Unix System Laboratories

Last updated

UNIX System Laboratories
Company type Private
Industry
FoundedNovember 1989 (1989-11)
FateAcquired by Novell June 1993 (1993-06)
Headquarters
Summit, New Jersey
,
United States
Number of locations
3
Key people
Products
  • Operating systems
  • transaction monitors
  • C++ language products
Revenue$100 million (1991, equivalent to $224 million today)
Number of employees
500 (1991)
Divisions
  • UNIX System V Software
  • Open Solutions Software

Unix System Laboratories (USL), sometimes written UNIX System Laboratories to follow relevant trademark guidelines of the time, was an American software laboratory and product development company that existed from 1989 through 1993. At first wholly, and then majority, owned by AT&T, it was responsible for the development and maintenance of one of the main branches of the Unix operating system, the UNIX System V Release 4 source code product. Through Univel, a partnership with Novell, it was also responsible for the development and production of the UnixWare packaged operating system for Intel architecture. In addition it developed Tuxedo, a transaction processing monitor, and was responsible for certain products related to the C++ programming language. USL was based in Summit, New Jersey, and its CEOs were Larry Dooling followed by Roel Pieper.

Contents

Created from earlier AT&T entities, USL was, as industry writer Christopher Negus has observed, the culmination of AT&T's long involvement in Unix, "a jewel that couldn't quite find a home or a way to make a profit." [1] USL was sold to Novell in 1993.

Origins as subsidiary of AT&T

AT&T announced the creation of the UNIX Software Operation (USO) – a separate and distinct AT&T business unit responsible for the development, marketing, and licensing of UNIX System V software – in January 1989. [2] This was done, as a subsequent press release stated, "in order to separate AT&T's UNIX System source code business from its computer systems business," [3] the latter a reference to AT&T Computer Systems. USO included the AT&T Data Systems Group organizations responsible for UNIX product planning and management, licensing, and marketing. [4] Peter J. Weinberger was named chief scientist of USO while also retaining his job in the computing science research center at Bell Labs; no other Bell Labs assets were transferred to USO. [4] The head of USO was Larry Dooling, who had been a vice-president in sales and marketing in the AT&T Data Systems Group. [4]

Unlike the original Unix work, which had been done in the Bell Labs facility in Murray Hill, USO and the commercialization work was done a few miles away in Summit, New Jersey. [1] [5] This AT&T Bell Labs location was known as SF for Summit Facility. [6]

UNIX System Laboratories, Inc., came into being as a separate subsidiary of AT&T in November 1989 and was assigned all U.S.-based AT&T Unix and USO assets. [3] However USO continued to operate as USO until June 1990, when the reincorporation of AT&T's European and Asian Unix business operations as wholly owned subsidiaries of USL was completed. [2] At that point the UNIX Software Operation was publicly rebranded as UNIX System Laboratories. [3] Again, a point of emphasis was to separate the Unix-based business from AT&T's hardware-based business. [7] The subsidiaries were known as UNIX System Laboratories Europe, Ltd., sited near Ealing Broadway in London, and UNIX System Laboratories Pacific, Ltd., located in Shiba, Tokyo. [8] Dooling was named the initial president of USL, continuing from his position at USO. [3]

These organizational changes were taking place in the context of the open systems movement and the ongoing Unix wars. In consequence, the pro-AT&T side Unix International (as opposed to the anti-AT&T side Open Software Foundation) declared that "In the last 18 months AT&T has made good on its commitment to treat UNIX System as the industry asset it is and to open the UNIX System V development process to the entire industry." [3]

Unix System V work

Multi-part room numbers were characteristic of the AT&T heritage of the USL office in Summit USL office in Summit with room number.jpg
Multi-part room numbers were characteristic of the AT&T heritage of the USL office in Summit

One unit within USL, called the UNIX System V Software business unit and headed by Michael J. DeFazio, was responsible for the development of the UNIX System V base technology. [3] DeFazio had held a similar role within USO. [4] The USO/USL staff was heavily involved in the creation of UNIX System V Release 4, which shipped in 1989 and was a joint project with Sun Microsystems. [9] This work incorporated technology from a variety of Unix-based efforts, including UNIX System V, BSD, and Xenix. [9] There were additions and new innovations as well from both the AT&T and Sun sides. System V Release 4 debuted at the Unix Expo trade show in New York in November 1989, in the form of source code availability for it as well as demonstrations from Unix International of SVR4-based applications running on seventeen different vendor platforms. [10] End-user versions of Release 4 became available during 1990. [11]

