Perl Pitfalls and Best Practices: What to Avoid

Perl is a highly flexible language, but its permissive nature can easily lead to silent bugs, security vulnerabilities, and unmaintainable code. To write professional Perl today, you must know not only what features to use, but also which legacy habits to avoid. This text-only course guides you through identifying outdated programming patterns and replacing them with modern, secure, and efficient Perl practices. You will learn to recognize common traps and refactor your scripts for maximum reliability. What you'll learn: Understand how to enforce safe coding standards using strictures and modern warning pragmas; Avoid risky file-handling techniques by replacing legacy syntax with secure, lexical alternatives; Recognize the limitations of regular expressions and avoid using them to parse complex structured data; Refactor unsafe global variables into properly scoped lexical variables and modern data structures; Identify deprecated modules and learn to adopt modern library ecosystems for web and data tasks; Apply defensive programming principles to sanitize inputs and handle runtime errors gracefully. The course begins with foundational concepts of code safety, followed by side-by-side written explanations of bad practices and their modern solutions. You will finish with a clear understanding of how to audit and improve any Perl codebase. This course is perfect for beginners who want to build correct habits from the start, as well as developers looking to update their legacy Perl knowledge. No prior advanced programming experience is necessary. Start reading now to master clean, modern Perl development.