Malcolm Douglas McIlroy
McIlroy at the Japan Prize Foundation in 2011
|Born||1932 (age 87–88)|
|Alma mater||Cornell University (B.S., 1954)|
Massachusetts Institute of Technology (Ph.D., 1959)
|Known for||Macros, Unix pipelines, Unix philosophy, software componentry, echo, diff, sort, join, tr|
|Fields||computer science, mathematics, engineering|
|Thesis||On the Solution of the Differential Equations of Conical Shells (1959)|
|Doctoral advisors||Eric Reissner|
Malcolm Douglas McIlroy (born 1932) is a mathematician, engineer, and programmer. As of 2019 he is an Adjunct Professor of Computer Science at Dartmouth College. McIlroy is best known for having originally proposed Unix pipelines and developed several Unix tools, such as spell, diff, sort, join, graph, speak, and tr. He was also one of the pioneering researchers of macro processors and programming language extensibility. He participated in the design of multiple influential programming languages, particularly PL/I, SNOBOL, ALTRAN, TMG and C++.
McIlroy earned his Bachelor's degree in engineering physics from Cornell University, and a Ph.D. in applied mathematics from MIT in 1959 for his thesis On the Solution of the Differential Equations of Conical Shells (advisor Eric Reissner). He taught at MIT from 1954 to 1958.
McIlroy joined Bell Laboratories in 1958; from 1965 to 1986 was head of its Computing Techniques Research Department (the birthplace of the Unix operating system), and thereafter was Distinguished Member of Technical Staff.
He has previously served the Association for Computing Machinery as national lecturer, Turing Award chairman, member of the publications planning committee, and associate editor for the Communications of the ACM, the Journal of the ACM, and ACM Transactions on Programming Languages and Systems. He also served on the executive committee of CSNET.
Research and contributions
McIlroy is considered to be a pioneer of macro processors. In 1959, together with Douglas E. Eastwood of Bell Labs, he introduced conditional and recursive macros into popular SAP assembler, creating what is known as Macro SAP. His 1960 paper was also seminal in the area of extending any (including high-level) programming languages through macro processors. These contributions started the macro-language tradition at Bell Labs ("everything from L6 and AMBIT to C"). McIlroy's macro processing ideas were also the main inspiration for TRAC macro processor.
Contributions to Unix
Throughout the 1960s and 1970s McIlroy contributed programs for Multics (such as runoff) and Unix operating systems (such as diff, echo, tr, join and look), versions of which are widespread to this day through adoption of the POSIX standard and Unix-like operating systems. He introduced the idea of Unix pipelines. He also implemented TMG compiler-compiler in PDP-7 and PDP-11 assembly, which became the first high-level programming language running on Unix, prompting development and influencing Ken Thompson's B programming language and Stephen Johnson's Yacc parser-generator.
McIlroy also took over from Dennis Ritchie compilation of the Unix manual "as a labor of love". According to Sandy Fraser: "The fact that there was a manual, that he [McIlroy] insisted on a high standard for the manual, meant that he insisted on a high standard for every one of the programs that was documented".
Computer language design
McIlroy influenced the design and implementation of SNOBOL programming language. His string manipulation macros were used extensively in the initial SNOBOL implementation of 1962, and figured prominently in subsequent work, eventually leading to its machine-independent implementation language SIL. The table type (associative array) was added to SNOBOL4 on McIlroy's insistence in 1969.
In 1960s, he participated in the design of PL/I programming language. He was a member of the IBM–SHARE committee that designed the language and, together with Robert Morris, wrote the Early PL/I (EPL) compiler in TMG for the Multics project.
Awards and recognition
In 1995, he was elected as a Fellow of the American Association for the Advancement of Science. In 2004, he won both the USENIX Lifetime Achievement Award ("The Flame") and its Software Tools User Group (STUG) award. In 2006, he was elected as a member of the National Academy of Engineering.
Views on computing
McIlroy is attributed the quote "The real hero of programming is the one who writes negative code," where the meaning of negative code is taken to be similar to the famous Apple developer team anecdote (i.e., when a change in a program source makes the number of lines of code decrease ('negative' code), while its overall quality, readability or speed improves).
- "STUG Award". USENIX. Retrieved February 5, 2020.
- Bown, Rodney L., ed. (2–5 June 1986). "First International Conference on Ada (R) Programming Language Applications for the NASA Space Station, volume 2 - NASA-TM-101202" (PDF).CS1 maint: date format (link)
- McIlroy, Malcolm Douglas (January 1969). "Mass produced software components" (PDF). Software Engineering: Report of a conference sponsored by the NATO Science Committee, Garmisch, Germany, 7–11 Oct. 1968. Scientific Affairs Division, NATO. p. 79.
- Endres, Albert; Rombach, H. Dieter (2003). A Handbook of Software and Systems Engineering: Empirical Observations, Laws, and Theories. Pearson Education. p. 327.
