#!/bin/sh
openbsd() {
    TOTAL="$(sysctl -n hw.physmem | awk '{ printf "%.1fG\n", $1 / 1024 / 1024 / 1024 }')"
    MUSED="$(top -b -n 1 | grep -o 'Real.*' | sed 's/Real: //' | sed 's/\/.*//')"
    printf "$MUSED" | grep -E "[0-9]{4}" > /dev/null && FUSED="$(printf "$MUSED" | cut -c -2 | sed 's/./.&/2')G" || FUSED=$MUSED
    printf "$FUSED/$TOTAL\n"
}

linux() {
	TOTAL="$(free -h | awk '/^Mem:/ {print $2}')"
	MUSED="$(free -h | awk '/^Mem:/ {print $3}')"
	printf "$MUSED" | grep -E "[0-9]{4}" > /dev/null && FUSED="$(printf "$MUSED" | cut -c -2 | sed 's/./.&/2')G" || FUSED=$MUSED
	printf "$FUSED/$TOTAL\n" | sed 's/Gi/G/g' | sed 's/Mi/M/g'
}

case $(uname) in
	OpenBSD) openbsd ;;
	Linux) linux ;;
esac