From my blog post, Scripting Linux Swap Space: Scripting Linux Swap Space

remove_swap.sh

#!/bin/sh

# does the swap file exist?
grep -q "swapfile" /etc/fstab

# if it does then remove it
if [ $? -eq 0 ]; then
	echo 'swapfile found. Removing swapfile.'
	sed -i '/swapfile/d' /etc/fstab
	echo "3" > /proc/sys/vm/drop_caches
	swapoff -a
	rm -f /swapfile
else
	echo 'No swapfile found. No changes made.'
fi

# output results to terminal
cat /proc/swaps
cat /proc/meminfo | grep Swap