- "Douglas McIlroy". Unknown parameter
- "M. Douglas (Malcolm) McIlroy". Mathematics Genealogy Project. Retrieved February 7, 2020.
- Layzell, P. (1985). "The History of Macro Processors in Programming Language Extensibility". The Computer Journal. 28 (1): 29–33. doi:10.1093/comjnl/28.1.29.
- David Walden (2014). "Macro memories, 1964–2013" (PDF). TUGboat. 35 (1).
- Krishnamurthi, Shriram; Felleisen, Matthias; Duba, Bruce F. (2000). Czarnecki, Krzysztof; Eisenecker, Ulrich W. (eds.). "From Macros to Reusable Generative Programming" (PDF). Generative and Component-Based Software Engineering. Lecture Notes in Computer Science. Berlin, Heidelberg: Springer. 1799: 105–120. doi:10.1007/3-540-40048-6_9. ISBN 978-3-540-40048-6. Archived from the original (PDF) on November 25, 2004.
- Holbrook, Bernard D.; Brown, W. Stanley. "Computing Science Technical Report No. 99 – A History of Computing Research at Bell Laboratories (1937–1975)". Bell Labs. Archived from the original on September 2, 2014. Retrieved February 2, 2020.
- "Macro SAP – Macro compiler modification of SAP". Archived from the original on August 13, 2008. Unknown parameter
- "Bell SAP – SAP with conditional and recursive macros". Archived from the original on August 21, 2007. Unknown parameter
- Mooers, C.N.; Deutsch, L.P. (1965). "TRAC, A Text-Handling Language". Proceeding ACM '65 Proceedings of the 1965 20th national conference. pp. 229–246. doi:10.1145/800197.806048.
- Cole, A. J. (1981). Macro Processors (2nd, revised ed.). CUP Archive. p. 254.
- Hall, A.D., "The ALTRAN System for Rational Function Manipulation — A Survey". Communications of the ACM, 14(8):517–521 (August 1971).
- McIlroy, M. D. (1987). A Research Unix reader: annotated excerpts from the Programmer's Manual, 1971–1986 (PDF) (Technical report). Computing Science. AT&T Bell Laboratories. 139.
- Ritchie, Dennis M. (1984). "The Evolution of the Unix Time-sharing System". AT&T Bell Laboratories Technical Journal. 63 (6 Part 2): 1577–93. doi:10.1002/j.1538-7305.1984.tb00054.x. Archived from the original on 6 May 2010. As PDF
- Johnson, Stephen C. (1975). Yacc: Yet Another Compiler-Compiler (Technical report). Murray Hill, New Jersey: AT&T Bell Laboratories. 32. Retrieved 31 January 2020.
- "The Creation of the UNIX Operating System". Bell Labs. Archived from the original on September 14, 2004.
- Griswold, Ralph (1978). "A history of the SNOBOL programming languages". ACM SIGPLAN Notices. ACM. 13 (8): 275–308. doi:10.1145/960118.808393. ISSN 0362-1340. S2CID 5413577.
- Lawson, Harold; Bromberg, Howard (June 12, 1997). "The World's First COBOL Compilers". Archived from the original on June 4, 2004.
- Michael S. Mahoney (18 August 1989). "Interview with M.D. McIlroy". Princeton.edu. Murray Hill.
- R. A. Frieburghouse. "The Multics PL/1 Compiler". Multicians.org.
- Tom Van Vleck (ed.). "The Choice of PL/I". Multicians.org.
- Stroustrup, Bjarne. "A History of C++: 1979−1991" (PDF).
- Jon L. Bentley; M. Douglas McIlroy (November 1993). "Engineering a sort function". Software—Practice & Experience. 23 (11).
- Narsingh Deo (1974). Graph Theory with Applications to Engineering and Computer Science. Prentice-Hall. p. 480.
- "Elected Fellows: Listing of Fellows who are current members". aaas.org. American Association for the Advancement of Science.
- "Flame Award". USENIX. Retrieved February 5, 2020.
- "Dr. M. Douglas McIlroy". nae.edu. National Academy of Engineering. Retrieved February 5, 2020.
- These quotes were heard during a talk he gave to the DLSLUG 12/3/09
- "MacPaint and QuickDraw Source Code". Computer History Museum.
|Wikiquote has quotations related to: Doug McIlroy|
- Doug McIlroy's homepage (archive homepage at Bell Labs website)
- Doug McIlroy Facts
- McIlroy's History of Unix speech (audio), includes many autobiographical notes, along with discussion of many of the major Unix authors
- Ancestry of Linux - How the Fun Began, presentation November 2005: (presentation) (audio) (video)
- Original unix spell source code, written by Doug McIlroy
- Publications by M. D. McIlroy - https://www.cs.dartmouth.edu