Next USL engaged in an especially arduous effort into trying to satisfy the requirements of the National Computer Security Center's Trusted Computer System Evaluation Criteria ("Orange Book") to the B2 level. [12] This manifested itself in System V Release 4.1 ES (Enhanced Security), which also included generally useful features such as support for dynamic loading of kernel modules. [13]

Following that, USL worked on System V Release 4.2, which was released in June 1992. [14] InfoWorld characterized this effort as "at the core of an assault on the enterprise networking market," with a modular architecture that stressed improved support for enterprise- and network-level administration, drivers for both Token Ring and Ethernet, and a greater ability to run on low-end machine configurations. [14]

Multiprocessing became the focus of the final USL-based OEM release of System V, which was Release 4.2MP, released in December 1993. [9]

USL continued the publication of an early Unix standard, the System V Interface Definition (SVID). [11] Moreover, the SVID became one of the bases for the more important, vendor-independent POSIX standard for Unix, which System V Release 4 releases also conformed to, as well as the later Single UNIX Specification. [11]

USL produced many books documenting various aspects of Unix System V. [15] USL also provided some training and consulting services for Unix systems. [16]

Chorus and Ouverture

USL Europe's offices were in Ealing, London (in the building on the right side after the road bends, as seen here in 2009) High Street in Ealing.jpg
USL Europe's offices were in Ealing, London (in the building on the right side after the road bends, as seen here in 2009)

In 1991, USL forged an arrangement with the French company Chorus Systèmes SA to engage in cooperative work on the Chorus microkernel technology, with the idea of supporting SVR4 on a microkernel and thereby making it more scalable and better suited for parallel and distributed applications. [17] [18] As part of this, USL took a $1 million stake in Chorus Systèmes. [17] Much of the USL Chorus work was done at the USL Europe facility in London. [19] By 1993 the work was still ongoing, with questions of industry standardization of interfaces arising. [20] Unisys was also part of the collaboration effort. [18] Announcements made during 1993 promised an OEM release in 1994 and a general availability release in 1995. [18]

This was part of the larger Ouverture project, a $14 million effort that was itself part of the European Strategic Program on Research in Information Technology (ESPRIT), overseen by the European Commission. [21]

Other software work

Another unit within USL, called the Open Solutions Software business unit and headed by Joel A. Appelbaum, was responsible for other system software that in some way worked in conjunction with Unix. [3]

The Tuxedo transaction processing middleware had also been transferred from elsewhere in AT&T to USL. It had originated as the Loop Maintenance Operations System (LMOS) followed by the Unix Transaction System (UNITS) and was used for projects internally within AT&T. It was then renamed by USL and, as Release 4.0 of what was now called Tuxedo, in 1989 was offered for the first time as a commercial product. [22]

USL also developed and marketed the OSI Communications Platform, which was an implementation of the OSI protocols for Unix-based networking. [23]

C++ language work

There was also a languages department at Unix System Laboratories, which was responsible for the C language compiler and development tools used to build Unix. [4] Moreover, it was responsible for commercial sales related to the C++ language, including development tools such as the Cfront compiler that had come from AT&T. [24] Indeed, the paper describing one of the first implementations of automatic instantiation of C++ templates in a C++ compiler had as lead author an engineer associated with Unix System Laboratories. [25] [26] And Margaret A. Ellis, co-author with C++ creator Bjarne Stroustrup of The Annotated C++ Reference Manual, an important publication in the history of the language, was a USL software engineer. [24]

A software developer working in the Summit building Office within the Unix System Laboratories building in Summit, New Jersey--March 1994.jpg
A software developer working in the Summit building

USL also continued the development of, and attempted to market, C++ Standard Components, an early instance of a C++ software foundation library that supported container classes and various other computer science-based functionality such as finite-state machines, graphs, and regular expressions. [27] [28] The Standard Components originated in conjunction with early developments in the C++ language in Bell Labs and became widely used internally within AT&T, [24] by one estimate being used in hundreds of projects. [29] They represented an effort among early library writers there to design reusable code using C++ idioms. [26] Unlike its other offerings, which were sold to OEM vendors and resellers, here USL sold to end users. [28] The initial release of USL C++ Standard Components to the general computing industry was labelled as Release 2.0 and occurred in 1991; [30] it suffered from an awkward mechanism to get around the lack of templates in the container classes. [28] That was followed by Release 3.0, which added support for templates, in 1992. [30]

