- UNIX and Linux System Administration Handbook, 5th Ed. - Evi Nemeth et al. - 2017 - The definitive guide to installing, configuring, and maintaining Unix/Linux systems.
- The Linux Programming Interface - Michael Kerrisk - 2010 - Comprehensive reference for Linux/UNIX system programming; 1,500+ pages.
- The Linux Command Line, 2nd Ed. - William Shotts - 2019 - The best introduction to Bash and the Unix philosophy — free online.
- Practical Linux System Administration - David Clinton - 2023 - User maintenance, backups, storage, networking, and troubleshooting.
- A Practical Guide to Linux Commands, Editors, and Shell Programming - Mark G. Sobell - 2018 - Commands, editors, shell programming, and security practices.