Perl-Fundamentals

Hello World in Perl

Perl has been printing “Hello, World!” since 1987. As a language designed for practical text manipulation, outputting text is as simple as it gets.

The Code

Create a file named hello.pl: …

Variables and Types in Perl

Perl’s approach to variables is unique among programming languages. Instead of declaring a type, you prefix each variable with a sigil—a symbol that tells Perl (and you) what kind of data …

Operators in Perl

Operators are the building blocks of every expression you’ll write in Perl. Because Perl is dynamically typed with weak conversions between numbers and strings, it takes a route no other …

Control Flow in Perl

Control flow determines the order in which your program’s statements run. Perl gives you the familiar if/elsif/else conditionals and while/for loops you’d expect, but it also adds its own …

Functions in Perl

In Perl, functions are called subroutines, defined with the sub keyword. As a multi-paradigm language that borrows heavily from Lisp, Perl treats subroutines as first-class values: you can store them …

I/O Operations in Perl

Perl was born from the need to shuffle text between programs, files, and terminals, so input and output are woven deep into the language. You have already used print to say “Hello, World!” …