Some within USL believed that C++ Standard Components could become a language standard as well as a significant source of revenue, [24] but it had trouble gaining traction outside of AT&T. Stroustrup would later describe these goals as "a misguided belief". [24] In any case, all such libraries were soon eclipsed by the radically different Standard Template Library (STL), which became the standardized foundation library for the C++ language. [31] As it happens, one of the Standard Components, array_alg, was designed by the creator of STL, Alex Stepanov, and can be considered an early predecessor of STL. [32]

Partial spinoff from AT&T

USL presentation folder, made starting 1991 Unix System Laboratories presentation folder.jpg
USL presentation folder, made starting 1991

In April 1991, USL became partly independent of AT&T when about 22 percent of it, worth about $65 million, was sold to eleven outside computer vendors: Amdahl, Motorola, Novell, Sun, ICL, Olivetti, Fujitsu, NEC, OKI Electric, Toshiba, and the Institute for Information Industry. [33] There was a stated goal to lessen the control AT&T had over Unix, which would lead to USL becoming a publicly owned company within three years. [33] An AT&T executive said, "AT&T is convinced that the best way to nurture the growth of the open systems movement and to share into it ourselves is to establish an independent Unix Systems Laboratory with the technical guidance of Unix International and the business advice of investors who will ensure that USL is run properly and profitably." [23]

By this point USL had some 500 employees, 2400 customers, and annual revenue around the $100 million mark. [33] AT&T said that USL had been profitable since its inception in 1989. [33]

USL got a new president and CEO in November 1991 when Dooling was replaced by the Dutchman Roel Pieper, formerly chief technical officer of Software AG. [34]

USL was aggressive in defending its perceived intellectual property rights, initiating as the plaintiff a lawsuit in 1992 against Berkeley Software Design makers of and the Regents of the University of California over copyrights and trademarks related to Unix. [35] The case was known as UNIX System Laboratories, Inc. v. Berkeley Software Design, Inc. and in it USL asked the court for a preliminary injunction that would bar the Berkeley firm and the university from distributing their Net/2 operating system release, which was implied to be Unix, until the case was concluded. [36] In response the university filed a countersuit against AT&T for alleged breaches in the licensing agreement the two parties had. [35] (The case was settled out of court in January 1994. [36] )

Univel and UnixWare

In December 1991, USL combined with Novell to form the Univel joint venture. [37] The goal was to make the "Destiny" desktop for Intel commodity hardware, which would be USL's first shrink-wrapped binary product, with the necessary resources for sales, marketing, and distribution being moved into the new entity. [38] Kanwal Rekhi, a Novell vice president who helped launch Univel, said the goal was to create a "Unix for the masses". [39]

A May 1992 InfoWorld interview with Pieper captured some of the ambitions of USL at the time, as Pieper said: "It is not just a new Unix version; rather it is the creation of an entire model change for Unix that says there are better ways to bring the benefits and features of Unix into a distributed PC environment. The earlier model did not allow Unix to play in the low-end market because of its size, complexity, and cost. The new model calls for business partnerships, such as the one with Novell, to deliver Unix to the commercial marketplace." [40] In another interview around the same time, Pieper predicted that if the new Unix became a success, USL revenue could increase ten-fold to $1 billion within five years. [41] Pieper acknowledged that similar Unix efforts had failed in the past, but said that the presence of Novell's PC presence and marketing experience as well as the interest of Intel would make the difference this time. [40] Indeed, Pieper had aspirations to be another Bill Gates: "I want to be in the same position." [41]

UnixWare 1.0, which is what Destiny became a product as, was announced on October 12, 1992. [42] It was based on the Unix System V release 4.2 kernel. The MoOLIT toolkit was used for the windowing system, allowing the user to choose between an OPEN LOOK or MOTIF-like look and feel at run time. In order to make the system more robust on commodity desktop hardware the Veritas VXFS journaling file system was used in place of the UFS file system used in SVR4. Networking support in UnixWare included both TCP/IP and interoperability with Novell's NetWare protocols of IPX/SPX. [43] The former were the standard among Unix users at the time of development, while PC networking was much more commonly based on the highly successful NetWare product; indeed, the base level of the Personal Edition of UnixWare did not even have TCP/IP included, while the Application Server version did. [43]

