Apache Solr Beginner's Guide
Alredo Serafini
Apache Solr High Performance
Surendra Mohan
The UNIX Programming Environment
Brian Wilson Kernighan & Rob. Pike
Buffer Overflow Attacks: Detect, Exploit, Prevent
Vitaly Osipov
Learning the Bash Shell: Unix Shell Programming
Cameron Newham & Bill Rosenblatt
Shell Scripting
Steve Parker