sed & awk
Dale Dougherty & Arnold Robbins
Docker Deep Dive
Nigel Poulton
Hacking Linux
Phil J Hack
Linux iptables Pocket Reference
Gregor N. Purdy
Linux Advanced Routing and Traffic Control HOWTO
Gregory Maxwell & Remco Mook & Martijn Oosterhout & Paul Schroeder & Jasper Spaans & Bert Hubert