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J. Clark Scott
The Linux Command Line, 2nd Edition
William Shotts
Attacking Network Protocols
James Forshaw
Linux in a Nutshell
Ellen Siever & Stephen Figgins & Robert Love & Arnold Robbins
Learning the Vi and Vim Editors
Arnold Robbins & Elbert Hannah
grep Pocket Reference
John Bambenek & Agnieszka Klus
Docker: Up & Running
Sean P. Kane & Karl Matthias