Linux & UNIX Admin
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Design and Implementation of the FreeBSD Operating System, the
Unix and Linux
Professional Xen Virtualization
Mastering Unix Shell Scripting
Opensolaris Bible
Understanding Linux Network Internals
Practical UNIX and Internet Security
High Performance Linux Clusters With OSCAR, Rocks, Openmosix, and MPI
Classic Shell Scripting
Mastering FreeBSD and OpenBSD Security
Linux System Administration
Unix in a Nutshell
Linux Networking Cookbook
Ubuntu Hacks
Linux Essentials
Linux Bible
LPI Linux Essentials Study Guide
Linux Command Line and Shell Scripting Bible
Ubuntu Linux Bible
Linux All-in-one for Dummies
CompTIA Linux+ Study Guide
Learning Unix for OS X
Bash Cookbook
Python for Devops
Practical Forensic Imaging
Learn Linux in a Month of Lunches
Learn Powershell in a Month of Lunches, Fourth Edition
Podman in Action
Linux in Action
How Linux Works, 3rd Edition
Effective Shell
The Linux Command Line, 3rd Edition