Calculates RAM usage by some program

calcram.sh

#!/bin/bash

# Author: Konrad (morsik) Mosoń
# Usage: ./calcram.sh chromium

SUM=0
OUT=`ps aux | grep $1 | awk '{print $4}'`

for n in $OUT
do
	SUM=`echo "$SUM + $n" | bc`
done

ALLRAM=`cat /proc/meminfo | grep MemTotal: | awk '{print $2}'`
USEDRAM=`echo "(($SUM) * ($ALLRAM / 1024)) / 100" | bc`

echo "$USEDRAM" M