For a program that runs successfully elsewhere I am receiving the error "Undefined subroutine &main::param called at (my piping/location and the name of the perl program)" on Perl

You have not shown us the source code of this program - that makes it almost impossible to say what is wrong. Best guess is that you have forgotten to include the line:

use CGI ':standard';
[download]

I'm sure you are aware that your versions of O/S, Apache and Perl are very, very old now. On dedicated hardware there's maybe not much you can do about that but it is likely to cause you more problems that using more recent releases.

An analogy for the OP: Imagine taking your car in to a mechanic, telling them what make it is and what model of spark plugs it has in it, then expecting them to tell you why the check engine light is on solely on that basis . . .

The cake is a lie.
The cake is a lie.
The cake is a lie.

My guess is you either haven't installed all necessary files or your path settings are wrong, such that the "elsewhere" available code defining the function main::param() is never imported/required/executed.

update

on a side note: using apache for that sounds like overkill, many apps allow bundling a built-in webserver. Like some build with the Mojolicious framework.

G'day mbcc,

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