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Larry Arnold Wall (born September 27, 1954) is an American computer programmer, linguist, and author known for creating the Perl programming language and the patch tool.
While in graduate school at the University of California, Berkeley, Wall and his wife were studying linguistics with the intention of finding an unwritten language, perhaps in Africa, and creating a writing system for it. They would then use this new writing system to translate various texts into the language, among them the Bible. For health reasons these plans were cancelled, and they remained in the United States, where Wall instead joined the NASA Jet Propulsion Laboratory after he finished graduate school.
Wall developed the Perl language and interpreter while working for System Development Corporation, which later became part of Burroughs and then Unisys. He is the co-author of Programming Perl (often referred to as the Camel Book and published by O'Reilly), which is the definitive resource for Perl programmers; and edited the Perl Cookbook. He then became employed full-time by O'Reilly Media to further develop Perl and write books on the subject.
Wall's training as a linguist is apparent in his books, interviews, and lectures. He often compares Perl to a natural language and explains his decisions in Perl's design with linguistic rationale. He also often uses linguistic terms for Perl language constructs, so instead of traditional terms such as "variable", "function", and "accessor" he sometimes says "noun", "verb", and "topicalizer".
Wall's Christian faith has influenced some of the terminology of Perl, such as the name itself, a biblical reference to the "pearl of great price" (Matthew 13:46). Similar references are the function name bless, and the organization of Raku (previously known as Perl 6) design documents with categories such as apocalypse and exegesis. Wall has also alluded to his faith when speaking at conferences, including at the Perl Conference 3.0 on August 23, 1999.
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