Perl
Perl is a highly capable, feature-rich programming language with over 29 years of development.
Site: https://www.perl.org/
Books
Perl introductory course
Introductory course for Perl 5 through examples, geared towards VLSI engineers.
Modern Perl
Modern Perl teaches you how Perl really works. It's the only book that explains Perl thoroughly, from its philosophical roots to the pragmatic decisions that help you solve real problems—and keep them solved.
Higher-Order Perl
Higher-Order Perl is about functional programming techniques in Perl. It's about how to write functions that can modify and manufacture other functions.