Programming Perl, Paperback by Christiansen, Tom; Foy, Brian D.; Wall, Larry; Orwant, Jon (CON), ISBN 0596004923, ISBN-13 9780596004927, Brand New, Free shipping in the US Introduces the programming language to beginners and provides a Perl language reference for experienced users, covering operators, statements, formats, modules, objects, threads, tied variables, debugging, and security.