Version 7 Unix: Difference between revisions

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Unix versions from Bell Labs were designated by the edition of the user's manual with which they were accompanied. Released in 1979, the Seventh Edition was preceded by [[Version 6 Unix|Sixth Edition]], which was the first version licensed to commercial users.<ref name="fiedler198310">{{cite news | url=https://archive.org/stream/byte-magazine-1983-10/1983_10_BYTE_08-10_UNIX#page/n133/mode/2up | title=The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace | work=BYTE | date=October 1983 |access-date=2018-09-11 |issn=0360-5280 |oclc=854802500 |first=David |last=Fiedler | pages=132}}</ref> Development of the [[Research Unix]] line continued with the [[Version 8 Unix|Eighth Edition]], which incorporated development from [[Berkeley Software Distribution|4.1BSD]], through the Tenth Edition, after which the Bell Labs researchers concentrated on developing [[Plan 9 from Bell Labs|Plan 9]].
Unix versions from Bell Labs were designated by the edition of the user's manual with which they were accompanied. Released in 1979, the Seventh Edition was preceded by [[Version 6 Unix|Sixth Edition]], which was the first version licensed to commercial users.<ref name="fiedler198310">{{cite news | url=https://archive.org/stream/byte-magazine-1983-10/1983_10_BYTE_08-10_UNIX#page/n133/mode/2up | title=The Unix Tutorial / Part 3: Unix in the Microcomputer Marketplace | work=BYTE | date=October 1983 |access-date=2018-09-11 |issn=0360-5280 |oclc=854802500 |first=David |last=Fiedler | pages=132}}</ref> Development of the [[Research Unix]] line continued with the [[Version 8 Unix|Eighth Edition]], which incorporated development from [[Berkeley Software Distribution|4.1BSD]], through the Tenth Edition, after which the Bell Labs researchers concentrated on developing [[Plan 9 from Bell Labs|Plan 9]].


V7 was the first readily [[porting|portable]] version of Unix. As this was the era of [[minicomputer]]s, with their many architectural variations, and also the beginning of the market for 16-bit microprocessors, many ports were completed within the first few years of its release. The first [[Sun Microsystems|Sun]] workstations (then based on the [[Motorola 68000]]) ran a V7 port by [[UniSoft]];<ref>{{cite web|url=http://www.sunhelp.org/faq/sunref1.html|title=The Sun Hardware Reference, Part II|author=James W. Birdsall|quote=Sun-1's were the very first models ever produced by Sun. The earliest ran Unisoft V7 UNIX; SunOS 1.x was introduced later.}}</ref> the first version of [[Xenix]] for the [[Intel 8086]] was derived from V7 and [[Onyx Systems]] soon produced a [[Zilog]] [[Zilog Z8000|Z8000]] computer running V7. The [[VAX]] port of V7, called [[UNIX/32V]], was the direct ancestor of the popular [[Berkeley Software Distribution|4BSD family]] of Unix systems.
V7 was the first readily [[porting|portable]] version of Unix. As this was the era of [[minicomputer]]s, with their many architectural variations, and also the beginning of the market for 16-bit microprocessors, many ports were completed within the first few years of its release. The first [[Sun Microsystems|Sun]] workstations (then based on the [[Motorola 68000]]) ran a V7 port by [[UniSoft]];<ref>{{cite web|url=http://www.sunhelp.org/faq/sunref1.html|title=The Sun Hardware Reference, Part II|author=James W. Birdsall|quote=Sun-1's were the very first models ever produced by Sun. The earliest ran Unisoft V7 UNIX; SunOS 1.x was introduced later.}}</ref> the first version of [[Microsoft]] [[Xenix]] for the [[Intel 8086]] was derived from V7, and [[Onyx Systems]] soon produced a [[Zilog]] [[Zilog Z8000|Z8000]] computer running V7. The [[VAX]] port of V7, called '''[[UNIX/32V]]''', was the direct ancestor of [[UNIX System V]]{{disputed inline|UNIX/32V ''the'' direct ancestor of UNIX System V?|date=December 2025}} and the popular [[Berkeley Software Distribution|4BSD family]] of Unix systems.


