Tom Christiansen (also nicknamed "tchrist") is a well-known Unix developer and user especially known for his many contributions to the Perl programming language. He was the author of much of the core Perl documentation, including the perlfaq, perltoot, and many other contributions. In 1999, he was one of the original recipients of the White Camel Awards from Perl Mongers for his contribution to Perl's documentation. Unix or UNIX is a computer operating system originally developed in the 1960s and 1970s by a group of AT&T Bell Labs employees including Ken Thompson, Dennis Ritchie, and Douglas McIlroy. ... Perl, also Practical Extraction and Report Language (a backronym, see below) is a dynamic procedural programming language designed by Larry Wall and first released in 1987. ... Perl Mongers is part of The Perl Foundation and provides services to Perl user groups. ...
Christiansen was one of the first contributors to Perl since its public release in 1987. He co-authored The Perl Cookbook, the second and third editions of Programming Perl, and the second edition of Learning Perl (and its spin-off Learning Perl on Win32 Systems). Programming Perl book cover Programming Perl, best known as the camel book among hackers, is a book about writing programs or scripts using the Perl programming language. ... Learning Perl book cover Learning Perl, also known as the llama book, is a tutorial book for the Perl programming language, and is published by OReilly. ...
Christiansen wrote "Csh Programming Considered Harmful" about the limitations inherent in C Shell Programming. The C shell (csh) is a Unix shell developed by Bill Joy for the BSD Unix system. ...
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