Most likely, what you are looking for is information on the Common Gateway Interface, commonly known as CGI.

You have many things to learn, before you can successfully implement the functions you seem to require in your script (which will need to be re-designed, because , when you serve data over the web, there is no traditional STDIN. You will use web forms, instead.)

A long, but enjoyable journey, well worth the effort.

Update: To allow for the low probability that you meant client-side perl scripting, the reference is : Scripts - Animated Documents and Smart Forms.