The group at the [[University of Wollongong]] that had [[Wollongong Unix|ported V6]] to the [[Interdata 7/32]] ported V7 to that machine as well. [[Interdata]] sold the port as Edition VII, making it the first commercial UNIX offering.{{citation needed|date=December 2012}}
The group at the [[University of Wollongong]] that had [[Wollongong Unix|ported V6]] to the [[Interdata 7/32]] ported V7 to that machine as well. [[Interdata]] sold the port as Edition VII, making it the first commercial UNIX offering.{{citation needed|date=December 2012}}
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==Reception==
==Reception==
Due to its power yet elegant simplicity, many old-time Unix users remember V7 as the pinnacle of Unix development and have dubbed it "the last true Unix", an improvement over all preceding and following Unices. At the time of its release, though, its greatly extended feature set came at the expense of a decrease in performance compared to V6, which was to be corrected largely by the user community.<ref name="penguin">{{cite book |first=Peter H. |last=Salus |author-link=Peter H. Salus |title=The Daemon, the Gnu and the Penguin |url=http://www.groklaw.net/article.php?story=20050502114023686 |publisher=[[Groklaw]] |year=2005}}</ref>
Due to its power yet elegant simplicity, many old-time Unix users remember V7 as the pinnacle of Unix development and have dubbed it "the last true Unix", an improvement over all preceding and following Unices. At the time of its release, though, its greatly extended feature set came at the expense of a decrease in performance compared to V6, which was to be corrected largely by the user community.<ref name="penguin">{{cite book |first=Peter H. |last=Salus |author-link=Peter H. Salus |title=The Daemon, the Gnu and the Penguin |url=http://www.groklaw.net/article.php?story=20050502114023686 |publisher=[[Groklaw]] |year=2005 |archive-date=2023-05-21 |access-date=2015-09-10 |archive-url=https://web.archive.org/web/20230521103742/http://www.groklaw.net/article.php?story=20050502114023686 |url-status=usurped }}</ref>


The number of [[system call]]s in Version 7 was only around 50, while later Unix and Unix-like systems continued to add many more:<ref>Stevens, W Richard. Rago, Stephen A. ''Advanced Programming in the UNIX Environment, 3rd Edition.'' 2013. p. 21</ref>
The number of [[system call]]s in Version 7 was only around 50, while later Unix and Unix-like systems continued to add many more:<ref>{{cite book |last1=Stevens |author-link1=W. Richard Stevens |first1=W. Richard |last2=Rago |first2=Stephen A. |title=Advanced Programming in the UNIX Environment |edition=3rd |date=2013 |page=21}}</ref>


{{blockquote|Version 7 of the Research UNIX System provided about 50 system calls, [[4.4BSD]] provided about 110, and [[SVR4]] had around 120. The exact number of system calls varies depending on the operating system version. More recent systems have seen incredible growth in the number of supported system calls. [[Linux]] 5.15.0 has 449 system calls and [[FreeBSD]] 8.0 has over 450.}}
{{blockquote|Version 7 of the Research UNIX System provided about 50 system calls, [[4.4BSD]] provided about 110, and [[SVR4]] had around 120. The exact number of system calls varies depending on the operating system version. More recent systems have seen incredible growth in the number of supported system calls. As of December 2025 [[Linux]] 6.18 has 470, and [[FreeBSD]] 15 has 598.}}


