Clear swap partition

#!/bin/bash
# Filename: Clear-swap
# Author: robz
# Version: 280611
# One for the "nautilus-scripts" directory use to clear the swap partition.
# In this script I'm assuming you use a separate partition for your swap and
# that that swap uses a UUID to identify it, have a look in your /etc/fstab.
# It works by dismounting the swap file, writing zeros to the partition it
# occupied then remounting again with the original parameters.
# Enhanced dd "dcfldd" will be needed for this, "sudo apt-get install dcfldd"
# Using "dcfldd if=/dev/zero" will clear swap fairly rapidly, an option for the
# paranoid being "dcfldd if=/dev/urandom" :)

C2="\033[1m\E[32m" C6="\033[1m\E[36m" C7="\033[1m\E[37m"    # green cyan white.
TOTL=$(awk '/SwapTotal/{print $2/1024}' /proc/meminfo)      # Swap size MBs.

# Run a terminal and execute all in a root shell.
gnome-terminal --title "Clear Swap Partition" --geometry=62x11+0+24 -x\
    sudo bash -c "\
    ${LCTN=$(awk 'NR==2 {print $1}' /proc/swaps)};\
    ${UUID=$(awk -F'[= ]' '/^UUID.*swap/{print $2}' /etc/fstab)};\
    tput clear; tput civis;\
    if [[ -z $LCTN || -z $UUID ]]; then\
        echo -e '$C6''\n[Error] Can'\''t read location and/or UUID, exiting.';\
        read -t10; exit 1;\
    fi;\
    echo -ne '$C6''Write ''$C7''$TOTL''MiBs''$C6'' of zeros to ';\
    echo -e 'swap space on partition ''$C7''$LCTN''$C6\n';\
    swapoff -a;\
    trap 'killall dcfldd 2> /dev/null; mkswap -U $UUID $LCTN;\
    swapon -a; sleep 5; exit' INT TERM EXIT;\
    dcfldd if=/dev/zero of=$LCTN statusinterval=2 bs=10M conv=notrunc;\
    echo -ne '$C2''\nAll Done.....''$C6''\nRe-mounting swap on partition: ';\
    echo -e '$C7''$LCTN''$C6''\nusing UUID: ''$C7''$UUID\n''$C6';\
    read -t5"

# TODO this needs zero the free space code adding to it for an all singing all
# dancing version.