Skype killer

#!/bin/bash

#Created by Tomaskom

#I created this because Linux version of skype often goes crazy
#on login and eats all RAM available, pushing everything else
#to swap and rendering the system unusable until oom-killer
#does its job (which can take ages with large swap).

#script that kills KILLPROG when
#CHECKPROG's RES memory exceeds LIMITMEM

#limit (MB) - minimal acceptable value is 10
LIMITMEM="190"

#controlled program
CHECKPROG=skype
#program to be killed
KILLPROG=skype

#put space before and $ after for exact process name only
CHECK=`echo " ${CHECKPROG}$"`

echo $"Checking RAM usage by $CHECKPROG (limit ${LIMITMEM}m)"
echo -n "Actual usage: "

while true;
do
    #strip top output to CHECKPROG RES memory
    TOPMEM=`top -b -n 1 | grep "${CHECK}" | awk '{print $6}'`

    #rewrite last line with updated data
    echo -en "\r\e[0K"
    #no quotes here to get rid of newlines
    echo -n Actual\ usage:\ $TOPMEM

    #process only if m suffix is in place
    #(minimum 10m limit comes from here due to top output)
    if TOPMEM=$(echo "$TOPMEM" | grep "m$"); then
        #sum all instances of CHECKPROG
        MEGAMEM=`echo "$TOPMEM" | awk '{s+=$1}END{print s}'`
        #kill if MEGAMEM > LIMITMEM
        if [[ "$MEGAMEM" -ge "$LIMITMEM" ]]; then
            echo -e "\nkilling $CHECKPROG (for using $MEGAMEM MB)"
            if killall -s SIGKILL $KILLPROG; then
                echo "$KILLPROG killed"
                exit
            else
                echo "failed to kill $KILLPROG"
                exit
            fi
        fi
    fi
done