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Script Name Perl 101 (Part 5) - Sub-Zero Code This Part 5 of the Perl 101 series introduces you to subroutines and teaches you how to structure your code for maximum reusability. Also included: return values, my() and local() constructs, and a marriage proposal. Common Beginners Mistakes This is a list of common mistakes that people make when writing Perl scripts and suggestions on how to fix them. Included are general help tips on how to debug - very important particularly for beginners at programming. This list is based on the author's personal experience and complaints found on newsgroups/message boards. Common Server Errors and Messages Find out what those server response codes like 401, 404, 500 mean. It can help you troubleshoot minor problems - knowing these are a must if you'll be working on programs that run on a server. Debugging CGI Scripts 101 These are a few guidelines to help you solving problems with your CGI Script. Topics include: Short overview of the CGI calling process, Server Errors - The server fails to execute the CGI, Logical Errors (Errors in the program flow), and more. Configuring CGI Scripts This tutorial tackles one of the most common newbie questions, how to install your regular joe CGI Script. Debugging CGI Scripts Hints and tips on debugging Perl CGI scripts and identifying some possible causes of server errors. User Info This note describes how to get information about a remote user from within a CGI-bin script, and lists the information available. CGI Environmental Variables One of the methods that the web server uses to pass information to a cgi script is through environmental variables. These are created and assigned appropriate values within the environment that the server spawns for the cgi script. This page highlights some of the most commonly used ones, along with a brief description and notes on possible uses for them. Printing all CGI environment variables This article provides a short CGI program that can print every environment variable it knows. Sorting Techniques An introduction to sorting, and how to write your own sorting functions easily with perl. Includes some very common examples of sorts.

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