To start it in GUI mode:
vboxmanage startvm VMName -type gui
To start it in Headless mode:
vboxmanage startvm VMName -type headless
Switch Modes:
vboxmanage controlvm VMName savestate
Run the startvm command of your choice.
To start it in GUI mode:
vboxmanage startvm VMName -type gui
To start it in Headless mode:
vboxmanage startvm VMName -type headless
Switch Modes:
vboxmanage controlvm VMName savestate
Run the startvm command of your choice.