Iptables Tutorial 1.2.2
Oskar Andreasson
sed & awk
Dale Dougherty & Arnold Robbins
Ethical Hacking
Elijah Lewis
Mastering Linux Network Administration
Jay LaCroix
Cross-Site Scripting Attacks: Classification, Attack, and Countermeasures
B. B. Gupta and Pooja Chaudhary
The Cybersecurity Self-Help Guide
ARUN. SONI