$ VBoxManage list vms
$ VBoxHeadless -s "FreeBSD-10.1-RELEASE-amd64"
$ VBoxManage startvm "VM name" --type headless
More information
VBoxManage list ostypes
Created: (4 years ago)
$ VBoxManage list vms
$ VBoxHeadless -s "FreeBSD-10.1-RELEASE-amd64"
$ VBoxManage startvm "VM name" --type headless
VBoxManage list ostypes