This is how it should look

gistfile1.txt

#!/bin/bash
# Easy drive encryption script
# using LUKS

DEVICE="$1"
NAME="$2"
KEYDIR="/keys"
KEYFILE="/keys/$NAME.key"
HEADERFILE="/keys/$NAME.luks.header"
MOUNTPOINT="/mnt/$NAME"

if [ -z "$1" -o -z "$2" ]; then
	cat <<DELIM
 Usage:
./luksus DEVICENAME NICKNAME-of-luks-container

EXAMPLE:
./luksus /dev/sdb1 rambo1
DELIM
        exit 1
fi

FILE="/tmp/out.$$"
GREP="/bin/grep"

if [[ $EUID -ne 0 ]]; then
   echo "This script must be run as root" 1>&2
   exit 1
fi

echo "This script will wipe out $DEVICE. Are you sure? Ctrl+C to stop."
read || exit 1

mkdir -p "$MOUNTPOINT"
mkdir -p "$KEYDIR"


shred -v -n1 "$DEVICE"
dd if=/dev/urandom of="$KEYFILE" bs=512 count=256


cryptsetup --verbose --key-size=512 --cipher=aes-xts-plain64 luksFormat "$DEVICE" "$KEYFILE" || exit 1
cryptsetup isLuks "$DEVICE" || exit 1
cryptsetup luksOpen "$DEVICE" "$NAME" --key-file="$KEYFILE" || exit 1
cryptsetup luksHeaderBackup --header-backup-file="$HEADERFILE" "$DEVICE" --verbose || exit


mkfs.ext4 "/dev/mapper/$NAME"  || exit 1

mount -t ext4 "/dev/mapper/$NAME" "$MOUNTPOINT" >/dev/null 2>&1 || exit 1
mount -t ext4 "$DEVICE" "$MOUNTPOINT" >/dev/null 2>&1 || exit 1