Day 3, "Understanding Scalar Values," teaches you about integers,
floating-point numbers, and character strings. It also shows you that all
three are interchangeable in Perl.
Day 4, "More Operators," tells you all about operators and expressions in
Perl and talks about operator associativity and precedence.
Day 5, "Lists and Array Variables," introduces you to lists, which are
collections of values, and to array variables, which store lists.
Day 6, "Reading from and Writing to Files," tells you how to interact
with your file system by reading from input files, writing to output files,
and testing for particular file attributes.
Day 7, "Pattern Matching," describes pattern-matching in Perl and shows
how you can substitute values and translate sets of characters in text
strings.
By the end of Week 2, you'll have mastered almost all the features of Perl; you'll also
have learned about many of the library functions supplied with the language. Here's a
summary of what you'll learn:
Day 8, "More Control Structures," discusses the control flow
statements not previously covered.
Day 9, "Using Subroutines," shows how you can break your program into
smaller, more manageable, chunks.
Day 10, "Associative Arrays," introduces one of the most powerful and
useful constructs in Perl-arrays-and it shows how you can use these arrays
to simulate other data structures.
Day 11, "Formatting Your Output," shows how you can use Perl to
produce tidy reports.
Day 12, "Working with the File System," shows how you can interact with
your system's directory structure.
Day 13, "Process, String, and Mathematical Functions," describes the
library functions that interact with processes running on the system. It
also describes the functions that perform trigonometric and other
mathematical operations, and the functions that operate on strings.