unmounted disks on compute engine GCE using gcutil

unmounted.py

#!/usr/bin/env python
import os
os.system("gcutil listinstances --filter='status eq RUNNING'  --columns=disks --format=csv 2>&1 | grep '/' >/tmp/gcutil.mounted;"
"gcutil listdisks --columns=name --format=names >/tmp/gcutil.disks")

disks = set(open("/tmp/gcutil.disks").read().split())
mounted = set(open("/tmp/gcutil.mounted").read().split())

uniques = disks.difference(mounted).union(mounted.difference(disks))

print "UnMounted disk:"
for disk in uniques:
  print disk