powtrix

powtrix@trix64:/data/pcisos/vbox/hdd$ for i in *.vdi; do VBoxManage showhdinfo $i | grep "In use by VMs"; done
In use by VMs:        vbox06 [7-x86_64-enterprise] (UUID: d922cc3e-c97a-41fc-88a0-7f2d6d992104)
In use by VMs:        vbox04 [7-x86_64-ult] (UUID: 958e0c4e-c630-4558-a36b-74eb3ca9d719)
In use by VMs:        vbox05 [7-x86-ent] (UUID: a89837bc-e5d7-4804-9639-607857e20578)
In use by VMs:        vbox03 [7-x86-ult] (UUID: 87f32b50-5df6-4c2a-8377-26322926531e)
In use by VMs:        vbox14 [s2k8r2-x86_64-dc] (UUID: 49834b28-1d92-414e-809d-e832dbd5fbfa)
In use by VMs:        vbox16 [s2k8r2-x86_64-std] (UUID: 4ef1c096-91f4-4672-b9d1-ac3e4636d156)
In use by VMs:        vbox09 [s2k8r2-x86_64-ent] (UUID: d0016a72-0089-4570-a66a-6c919ca75203)
In use by VMs:        vbox15 [s2k8r2-x86_64-wb] (UUID: a288e8f1-d8fd-462a-9170-474991f60069)
In use by VMs:        vbox11 [slack64-cur] (UUID: aa77d904-0828-4f8e-bf14-898c44502998)
In use by VMs:        vbox10 [slack-cur] (UUID: 9d956367-98be-40b4-87e8-210071674e93)
In use by VMs:        vbox17 [7-x86_64-ult-ptb] (UUID: 963dfef5-dd6a-451b-94f1-dfef6af66a9e)
In use by VMs:        vbox18 [7-x86_64-ult-pow] (UUID: 82b96ae3-b83c-42cb-b16b-10830fad0ba7)
In use by VMs:        vbox19 [MS-DOS 7.10] (UUID: 70049dc8-8083-456c-b023-ce494df51262)
In use by VMs:        vbox08 [vista-x86_64-ult] (UUID: d8069b04-70f5-4ed2-86fa-2b4986e7227b)
In use by VMs:        vbox07 [vista-x86-ult] (UUID: a561ffa5-042d-40b1-973c-d84a67d4d675)
In use by VMs:        vbox13 [win98se] (UUID: d9ca2cf7-878d-49af-9680-1c24940c5ec9)
In use by VMs:        vbox01 [xp-x86-pro] (UUID: b5076c87-4405-4f83-afc3-371f4f0d0421)
In use by VMs:        vbox02 [xp-x86_64-pro] (UUID: ed6c4491-142f-432a-9618-4e0d39516103)