Initial sales of UnixWare were underwhelming, with Unix facing a difficult time in the PC market. [44] This was in part because Windows already had a stronghold there, in part because USL's third-party licensing payment obligations made low-cost sales uneconomical, and in part because of a lack of applications to run on UnixWare. [1]

Acquisition by Novell

The Summit building in the Novell Unix Systems Group era Novell building in Summit, New Jersey that housed Unix Systems Group, which had been Unix System Laboratories-March 1994.jpg
The Summit building in the Novell Unix Systems Group era

On December 21, 1992, it was announced that Novell would acquire Unix System Laboratories, and all of its Unix assets, including all copyrights, trademarks, and licensing contracts, for some $335 million in stock. [5] The news led to large headlines of the "NOVELL BUYS UNIX" variety. [45] The measure was intended to help Novell compete against Microsoft, which was on the verge of including networking as a built-in feature of Windows in conjunction with the Windows NT server. [5] [44] It was also an outgrowth of Novell chief Ray Noorda's theories about coopetition in a technology industry. [46] [47]

The move seemed like a long shot to analysts, with a commentary piece in Computerworld outlining the obstacles to success and stating, "Saying this deal has the technical potential to counter Windows NT is very different from predicting that it will do so." [44]

There was negative reaction to the acquisition from USL shareholders, USL employees, and members of Unix International. [46] Noorda had to emphasize that Novell had no plans to move USL operations from New Jersey to Utah, where Novell was based. [46] And Noorda and Pieper had to travel to Japan to reassure USL shareholders and investors there. [46]

Nonetheless, the deal was finalized in June 1993. [16] Novell created the Unix Systems Group to contain the new business, which also absorbed the Univel venture. [48] Rekhi was named as the head of the Unix Systems Group. [49] Pieper, who had been assigned under Rekhi with little role to play, soon departed, leaving Novell in August 1993. [50] [49]

The USL Europe office in London was moved into Novell's facility in Bracknell, Berkshire. [51] The Chorus work it was doing became the basis for the Novell "SuperNOS", a project to create a microkernel-based, UnixWare–NetWare hybrid, network operating system. [52]

Legacy

The acquisition of USL never really worked out for Novell, [45] and was followed by Novell's misguided acquisitions of WordPerfect and Quattro Pro in another attempt to compete head-to-head with Microsoft. [53] In particular, the "SuperNOS" project never achieved fruition. [54]

Novell announced the sale of Unix to the Santa Cruz Operation, coincident with a licensing arrangement with Hewlett-Packard, in September 1995. [55] Following another change of ownership, the renamed The SCO Group and the Unix System V source base became elements of the SCO–Linux disputes. [45] After The SCO Group went bankrupt, the SCO products using the Unix System V source base were purchased by UnXis, later renamed to Xinuos. [56]

Although it never took off within the industry, C++ Standard Components remained in the development kits for Novell UnixWare, later SCO UnixWare, into the 2000s. [27] Tuxedo was acquired by BEA Systems in the 1990s, and then upon that firm being acquired became part of Oracle Fusion Middleware. [57]

Novell was acquired by The Attachmate Group in 2011. The Attachmate Group was acquired by Micro Focus in 2014. Micro Focus was later acquired by OpenText in 2023.

In the view of writer Christopher Negus, "The UNIX Laboratory was considered a jewel that couldn't quite find a home or a way to make a profit. As it moved between Bell Laboratories and other areas of AT&T, its name changed several times. It is probably best remembered by the name it had as it began its spin-off from AT&T: UNIX System Laboratories (USL)." [1] However Negus believes that in three crucial respects USL's actions – in continuing to release a source code product to its partners, in working to define industry standards such as POSIX, and in making decisions on the direction of Unix based on technical merit not corporate advantage – paved the way for the rise of a Unix-like entity such as the Linux operating system, and that this beneficial historical role has been obscured by the SCO–Linux controversies. [1]

See also

Related Research Articles

<span class="mw-page-title-main">IBM AIX</span> Series of Unix operating systems from IBM

AIX is a series of proprietary Unix operating systems developed and sold by IBM for several of its computer platforms.

<span class="mw-page-title-main">Novell</span> 1980–2014 American multinational software and services company

Novell, Inc. was an American software and services company headquartered in Provo, Utah, that existed from 1980 until 2014. Its most significant product was the multi-platform network operating system known as Novell NetWare.

<span class="mw-page-title-main">SCO Group</span> Defunct American software company

The SCO Group was an American software company in existence from 2002 to 2012 that became known for owning Unix operating system assets that had belonged to the Santa Cruz Operation, including the UnixWare and OpenServer technologies, and then, under CEO Darl McBride, pursuing a series of high-profile legal battles known as the SCO-Linux controversies.

