Sams Teach Yourself Perl in 24 Hours (3rd Edition)

HOUR 9 More Functions and Operators

HOUR 10 Files and Directories

HOUR 11 System Interaction

HOUR 12 Using Perl's Command-Line Tools

HOUR 13 References and Structures

HOUR 14 Using Modules

HOUR 15 Finding Permanence

HOUR 16 The Perl Community