The title of this chapter is misleading—by design, too. The word “advanced” usually is taken to mean “difficult to understand” and/or “not essential”. This chapter is neither of those—the whole chapter is easy to understand, and the first half is essential to understand as well.
While you can write elementary scripts with the material presented in Chapter 2 (“Essential Unix Commands and Terminology”) and Chapter 3 (“Bourne Shell Scripting”), sooner than later you will find your code becoming inelegant, or you might even hit a roadblock. This chapter gives you the remaining ...