USL v. BSDi was a lawsuit brought in New Jersey federal court in 1992 by Unix System Laboratories against Berkeley Software Design, Inc and the Regents of the University of California over intellectual property related to the Unix operating system; a culmination of the Unix wars. The case was settled out of court in 1994 after the judge expressed doubt in the validity of USL's intellectual property, with Novell and the University agreeing not to litigate further over the Berkeley Software Distribution (BSD).

<span class="mw-page-title-main">Santa Cruz Operation</span> Software company based in Santa Cruz, California

The Santa Cruz Operation, Inc. was an American software company, based in Santa Cruz, California, that was best known for selling three Unix operating system variants for Intel x86 processors: Xenix, SCO UNIX, and UnixWare.

<span class="mw-page-title-main">IXI Limited</span> British company specialising in Unix software

IXI Limited was a British software company that developed and marketed windowing products for Unix, supporting all the popular Unix platforms of the time. Founded in 1987, it was based in Cambridge. The product it was most known for was X.desktop, a desktop environment graphical user interface built on the X Window System. IXI was acquired by the Santa Cruz Operation (SCO) in February 1993.

<span class="mw-page-title-main">UnixWare</span> Unix operating system

UnixWare is a Unix operating system. It was originally released by Univel, a jointly owned venture of AT&T's Unix System Laboratories (USL) and Novell. It was then taken over by Novell. Via Santa Cruz Operation (SCO), it went on to Caldera Systems, Caldera International, and The SCO Group before it was sold to UnXis. UnixWare is typically deployed as a server rather than a desktop. Binary distributions of UnixWare are available for x86 architecture computers. UnixWare is primarily marketed as a server operating system.

<span class="mw-page-title-main">UNIX System V</span> Early commercial UNIX operating system

Unix System V is one of the first commercial versions of the Unix operating system. It was originally developed by AT&T and first released in 1983. Four major versions of System V were released, numbered 1, 2, 3, and 4. System V Release 4 (SVR4) was commercially the most successful version, being the result of an effort, marketed as Unix System Unification, which solicited the collaboration of the major Unix vendors. It was the source of several common commercial Unix features. System V is sometimes abbreviated to SysV.

In a series of legal disputes between SCO Group and Linux vendors and users, SCO alleged that its license agreements with IBM meant that source code IBM wrote and donated to be incorporated into Linux was added in violation of SCO's contractual rights. Members of the Linux community disagreed with SCO's claims; IBM, Novell, and Red Hat filed claims against SCO.

<i>SCO Group, Inc. v. Novell, Inc.</i>

SCO v. Novell was a United States lawsuit in which the software company The SCO Group (SCO), claimed ownership of the source code for the Unix operating system. SCO sought to have the court declare that SCO owned the rights to the Unix code, including the copyrights, and that Novell had committed slander of title by asserting a rival claim to ownership of the Unix copyrights. Separately, SCO was attempting to collect license fees from Linux end-users for Unix code through their SCOsource division, and Novell's rival ownership claim was a direct challenge to this initiative. Novell had been increasing their investments in and support of Linux at this time, and was opposed to SCO's attempts to collect license fees from Novell's potential customers.

<span class="mw-page-title-main">OpenServer</span> Closed source version of Unix developed by SCO

Xinuos OpenServer, previously SCO UNIX and SCO Open Desktop, is a closed source computer operating system developed by Santa Cruz Operation (SCO), later acquired by SCO Group, and now owned by Xinuos. Early versions of OpenServer were based on UNIX System V, while the later OpenServer 10 is based on FreeBSD 10. However, OpenServer 10 has not received any updates since 2018 and is no longer marketed on Xinuos's website, while OpenServer 5 Definitive and 6 Definitive are still supported.

<span class="mw-page-title-main">History of Unix</span> Operating system

The history of Unix dates back to the mid-1960s, when the Massachusetts Institute of Technology, Bell Labs, and General Electric were jointly developing an experimental time-sharing operating system called Multics for the GE-645 mainframe. Multics introduced many innovations, but also had many problems. Bell Labs, frustrated by the size and complexity of Multics but not its aims, slowly pulled out of the project. Their last researchers to leave Multics – among them Ken Thompson, Dennis Ritchie, Doug McIlroy, and Joe Ossanna – decided to redo the work, but on a much smaller scale.

