Wireshark Fundamentals
Vinit Jain
Building Secure and Reliable Systems
Heather Adkins & Betsy Beyer & Paul Blankinship & Piotr Lewandowski & Ana Oprea & Adam Stubblefield
Mastering Linux Network Administration
Jay LaCroix
Learning Shell Scripting with Zsh
Gastón Festari
Bash Idioms: Write Powerful, Flexible, Readable Shell Scripts
Carl Albing & J P Vossen