#!/bin/bash
case "$1" in
	free)
		free -m | awk '/Mem/{print $4}'
		;;
	total)
		free -m | awk '/Mem/{print $2}'
		;;
	used)
		free -m | awk '/Mem/{print $3}'
		;;
	swap)
		free -m | awk '/Swap/{print $3}'
		;;
	*)
		echo "Usage: $0 {free|total|used|swap}"
		exit 1
		;;
esac