CGI question

I have some questions about CGI scripting. I would like to write an app where I can build a command that I would send to my server over the web and have the information stored in a database. I have been reading a book on cgi programming and I would like to know: Do you have to build a script that resides on the server that will processes the command line that you are sending to the server; and how do you write a command line and where do you put it?

Well, I'm not an expert and I can't remember,
but I reckon yes, you do
have to put a .cgi script on the server.
Put go.cgi in your cgi-bin directory, and send
a request to:
http://your_website/cgi-bin/go.cgi?input=blah
When the webserver gets the request, it'll
execute go.cgi.
In go.cgi you get the (input,blah) pair with the CGI module like
$blah = $cgi->Get("input");
(or maybe it's a hash table: $blah = $cgi("input");)
or something
and then you write something like
if($blah == ...) etc. in go.cgi to process it
and dump stuff in a database.

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