VirtualBox

Commands

VBoxManage list
VBoxManage list runningvms
VBoxManage startvm <id>
VBoxManage startvm <id> --type headless
VBoxManage controlvm <id> stop

# Change relative VM time
VBoxManage modifyvm <id> -biossystemtimeoffset <offset in [ms]>

# Interrupt network
VBoxManage controlvm <id> setlinkstate1 off

Note: the difference of controlvm vs modifyvm is that the first one is for running machines. They both have the same parameter syntax, but controlvm doesn’t support all of them.