The following paths are commonly needed by scripts.

Path to perl :
/usr/bin/perl

Path to sendmail :
/usr/sbin/sendmail

CGI URL :
http://www.yourdomain.com/cgi-bin/script.cgi

Subdomain CGI URL :
http://subdomain.yourdomain.com/cgi-bin/script.cgi

Path to cgi-bin :
/home/username/domains/yourdomain.com/public_html/cgi-bin

Path to cgi-bin (subdomain):
/home/username/domains/yourdomain.com/public_html/subdomain/cgi-bin