#!/bin/bash
set -ue

if [ $# -eq 1 ]; then
	dev=$1
elif [ $# -eq 0 ]; then
	select dev in $(ls /sys/class/block/); do break; done
else
	echo "Usage: $0 [device]"
	echo "e.g.: $0 /dev/sda"
	exit 1
fi

size="$(($(cat "/sys/class/block/$dev/size")*512))"
dev="/dev/$dev"
echo "Select $dev with size $(numfmt --to=iec-i $size) or $size bytes"

read -p "Are you sure? It will wipe $dev [y/n]" r
if [ "$r" != y ]; then
	echo "Answer y to proceed"
	exit 1
fi

pv -aeprts "$size" /dev/zero | sudo dd of="$dev" bs=4096
sync