Linux Command Line and Shell Scripting Bible
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Getting Started With oVirt 3.3
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Building Applications on Mesos
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Hacking VoIP: Protocols, Attacks, and Countermeasures
Himanshu Dwivedi
Python Pocket Reference: Python in Your Pocket
Mark Lutz
Ruby Under a Microscope: An Illustrated Guide to Ruby Internals
Pat Shaughnessy