Now you've completed Netizen's Intermediate Perl module, you should be confident in your knowledge of the following fields:
File I/O, including opening files and directories, opening pipes, finding information about files, recursing down directories, file locking, and handling binary data
How to use advanced regular expression techniques such as multiline matching and backreferences
The use of various Perl functions
System interaction, including: system calls, the backtick operator, interacting with the file system, dealing with users and groups, dealing with processes, network communications, and security considerations
Advanced Perl data structures and references