Erase a disk using dd - An alternative to DBAN

dbanlz.sh

#!/bin/bash

if [ "$EUID" -ne 0 ]
  then echo "Please run as root"
  exit
fi

warn='!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!'
echo -e "$warn\n$warn\n$warn"
echo "                     WARNING"
echo " Destructive disk wiping is about to take place "
echo ""
echo ""
echo " enter the disk device you want to erase."
echo "   example: /dev/sdd"
echo ""
echo " Press Ctrl+C to cancel"
echo ""
printf " Erase device : "


read device
[[ $device =~ ^/dev/.+$ ]] && match=1 || match=0

if [[ "$match" -eq 0 ]]; then
    echo "Invalid device entered. Exiting."
    exit 1
fi

echo "Erasing disk $device. Press enter to continue or Ctrl+C to cancel."
read fart





disksize=$(blockdev --getsize64 $device)

# greets http://stackoverflow.com/a/806923/4071859
re='^[0-9]+$'
if ! [[ $disksize =~ $re ]] ; then
    echo "error: blockdev could not get size of disk. try running dd manually." >&2;
    exit 1
fi

# DESTROY! DESTROY! DESTROY!
openssl enc -aes-256-ctr -pass pass:"$(dd if=/dev/urandom bs=128 count=1 2>/dev/null | base64)" -nosalt </dev/zero | pv -bartpes $disksize | dd bs=64K of=$device


exit 0