tuhs unix first edition manual pages restoration of 1st edition unix kernel sources from bell laboratories v t e unix by bell labs research version 6 unix 1975 version 7 unix 1979 unix 32v 1979 internal cb unix c 1975 pwb unix 1977 mert dmert unix rt commercial unix system iii 1982 unix system v 1983 people stephen r bourne lorinda cherry tom duff stuart feldman brian kernighan david korn mike lesk john mashey douglas mcilroy lee e mcmahon joe ossanna rob pike dennis ritchie ken thompson companies at t computer systems unix system laboratories category v t e unix and unix like operating systems and compatibility layers architecture filesystem history philosophy security shell operating systems bsd 386bsd freebsd netbsd openbsd dragonfly bsd darwin macos ios audioos ipados tvos watchos bridgeos dyn...
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