<span class="mw-page-title-main">Univel</span> American software company

Univel, Inc. was a joint venture of Novell and AT&T's Unix System Laboratories (USL) that was formed in December 1991 to develop and market the Destiny desktop Unix operating system, which was released in 1992 as UnixWare 1.0. Univel existed only briefly in the period between AT&T initially divesting parts of USL in 1991, and its eventual outright purchase by Novell, which completed in June 1993, thereby acquiring rights to the Unix operating system. Novell merged USL and Univel into their new Unix Systems Group (USG).

<span class="mw-page-title-main">Common Open Software Environment</span> Operating system standards initiative

The Common Open Software Environment (COSE) was an initiative formed in March 1993 by the major Unix vendors of the time to create open, unified operating system (OS) standards.

3DA was an alliance formed between The Santa Cruz Operation (SCO) and Hewlett-Packard (HP) in September 1995. Its purpose was to unify SCO's OpenServer product, UnixWare, and HP-UX from HP; the resulting product would then become the de facto Unix standard for both existing x86 systems and the upcoming IA-64 processor architecture from Intel.

Xinuos is an American software company that was created in 2011. It was first called UnXis until assuming its current name in 2013. Xinuos develops and markets the Unix-based OpenServer 6, OpenServer 5, and UnixWare 7 operating systems under SCO branding. Xinuos formerly sold the FreeBSD-based OpenServer 10 operating system.

Visionware Ltd was a British software company that developed and marketed products that helped integration of Microsoft Windows clients to Unix-based server applications. It was based in Leeds in West Yorkshire. The three products it was most known for were PC-Connect, XVision, and SQL-Retriever.

<span class="mw-page-title-main">HCR Corporation</span> Canadian software company

Human Computing Resources Corporation, later HCR Corporation, was a Canadian software company that worked on the Unix operating system and system software and business applications for it. Founded in 1976, it was based in Toronto.

<span class="mw-page-title-main">Unix Expo</span> Unix trade show in NY, NY, US (1984–1996)

Unix Expo was a conference and trade show that focused on the Unix operating system, and software based on Unix, in the information technology sector. It ran from 1984 through 1996 and was held in New York City during the autumn season. The show was owned and managed by the Blenheim Group.

Chorus Systèmes SA was a French software company that existed from 1986 to 1997, that was created to commercialise research work done at the Institut national de recherche en informatique et en automatique (INRIA). Its primary product was the Chorus distributed microkernel operating system, created at a time when microkernel technology was thought to have great promise for the future of operating systems. As such Chorus was in the middle of many strategic partnerships regarding Unix and related systems. The firm was acquired by Sun Microsystems in 1997.

