#!/bin/bash

signal=""
level=""
avg=""
for i in {1..5}
do
    signal=$(echo "$(iwconfig wlan0 | grep Signal)" | sed -e 's/^.*Signal level=\(.*\) dBm/\1/')
    printf "Signal: $signal"
    level=$((level+signal))
    #echo $level
    sleep 1
done

avg=$((level/5))
echo "Average:" $avg