Ansible: Up and Running
Bas Meijer & Lorin Hochstein & Rene Moser
Intermediate Perl: Beyond the Basics of Learning Perl
Randal L. Schwartz & Tom Phoenix & Brian D Foy
Real-World Bug Hunting: A Field Guide to Web Hacking
Peter Yaworski
Hadoop: The Definitive Guide
Tom White
grep Pocket Reference
John Bambenek & Agnieszka Klus