#!/bin/sh

awk '
/^SwapTotal:/ {Total=$2/(1024 * 1024)}
/^SwapFree:/ {Free=$2/(1024 * 1024)}
/^SwapCached:/ {Cached=$2/(1024 * 1024)}
END {
printf "%.2f %.2f %.2f %.2f\n", Total, Free, Cached, (Total - Free)}' /proc/meminfo