Script for creating a filesystem swap file on Linux

create-swap.sh

#!/bin/bash
SWAP_SIZE_MEGABYTES=$1
if [ $SWAP_SIZE_MEGABYTES -eq 0 ];then
	echo No swap size given, skipping.
else
	if [ -e /swapfile ];then
		echo /swapfile already exists, skiping.
	else
		echo Creating /swapfile of $SWAP_SIZE_MEGABYTES Megabytes
		dd if=/dev/zero of=/swapfile bs=1024 count=$(($SWAP_SIZE_MEGABYTES*1024))
		mkswap /swapfile
		swapon /swapfile
		echo Swap Status:
		swapon -s
	fi
fi