secure erase

#!/usr/bin/env bash
#
# This is dangerous!!
#
# Seriously!
#
# Use hdparam to securely erase a hard drive... yes. all gone.
#
# Author: Mark Ruff
# Date: ??
#
# Revision: 29 Dec 2015
#           Uses command line arg to get device to erase
#
# Seriously - be careful. Like chmod a-x just to be safe


# check command line arg - should only be one. the block device to erase
if [ $# -ne 1 ]
then
  echo "please supply a device to secure erase: /dev/xxx"
  exit 1
elif ! [ -b $1 ]
then
  echo "$1 is not a block device"
  exit 2
fi

# check we really want to do this!
echo "Are you sure you want to completely erase $1? (yes|no): "
read RESPONSE

if [ $RESPONSE != "yes" ]
then
  echo "Phew..."
  exit 10
fi

echo "Are you REALLY sure you want to do this?! (YES|no): "
read RESPONSE

if [ $RESPONSE != "YES" ]
then
  echo "That was close..."
  exit 11
fi

# secure erase o.O
sudo hdparm --user-master u --security-set-pass p $1
sudo hdparm --user-master u --security-erase-enhanced p $1 &