Unless you actually mean Net::FTP, this is not a Perl question, and thus outside the scope of this site. Asking a question like this, particularly as briefly as you have phrased it, and not connecting it to a Perl need, is poor form and a very good way to get a whole bunch of downvotes.

This is particularly egregious as if I literally type your question into Google: What is the FTP command to send a file from one server to a different server? I get useful results. Keep in mind that you will log into one server, likely via ssh, and then connect via the FTP protocol to your second server.