arch-maride-flavour/steps/10-wipe.step

#!/bin/sh

echo "~> Going to wipe $blockdevice. Just skip it if you are really sure that the drive is clean."
echo -n "~> Wipe block device? (Y/n) "
read answer

if [ "$answer" == "n" ] || [ "$answer" == "N" ]; then
	exit 0
fi

echo -n "~> You sure? (y/N) "
read answer

if [ "$answer" == "y" ] || [ "$answer" == "Y" ]; then
	echo "~> OK. Be patient now, that could take some time..."
	dd if=/dev/zero of=$blockdevice status=progress
	exit 0
else
	exit 1
fi