Wipe linux device with progress bar

wipe.sh

#!/bin/bash

# resource
# https://wiki.archlinux.org/index.php/Securely_wipe_disk

dev="/sys/block/sda"

sector_number=$(cat ${dev}/size)
sector_size=$(cat ${dev}/queue/logical_block_size)
size=$((${sector_number} * ${sector_size}))

# Fast wipe
echo "dd if=/dev/zero | pv --size ${size} | dd seek=0 of=${dev} bs=${block_size} count=${block_count} oflag=\"direct\""

# Wipe with random, should avoid data remanence for paranoïds
echo "dd if=/dev/urandom | pv --size ${size} | dd seek=0 of=${dev} bs=${block_size} count=${block_count} oflag=\"nocache\""