Want to set up autolearn on spambox

I want to set up spamassassin to learn about all the spam that isn’t already classified in my .spam folder from a cronjob, and then clean out those messages. Basically, if i move spam I find in my inbox to my spam box, I hope that Spamassassin will learn about it for next time a similar one comes by.

I logged into my account via SSH to start making a script, but the salearn command does not seem to be available to users of a virtualserver.

Does anyone know of a good way about getting spamassassin to learn spammy mails automatically based on their location in my mailbox? What does the "Report as Spam" button use?