What is a CGI-script
Just so you know what you are actually dealing with, a brief introduction of what a CGI-script actually is, might be a good place to start. First of all, CGI is not a programming language. CGI is short for Common Gateway Interface, and it is a way for programs and scripts on the web-server to communicate with the web-browser (easily explained).
Usually a CGI-script is made with Perl, which is an interpreted scripting language, very common on the UNIX operation system. However, CGI-scripts may be written in any language, C++ for example (but then it should be called a CGI-program, because it is compiled and no longer a script).
In this tutorial we will deal with CGI-scripts made with Perl (which is the most common language used for CGI-scripts). Such a script is simply just a text file with a filename ending with .pl or .cgi.
An important aspect to remember is that CGI-scripts are server side scripts, meaning the scripts are executed on the server and only the results (the output) of the script is shown in the webbrowser. Compare it to JavaScript, where the actual script is downloaded within an HTML page and executed in the user is browser (client side script).
Requirements
The first thing to check when you are thinking about using a CGI-script on your homepage, is to make sure your web host company support CGI-scripts and that you have permission to use them. If you have noticed a directory called cgi-bin when you are uploading your HTML files, then you most certainly are able to use CGI-scripts.
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