Beginning Unix
NetBSD for Beginners: A Step-by-Step Guide to Installing, Configuring, and Optimizing NetBSD for Performance and Security
Introduction to Data Science: Data Wrangling and Visualization with R (Chapman & Hall/CRC Data Science Series)
The Terminal Ninja: Mastering macOS Command Line and Zsh Scripting from Beginner to Advanced
Unix in 24 Hours, Sams Teach Yourself: Covers OS X, Linux, and Solaris
Bash in easy steps
Efficient Linux at the Command Line: Boost Your Command-Line Skills
Ubuntu: The Complete Reference