==Released as free software==
==Released as free software==
[[File:Pdp11-unixv7.png|thumb|Screenshot of a PDP-11 booting Version 7 Unix in a simulator.]]
[[File:Pdp11-unixv7.png|thumb|Screenshot of a PDP-11 booting Version 7 Unix in a simulator]]
In 2002, [[Caldera International]] released<ref>[http://slashdot.org/articles/02/01/24/0146248.shtml Caldera releases original unices under BSD license] on [[slashdot.org]] (2002)</ref> V7 as [[free and open source software|FOSS]] under a [[Permissive license|permissive]] [[BSD-license|BSD-like]] [[software license]].<ref>{{cite web |url=http://www.lemis.com/grog/UNIX/|publisher=lemis.com |title=UNIX is free! |date=2002-01-24}}</ref><ref name="Caldera-license.pdf">{{cite web|url=http://www.tuhs.org/Archive/Caldera-license.pdf |archive-url=https://web.archive.org/web/20090219220353/http://www.tuhs.org/Archive/Caldera-license.pdf|archive-date=February 19, 2009 |title=Dear Unix enthusiasts |last=Broderick |first=Bill |date=January 23, 2002 |publisher=[[Caldera International]]}}</ref><ref>{{cite web|url=http://www.linuxdevcenter.com/pub/a/linux/2002/02/28/caldera.html |publisher=[[O'Reilly Media]] |work=Linuxdevcenter |title=Why Caldera Released Unix: A Brief History |first=Ian F. |last=Darwin |date=2002-02-03 |access-date=2016-01-19 |archive-url=https://web.archive.org/web/20160126012127/http://www.linuxdevcenter.com/pub/a/linux/2002/02/28/caldera.html |archive-date=2016-01-26}}</ref>
In 2002, [[Caldera International]] released<ref>{{cite web |url=http://slashdot.org/articles/02/01/24/0146248.shtml |title=Caldera releases original unices under BSD license |website=[[slashdot.org]] |date=2002}}</ref> V7 as [[free and open source software|FOSS]] under a [[Permissive license|permissive]] [[BSD-license|BSD-like]] [[software license]].<ref>{{cite web |url=http://www.lemis.com/grog/UNIX/|publisher=lemis.com |title=UNIX is free! |date=2002-01-24}}</ref><ref name="Caldera-license.pdf">{{cite web|url=http://www.tuhs.org/Archive/Caldera-license.pdf |archive-url=https://web.archive.org/web/20090219220353/http://www.tuhs.org/Archive/Caldera-license.pdf|archive-date=February 19, 2009 |title=Dear Unix enthusiasts |last=Broderick |first=Bill |date=January 23, 2002 |publisher=[[Caldera International]]}}</ref><ref>{{cite web|url=http://www.linuxdevcenter.com/pub/a/linux/2002/02/28/caldera.html |publisher=[[O'Reilly Media]] |work=Linuxdevcenter |title=Why Caldera Released Unix: A Brief History |first=Ian F. |last=Darwin |date=2002-02-03 |access-date=2016-01-19 |archive-url=https://web.archive.org/web/20160126012127/http://www.linuxdevcenter.com/pub/a/linux/2002/02/28/caldera.html |archive-date=2016-01-26}}</ref>


Bootable images for V7 can still be [http://ftp.fibranet.cat/UnixArchive/Distributions/Boot_Images/ downloaded] today, and can be run on modern hosts using PDP-11 emulators such as [[SIMH]].
Bootable images for V7 can still be [http://ftp.fibranet.cat/UnixArchive/Distributions/Boot_Images/ downloaded] today, and can be run on modern hosts using PDP-11 emulators such as [[SIMH]].


An [[x86]] port has been developed by Nordier & Associates.<ref>https://www.nordier.com/#v7x86 Robert Nordier - UNIX v7/x86</ref>
An [[x86]] port has been developed by Nordier & Associates.<ref>{{cite web |url=https://www.nordier.com/#v7x86 |title=Robert Nordier - UNIX v7/x86}}</ref>


[[Paul Allen]] maintained{{when|date=August 2019}} several publicly accessible historic computer systems, including a PDP-11/70 running Unix Version 7.
[[Paul Allen]] maintained{{when|date=August 2019}} several publicly accessible historic computer systems, including a PDP-11/70 running Unix Version 7.
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Many new features were introduced in Version 7.
Many new features were introduced in Version 7.
*Programming tools: [[lex programming tool|lex]], [[lint (software)|lint]], and [[make (software)|make]].
*Programming tools: [[lex programming tool|lex]], [[lint (software)|lint]], and [[make (software)|make]].
 
