vbox-ng 
Description
A comfortable way of doing common VirtualBox tasks.
Installation
gem install vbox-ng
Commandline usage
# vbox -h
USAGE:
vbox [options] - list VMs
vbox [options] <vm_name> - show VM params
vbox [options] <vm_name> <param>=<value> - change VM params (name, cpus, usb, etc)
vbox [options] <vm_name> <command> - make some action (start, reset, etc) on VM
COMMANDS:
start, pause, resume, reset, poweroff, savestate,
acpipowerbutton, acpisleepbutton, clone, delete, show, snapshots
OPTIONS:
-g, --[no-]glob assume <vm_name> is a wildcard & run on multiple VMs.
All glob(7) patterns are supported plus additional
pattern "{1-20}" - expands to a sequence: 1,2,3,...,19,20
-n, --dry-run do not change anything, just print commands to be invoked
-v, --verbose increase verbosity
-N, --clones N clone: make N clones
-S, --snapshot MODE clone: use LAST shapshot or make NEW
--name NAME clone: name for the clone VM
-H, --headless start: start VM in headless mode
-h, --help show this message
EXAMPLES:
vbox -v - list VMs with memory and dir sizes
vbox "d{1-10}" list - list only VMs named 'd1','d2','d3',...,'d10'
vbox "test*" start - start VMs which name starts with 'test'
vbox "v[ace]" cpus=2 acpi=on - set number of cpus & ACPI on VMs named 'va','vc','ve'
vbox d0 - list all parameters of VM named 'd0'
vbox d0 clone -c 10 -S last - make 10 new linked clones of vm 'd0' using the
latest hdd snapshot, if any
vbox d0 clone -c 10 -S new - make ONE new shapshot of VM 'd0' and then make
10 new clones linked to this snapshot
vbox "tmp?" delete - try to destroy all VMs which name is 4 letters long
and starts with 'tmp'
vbox ae340207-f472-4d63-80e7-855fca6808cb
- list all parameters of VM with this GUID
vbox --no-glob "*wtf?!*" rm - destroy VM which name is '*wtf?!*'
Ruby examples
Clone first VM
# irb
>> require 'vbox'
=> true
>> vm = VBOX::VM.first
=> #<VBOX::VM:0x000000012c5320 @all_vars={}, @uuid="{ae340207-f472-4d63-80e7-855fca6808cb}", @name="d0">
>> vm2 = vm.clone! :snapshot => :last
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
Machine has been successfully cloned as "d1"
[.] old macaddress1=dec0de000000
[.] new macaddress1=dec0de000001
=> #<VBOX::VM:0x00000001315820 @all_vars={}, @uuid="{59d9af2a-4401-4b38-ad74-b5c6c6b45a81}", @name="d1">Find VM by name and start it
>> vm2 = VBOX::VM.find 'd14'
>> vm2.start!
[.] $DISPLAY is not set, assuming --headless
Waiting for VM "59d9af2a-4401-4b38-ad74-b5c6c6b45a81" to power on...
VM "59d9af2a-4401-4b38-ad74-b5c6c6b45a81" has been successfully started.
=> trueStop VM and destroy it (delete all its files)
>> vm2 = VBOX::VM.find 'd14'
>> vm2.poweroff!
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
=> true
>> vm2.destroy!
0%...10%...20%...30%...40%...50%...60%...70%...80%...90%...100%
=> true
>> vm2 = VBOX::VM.find 'd14'
=> nilCalculate total disk space occupied by all VMs
>> VBOX::VM.all.map(&:dir_size).inject(&:+)
=> 20271Show all VMs sorted by directory size in reverse order
>> VBOX::VM.all.sort_by(&:dir_size).reverse.each{ |vm| printf "%5d %s\n", vm.dir_size, vm.name }
9175 xp
5336 rwthCTF2012 vulnbox final
2962 ubuntu 12.04.1
2184 d0
109 u2
87 u1