To debug a program

[Jessie]

I have scripts that are not exceuting on Apache. I had posted this before,
.. but they are not working under a configured Apache either.

 I'm not very familiar with cgi-scripting.  So I can debug this, how
 can I pass the argumens (user + passwd) to nlogin.pl from a shell?
 (i.e. so I can run nlogin.pl from a shell and debug what's going on).