Linux Essentials

Sybex

LPI Linux Essentials Study Guide: Exam 010 v1.6  

Bruhaspathi

Linux Essentials for Absolute Beginners: Your First Steps into the Command Line (English Edition)

The Complete Guide to the LPI Linux Essentials Certification Exam: Pass the LPI 010-160 Exam with Confidence (English Edition)

Linux Essentials : A Book that every Linux Beginners should read (Linux from Scratch 1) (English Edition)

Sybex

Linux Essentials (English Edition)              

[PWP]

Linux: Essentials (Grundlagen der Informatik in Ausbildung, Studium und Beruf) (German Edition)

Independently published

Linux Essentials for Hackers: Learn to Hack with Linux Command Line

O'Reilly Media

Linux Guide: Essential Commands                  

Independently published

Kali Linux Essentials: A Practical Manual for Penetration Testing and Digital Forensics.

Packt Publishing

Embedded Linux Essentials Handbook: Build embedded Linux systems and real-world apps with Yocto, Buildroot, and RPi (English Edition)