:The [[Portable C Compiler]] (pcc) was provided along with the earlier, PDP-11-specific, C compiler by [[Dennis Ritchie|Ritchie]].
The [[Portable C Compiler]] (pcc) was provided along with the earlier, PDP-11-specific, C compiler by [[Dennis Ritchie|Ritchie]].
:These first appeared in the Research Unix lineage in Version 7, although early versions of some of them had already been picked up by [[PWB/UNIX]].<ref name="reader">{{cite tech report |author-link=Doug McIlroy |first=M. Douglas |last=McIlroy |year=1987 |url=http://www.cs.dartmouth.edu/~doug/reader.pdf |title=A Research Unix reader: annotated excerpts from the Programmer's Manual, 1971–1986 |number=CSTR 139 |publisher=Bell Labs |access-date=2018-07-22}}</ref>
 
These first appeared in the Research Unix lineage in Version 7, although early versions of some of them had already been picked up by [[PWB/UNIX]].<ref name="reader">{{cite tech report |author-link=Doug McIlroy |first=M. Douglas |last=McIlroy |year=1987 |url=http://www.cs.dartmouth.edu/~doug/reader.pdf |title=A Research Unix reader: annotated excerpts from the Programmer's Manual, 1971–1986 |number=CSTR 139 |publisher=Bell Labs |access-date=2018-07-22}}</ref>
 
*New commands: the [[Bourne shell]],{{r|reader}} at, [[awk]], calendar, [[F77#FORTRAN 77|f77]], [[fortune (Unix)|fortune]], [[tar (computing)|tar]] (replacing the tp command), touch
*New commands: the [[Bourne shell]],{{r|reader}} at, [[awk]], calendar, [[F77#FORTRAN 77|f77]], [[fortune (Unix)|fortune]], [[tar (computing)|tar]] (replacing the tp command), touch
*Networking support, in the form of [[uucp]] and [[Datakit]]<ref name="reader"/>
*Networking support, in the form of [[uucp]] and [[Datakit]]<ref name="reader"/>

Latest revision as of 09:04, 31 December 2025

Template:Short description Script error: No such module "about". Script error: No such module "Unsubst".Script error: No such module "Check for unknown parameters". Version 7 Unix, also called Seventh Edition Unix, Version 7 or just V7, was an important early release of the Unix operating system. V7, released in 1979, was the last Bell Laboratories release to see widespread distribution before the commercialization of Unix by AT&T Corporation in the early 1980s. V7 was originally developed for Digital Equipment Corporation's PDP-11 minicomputers and was later ported to other platforms.

Overview

Unix versions from Bell Labs were designated by the edition of the user's manual with which they were accompanied. Released in 1979, the Seventh Edition was preceded by Sixth Edition, which was the first version licensed to commercial users.[1] Development of the Research Unix line continued with the Eighth Edition, which incorporated development from 4.1BSD, through the Tenth Edition, after which the Bell Labs researchers concentrated on developing Plan 9.

V7 was the first readily portable version of Unix. As this was the era of minicomputers, with their many architectural variations, and also the beginning of the market for 16-bit microprocessors, many ports were completed within the first few years of its release. The first Sun workstations (then based on the Motorola 68000) ran a V7 port by UniSoft;[2] the first version of Microsoft Xenix for the Intel 8086 was derived from V7, and Onyx Systems soon produced a Zilog Z8000 computer running V7. The VAX port of V7, called UNIX/32V, was the direct ancestor of UNIX System VScript error: No such module "Unsubst". and the popular 4BSD family of Unix systems.

