Learning Perl, also known as the llama book, is a tutorial book for the Perl programming language, and is published by O'Reilly Media. The first edition (1993) was authored solely by Randal L. Schwartz, and covered Perl 4. All subsequent editions have covered Perl 5. The second (1997) edition was coauthored with Tom Christiansen and the third (2001) edition was coauthored with Tom Phoenix. The fourth (2005), fifth (2008), sixth (2011), and seventh (2016) editions were written by Schwartz, Phoenix, and brian d foy. According to the 5th edition of the book, previous editions have sold more than 500,000 copies.Unlike Programming Perl, this book is aimed at computer programmers new to Perl. The publisher offers a complete set of code examples presented in the 3rd Edition book.Schwartz selected the world of The Flintstones for the examples in this book, giving rise to the somewhat frequent use of Fred and Barney as metasyntactic variables, rather than the classic foo and bar. Source: Wikipedia (en)