Sounds like you're trying to run a CGI.pm module from the command line. Basically, if you're not passing any variables into the script, just hit CTRL+D to signal EOF. If you need to pass parameters to the script, put them as variable=value format, one per line.

Incidentally, you would pass variables to the file if your url looks like http://some.url/cgi.pl?variable1=value&variable2=value

-marius