We study Perl

Known as a "book with Lama", this textbook, first published in 1993, is already the fifth edition, which describes the latest changes in the language up to the version of Perl 5.10.
The fifth edition includes topics such as data types and variables, user functions, file operations, regular expressions, operations with strings, lists and sorting, processes management, smart comparisons, third-party developer modules and others.
Perl is a language for those who want to quickly and effectively perform their work. Once created as a tool for complex text processing, designed for system administrators, now Perl is a full-featured programming language suitable for solving almost any tasks on almost any platform - from short service programs that fit on the command line to the tasks of web programming, research in Areas of bioinformatics, financial calculations and many other things.
Other books teach you to program on Perl, while the book "Learning Perl" will make a Perl programmer from you