VirtualBox fullscreen

VBoxSDL -fullscreen -vm <name of virtual machine here>
VBoxSDL -fullscreen -vm XP_mini

VirtualBox - Start up Virtual Machine without gui

So you can ssh into it or whatever

VBoxManage startvm "windows xp" --type headless
VBoxManage controlvm "windows xp" poweroff

virtualbox - convert img file to vdi

VBoxManage convertfromraw -format VDI [filename].img [filename].vdi

source(s): http://mdm-adph.blogspot.com/2009/05/using-img-files-with-virtualbox-to-test.html

VirtualBox copy harddrive to new uuid

This should work fine with vdi and vmdk files.

VBoxManage clonevdi myhardrive.vdi

source(s): http://www.brianjester.us/blog/index.php?entry=entry080720-165143