References

  1. 1 2 3 4 5 Negus, Christopher (2015). Linux Bible: The Comprehensive, Tutorial Resource (Ninth ed.). Indianapolis: John Wiley & Sons. pp. 10–11.
  2. 1 2 "Signals". Signals. 1991. pp. 61–66.
  3. 1 2 3 4 5 6 7 "AT&T Renames Unix Software Unix System Laboratories" (Press release). PR Newsire. June 25, 1990. Archived from the original on January 19, 2017. Retrieved March 28, 2021.
  4. 1 2 3 4 5 "AT&T Names President Of Unix Software Operation" (Press release). PR Newswire. January 4, 1989. Archived from the original on January 19, 2017. Retrieved March 28, 2021.
  5. 1 2 3 "Technology". Los Angeles Times. December 22, 1992. Archived from the original on January 16, 2017. Retrieved March 28, 2021.
  6. ↑ Wagner, Neal R.; Putter, Paul S. (January 1989). "Error Detecting Decimal Digits". Communications of the ACM. 32 (1): 106–110. doi: 10.1145/63238.63246 . S2CID   805863.
  7. ↑ Ambrosio, Johanna (July 23, 1990). "AT&T's Unix unit spun off". Computerworld. p. 10. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  8. ↑ AUUG Conference Proceedings 1992. Australian Open Systems Users Group. Summer 1992. p. 39. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  9. 1 2 3 "History and Timeline". The Open Group. Archived from the original on April 8, 2011. Retrieved December 1, 2017.
  10. ↑ Marshall, Martin (December 18, 1989). "Hopes of Reunification Highlight Eventful Year for Unix Community". InfoWorld. p. 41. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  11. 1 2 3 Stevens, W. Richard; Rago, Stephen A. (2013). Advanced Programming in the UNIX Environment (Third ed.). Upper Saddle River, New Jersey: Addison-Wesley. pp. 32–33.
  12. ↑ Ambrosio, Johanna (October 1, 1990). "AT&T Unix to gain enhanced security". Computerworld. p. 32. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  13. ↑ Fellows, William (August 13, 1992). "Unix International reviews the Unix System V.4 story so far". Computergram International . Computer Business Review.
  14. 1 2 McCarthy, Vance; Corcoran, Cate (May 11, 1992). "Univel targets UnixWare release for early fall". InfoWorld. pp. 1, 103. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  15. ↑ "Identities: UNIX System Laboratories". WorldCat. Archived from the original on May 7, 2018. Retrieved May 6, 2018. WorldCat lists "122 works in 297 publications in 1 language and 1,849 library holdings" from USL.
  16. 1 2 "Novell completes acquisition of UNIX System Laboratories from AT&T" (Press release). Business Wire. June 14, 1993. Archived from the original on July 7, 2017. Retrieved March 28, 2021.
  17. 1 2 Khermouch, Gerry (November 25, 1991). "USL backs French firm's Microkernel". Electronic News. p. 13. Archived from the original on March 28, 2021. Retrieved March 28, 2021– via Gale General OneFile.
  18. 1 2 3 Foley, Mary Jo (June 14, 1993). "USL, Chorus outline plans for microkernel release of Unix SVR4". PC Week. p. 60. Archived from the original on March 28, 2021. Retrieved March 28, 2021– via Gale General OneFile.
  19. ↑ "An Industry Project to Progress Microkernel-based Open Operating Systems for the 1990s". Resultados de investigaciones de la UE. Community Research and Development Information Service. June 17, 1994. Archived from the original on November 30, 2020. Retrieved May 21, 2020.
  20. ↑ "Chorus Systemes takes the initiative in establishing a microkernel compatibility effort". Computergram International. Computer Business Review. June 16, 1993.
  21. ↑ Van Tyle, Sherry (October 15, 1992). "PC fault-tolerant Unix-based system runs on a modular microkernel architecture". Electronic Design. p. 34. Archived from the original on March 28, 2021. Retrieved March 28, 2021– via Gale General OneFile.
  22. ↑ Andrade, Juan M.; Carges, Mark T.; Dwyer, Terence J.; Felts, Stephen D. (1996). The TUXEDO System: Software for Constructing and Managing Distributed Business Applications . Reading, Massachusetts: Addison-Wesley. pp. xxxiii–xxxvi. ISBN   9780201634938.
  23. 1 2 Messmer, Ellen (April 15, 1991). "Novell buys into AT&T unit to gain Unix net know-how". Network World. p. 9. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  24. 1 2 3 4 5 Stroustrup, Bjarne (1994). The Design and Evolution of C++. Reading, Massachusetts: Addison-Wesley. pp. 124–125, 126–127, 184. Bibcode:1994dec..book.....S.
  25. ↑ McCluskey, Glen; Murray, Robert B. (December 1992). "Template Instantiation For C++". SIGPLAN Notices. 27 (12): 47–56. doi: 10.1145/142181.142195 . S2CID   27330199.
  26. 1 2 Carroll, Martin D.; Ellis, Margaret A. (1995). Designing and Coding Reusable C++. Reading, Massachusetts: Addison-Wesley. pp. x, 231.
  27. 1 2 "C++ Standard Components". The SCO Group. June 2, 2005. Archived from the original on September 10, 2018. Retrieved December 1, 2017. See also "Relationship to the C++ Standard Library" Archived November 25, 2020, at the Wayback Machine at the same site.
