If you're working with a CGI you should get a whole bunch of information sent as environmental variables.

One of them will be SCRIPT_NAME.

Another useful one would be REQUEST_URI.

See what your webserver (apache probably) will send to your script save the following as a CGI script and try calling it:

#!/usr/bin/perl
print "Content-type: text/html\n\n";

foreach my $key ( keys %ENV )
{
   print $key . " " . $ENV{$key} . "<br />\n";
}
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