[HaBo]

used_ram=$(free -mto | grep Mem: | awk '{ print $3 }')
free_ram=$(free -mto | grep Mem: | awk '{ print $4 }')
total_ram=$(free -mto | grep Mem: | awk '{ print $2 }')

cat /proc/net/dev | grep eth0 | awk '{ print $1 }'

CPU_LOAD=0.0
$(ps -eo pcpu,pid -o comm= | tail -n +2 | awk '{ print $1 }'

#!/bin/bash
sum=0
for n in $(ps -eo pcpu,pid -o comm= | tail -n +2 | awk '{print $1}')
do
    sum=$(echo $sum + $n | bc)
done
echo $sum

ps -eao pcpu | tail -n +2 | awk '{a+=$1} END {print a}'

used_ram_values=""
cpu_load_values=""
rx_values=""
tx_values=""


rx_old=$(cat /proc/net/dev | grep eth0 | awk '{ print $1 }' | sed 's/eth0://g')
tx_old=$(cat /proc/net/dev | grep eth0 | awk '{ print $9 }')

while [ 1 ]
do
        sleep 1

        rx=$(cat /proc/net/dev | grep eth0 | awk '{ print $1 }' | sed 's/eth0://g')
        tx=$(cat /proc/net/dev | grep eth0 | awk '{ print $9 }')
        rx_traffic=$[ rx - rx_old ]
        tx_traffic=$[ tx - tx_old ]
        rx_old=$rx;
        tx_old=$tx;

        rx_values="$rx_values $rx_traffic"
        tx_values="$tx_values $tx_traffic"
        used_ram_values="$used_ram_values $(free -mto | grep Mem: | awk '{ print $3 }')"
        cpu_load_values="$cpu_load_values $(ps -eao pcpu | tail -n +2 | awk '{a+=$1} END {print a}')"

        rx_avrg=$(calculate_average $rx_values)
        tx_avrg=$(calculate_average $tx_values)
        ram_avrg=$(calculate_average $used_ram_values)
        cpu_avrg=$(calculate_average $cpu_load_values)

        echo "RX Average:  $rx_avrg"
        echo "TX Average:  $tx_avrg"
        echo "RAM Average: $ram_avrg"
        echo "CPU Average: $cpu_avrg"

done;

function calculate_average {
        sum=0
        count=0
        for n in $1
        do
                sum=$( echo "$sum + $n" | bc )
                count=$[ count + 1 ]
        done;
        echo $[ sum / count ]
}