  28. 1 2 3 Leggett, Bill (June 1992). "Product Review: The USL C++ Standard Components Release 2 (end user package)". C++ Report. pp. 69–73.
  29. ↑ Alam, M. Afshar; Padenga, Tendai (2010). Application Software Reengineering. Delhi: Pearson. p. 146.
  30. 1 2 "Product History". The SCO Group. June 2, 2005. Archived from the original on September 10, 2018. Retrieved April 28, 2018.
  31. ↑ Stroustrup, Bjarne (June 2007). "Evolving a language in and for the real world: C++ 1991-2006". Proceedings of the third ACM SIGPLAN conference on history of programming languages. ACM. pp. 4-8–4-11.
  32. ↑ "Alexander A. Stepanov". stepanovpapers.com. October 6, 2016. Archived from the original on December 1, 2017. Retrieved December 15, 2017. and "No More Array Errors (Part II) - Array_alg(C++)". The SCO Group. June 2, 2005. Archived from the original on September 10, 2018. Retrieved April 28, 2018.
  33. 1 2 3 4 Ambrosio, Johanna (April 8, 1991). "AT&T's Unix sell-off won't sway OSF". Computerworld. p. 12. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  34. ↑ "Roel Pieper ist neuer Chef der USL". Computerwoche von IDG (in German). December 6, 1991. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  35. 1 2 Toomey, Warren (November 28, 2011). "The Strange Birth and Long Life of Unix". IEEE Spectrum. Archived from the original on March 14, 2021. Retrieved March 28, 2021.
  36. 1 2 Bretthauer, David (December 26, 2001). "Open Source Software: A History". University of Connecticut. Archived from the original on December 2, 2020. Retrieved March 28, 2021.
  37. ↑ Nash, Jim (December 16, 1991). "Unix Labs, Novell tighten ties". Computerworld. p. 115. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  38. ↑ "Unix Labs and Novell plan join venture, reveal bones of mass distribution alliance". Computergram International. Computer Business Review. October 24, 1991.
  39. ↑ Wylie, Margie (April 13, 1992). "Univel developing user-friendly Unix". Network World. p. 13. Archived from the original on July 26, 2020. Retrieved March 28, 2021.
  40. 1 2 "USL's Pieper readies Unix for the PC network market". InfoWorld. May 11, 1992. p. 106. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  41. 1 2 Schwartz, Evan I. (June 22, 1992). "A Unix For The Masses?". Bloomberg News. Archived from the original on June 24, 2018. Retrieved March 28, 2021.
  42. ↑ Gerber, Cheryl (September 28, 1992). "Novell sees the future in Unix; OS/2 rebuffed". InfoWorld. p. 1. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  43. 1 2 Radding, Alan (June 28, 1993). "UnixWare: Bringing shrink-wrapped Unix to the masses". InfoWorld. pp. 65–66. Archived from the original on February 27, 2017. Retrieved March 28, 2021.
  44. 1 2 3 Babcock, Charles (January 11, 1993). "Novell's long shot". Computerworld. p. 34. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  45. 1 2 3 Strom, David (November 5, 2003). "Novell Buys Unix, Again". CRN. Archived from the original on November 28, 2020. Retrieved March 28, 2021.
  46. 1 2 3 4 "Novell, Unix Labs Try to Reassure Japanese on the Merger". Computergram International. Computer Business Review. March 4, 1993.
  47. ↑ Fisher, Lawrence M. (March 29, 1992). "Preaching Love Thy Competitor". The New York Times. Archived from the original on December 23, 2019. Retrieved March 28, 2021.
  48. ↑ "Novell formally announces the Unix Systems Group". Computergram International. Computer Business Review. July 7, 1993. Archived from the original on February 16, 2020. Retrieved March 28, 2021.
  49. 1 2 "Novell Unix Official Out". The New York Times. August 31, 1993. p. 57. Archived from the original on June 24, 2018. Retrieved March 28, 2021.
  50. ↑ "News Shorts: Pieper bids adieu". Computerworld. September 6, 1993. p. 16. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  51. ↑ "Novell Continues Restructuring". Telecompaper. September 10, 1993. Archived from the original on December 3, 2020. Retrieved March 28, 2021.
  52. ↑ "Novell ready to embark on the road to object orientation". Computergram International. Computer Business Review. April 11, 1995.
  53. ↑ Fisher, Lawrence M. (February 1, 1996). "Novell to Sell Wordperfect for $115 Million". The New York Times. Archived from the original on June 22, 2019. Retrieved March 28, 2021.
  54. ↑ Politis, David L. (March 29, 2004). "Novell regaining prior glory". Deseret News. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  55. ↑ "UnixWare survives through sale, licensing deal". Network World. September 25, 1995. p. 134. Archived from the original on March 28, 2021. Retrieved March 28, 2021.
  56. ↑ "UnixWare". The OS Files. Archived from the original on January 10, 2021. Retrieved January 8, 2021.
  57. ↑ "Oracle Tuxedo". Oracle. Archived from the original on May 5, 2018. Retrieved May 5, 2018.
This page is based on this Wikipedia article
Text is available under the CC BY-SA 4.0 license; additional terms may apply.
Images, videos and audio are available under their respective licenses.