1 “...Shell scripting skills never go out of style. It's the shell that unlocks the real potential...”

2 “... (areas to watch out for when programming), and devotes two full ch...”

3 “.... It ships with all BSD and GNU/Linux systems, and compiles and works "out of the box" on just about every...”

4 “... print it out or read it on the screen, this PDF gives you the answers to the annoying questions...”