Jenkins: The Definitive Guide
John Ferguson Smart
Systems Programming: Designing and Developing Distributed Applications
Richard Anthony
Automation Through Chef Opscode: A Hands-On Approach to Chef
Navin Sabharwal & Manak Wadhwa
How Linux Works: What Every Superuser Should Know
Brian Ward
Shell Scripting
Steve Parker
Learning the Bash Shell: Unix Shell Programming
Cameron Newham & Bill Rosenblatt