Red Hat Enterprise Linux 6 Administration
Sander van Vugt
Vi IMproved--VIM
Steve Oualline
Metasploit for Beginners
Sagar Rahalkar
Advanced Penetration Testing
Wil Allsopp
Beginning Modern Unix
Manish Jain
Accelerating Development Velocity Using Docker
Kinnary Jangla
Using and Administering Linux: Volume 1
David Both
Hands-on Booting
Yogesh Babar