[Blind-sysadmins] Setting up virtual machines via the command line?

Hi, Sometimes if I am working from home it would be good to set up a VM on my machine at work, so it's there when I go to the office, and I don't have to copy it and take it in on a USB drive etc. I'm currently using a Mac with VMWare fusion. Is there a tool to set up and run VMs from the command line, that I could install on my Mac and use after SSHing in? Cheers, Jen.