SSH Mastery: OpenSSH, PuTTY, Tunnels and Keys (IT Mastery Book 1)
Network Security with OpenSSL: Cryptography for Secure Communications
How Linux Works: What Every Superuser Should Know
Production-Ready Microservices: Building Standardized Systems Across an Engineering Organization
A Concise Guide to SSL/TLS for DevOps: 2nd Edition
Fluent Python: Clear, Concise, and Effective Programming
Mastering Regular Expressions: Understand Your Data and Be More Productive
Nmap 6 Cookbook: The Fat-Free Guide to Network Security Scanning
DNS and BIND: Help for System Administrators
Learning the bash Shell: Unix Shell Programming (In a Nutshell (O'Reilly))