As has been said ad nauseam, much of the complex functionality of Perl is beyond the scope of this book; the Camel Book is fat and thick, and we couldn't possibly do it justice here. As you continue your webmaster and Linux experience, you will want to learn more about Perl or a similar scripting languageyou'll certainly be exposed to it peripherally in scripts, installation packages, and more. Among the topics we didn't cover, the following might be of interest:
Special variables, especially $_
Reading input with <>
Assignable lists
Slices
String functions such as index(), rindex(), substr(), and length()
References and complex data types