The group at the University of Wollongong that had ported V6 to the Interdata 7/32 ported V7 to that machine as well. Interdata sold the port as Edition VII, making it the first commercial UNIX offering.Script error: No such module "Unsubst".

DEC distributed their own PDP-11 version of V7, called V7M (for modified). V7M, developed by DEC's original Unix Engineering Group (UEG), contained many enhancements to the kernel for the PDP-11 line of computers including significantly improved hardware error recovery and many additional device drivers.[3] UEG evolved into the group that later developed Ultrix.

Reception

Due to its power yet elegant simplicity, many old-time Unix users remember V7 as the pinnacle of Unix development and have dubbed it "the last true Unix", an improvement over all preceding and following Unices. At the time of its release, though, its greatly extended feature set came at the expense of a decrease in performance compared to V6, which was to be corrected largely by the user community.[4]

The number of system calls in Version 7 was only around 50, while later Unix and Unix-like systems continued to add many more:[5]

<templatestyles src="Template:Blockquote/styles.css" />

Version 7 of the Research UNIX System provided about 50 system calls, 4.4BSD provided about 110, and SVR4 had around 120. The exact number of system calls varies depending on the operating system version. More recent systems have seen incredible growth in the number of supported system calls. As of December 2025 Linux 6.18 has 470, and FreeBSD 15 has 598.

Script error: No such module "Check for unknown parameters".

Released as free software

File:Pdp11-unixv7.png
Screenshot of a PDP-11 booting Version 7 Unix in a simulator

In 2002, Caldera International released[6] V7 as FOSS under a permissive BSD-like software license.[7][8][9]

Bootable images for V7 can still be downloaded today, and can be run on modern hosts using PDP-11 emulators such as SIMH.

An x86 port has been developed by Nordier & Associates.[10]

Paul Allen maintainedScript error: No such module "Unsubst". several publicly accessible historic computer systems, including a PDP-11/70 running Unix Version 7.

New features in Version 7

Many new features were introduced in Version 7.

The Portable C Compiler (pcc) was provided along with the earlier, PDP-11-specific, C compiler by Ritchie.
These first appeared in the Research Unix lineage in Version 7, although early versions of some of them had already been picked up by PWB/UNIX.[11]

Multiplexed files

A feature that did not survive long was a second way (besides pipes) to do inter-process communication: multiplexed files. A process could create a special type of file with the mpx system call; other processes could then open this file to get a "channel", denoted by a file descriptor, which could be used to communicate with the process that created the multiplexed file.[13] Mpx files were considered experimental, not enabled in the default kernel,[14] and disappeared from later versions, which offered sockets (BSD) or CB UNIX's IPC facilities (System V) instead[15] (although mpx files were still present in 4.1BSD[16]).

See also

References

<templatestyles src="Reflist/styles.css" />

  1. ↑ Script error: No such module "citation/CS1".
  2. ↑ Script error: No such module "citation/CS1".
  3. ↑ Script error: No such module "citation/CS1".
  4. ↑ Script error: No such module "citation/CS1".
  5. ↑ Script error: No such module "citation/CS1".
  6. ↑ Script error: No such module "citation/CS1".
  7. ↑ Script error: No such module "citation/CS1".
  8. ↑ Script error: No such module "citation/CS1".
  9. ↑ Script error: No such module "citation/CS1".
  10. ↑ Script error: No such module "citation/CS1".
  11. ↑ a b Script error: No such module "citation/CS1".
  12. ↑ Script error: No such module "Citation/CS1".
  13. ↑ [[[:Template:Man/v7]] mpx(Template:Man/v7)] – Template:Man/v7
  14. ↑ [[[:Template:Man/v7]] mkconf(Template:Man/v7)] – Template:Man/v7
  15. ↑ Script error: No such module "citation/CS1".
  16. ↑ Script error: No such module "Citation/CS1".

Script error: No such module "Check for unknown parameters".

External links

Script error: No such module "Navbox". Template:Unix-like

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