There comes a time in many a complex system when it is useful to call one Perl file from another. In my case, a Perl script creating a list of IT accounts to be created had to be called from two distinct places - our PHP online application to use IT facilities, and our Perl admissions administrative interface.
For the PHP page, I created a shell script calling the file in a PHP-bin (it is better for security apparently):
exec("/home/httpd/php-bin/filename.shell");
For the Perl, because it is already in a passworded area of our site, I just call the file directly:
system("/usr/bin/perl /home/httpd/yourpath/directory/filename.perl");
