SSH, The Secure Shell: The Definitive Guide

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))