Now you've completed Netizen's Introduction to Perl module, you should be confident in your knowledge of the following fields:
What is Perl? Perl's features; Perl's main uses; where to find information about Perl online
Creating Perl scripts and running them from the Unix command line, including the use of the -w flag to enable warnings
Perl's three main variable types: scalars, arrays and hashes
The strict pragma, lexical scoping, and their benefits
Perl's most common operators and functions, and their use
Perl's concept of truth; existence and definedness of variables
Conditional and looping constructs: if, while, foreach and others.
Regular expressions: the matching and substitution operators; simple metacharacters; quantifiers; alternation and grouping