• Clone a virtual disk image: 

    1$ VBoxManage clonehd original-disk.vdi copy.vdi

  • Resize a virtual disk image to 20 Gb: 

    1$ VBoxManage modifyhd disk.vdi --resize 20000

  • Convert a VirtualBox image to a raw image: 

    1$ VBoxManage clonehd --format RAW disk.vdi disk.raw

  • Convert a raw image to a VirtualBox image: 

    1$ VBoxManage convertdd disk.raw disk.vdi --format VDI

  • List virtual machines: 

    1$ VBoxManage list vms

  • Fix broken NAT ( source  ): 

    1$ VBoxManage modifyvm "name" --natdnshostresolver1 on
2$ VBoxManage modifyvm "name" --natdnsproxy1 on