Get average signal quality and power level from /proc/net/wireless.

wifi_measure

#!/bin/bash
#The War Room Blog
#http://warroom.securestate.com/index.php/cya-cover-your-alfa-part-ii/
x=1                                                                                 # set the variables
HIGH_QUAL=$(cat /proc/net/wireless | awk 'END { print $3 }' | sed 's/\.$//')        # parse the output of /proc/net/wireless to get integers only
LOW_QUAL=$(cat /proc/net/wireless | awk 'END { print $3 }' | sed 's/\.$//')
AVG_QUAL=$(cat /proc/net/wireless | awk 'END { print $3 }' | sed 's/\.$//')
HIGH_LVL=$(cat /proc/net/wireless | awk 'END { print $4 }'| sed 's/\.$//')
LOW_LVL=$(cat /proc/net/wireless | awk 'END { print $4 }'| sed 's/\.$//')
AVG_LVL=$(cat /proc/net/wireless | awk 'END { print $4 }'| sed 's/\.$//')
echo "working..."

while [ $x -le 600 ]                                                                # populate the array for 600 seconds
 do
 QUAL_ARRAY[$x]=$(cat /proc/net/wireless | awk 'END { print $3 }' | sed 's/\.$//')  # populate arrays with the values from /proc/net/wireless
 LVL_ARRAY[$x]=$(cat /proc/net/wireless | awk 'END { print $4 }' | sed 's/\.$//')
 x=$(( $x + 1))
 sleep 1
 done

for i in "${QUAL_ARRAY[@]}"
  do
    if [[ "$i" -gt "$HIGH_QUAL" ]]; then                                            # set the high quality
    HIGH_QUAL="$i"
    fi
    if [[ "$i" -lt "$LOW_QUAL" ]]; then                                             # set the low quality
    LOW_QUAL="$i"
    fi
    AVG_QUAL=$(($AVG_QUAL + $i))                                                    # this isn't the actual average, just a running sum
  done
for i in "${LVL_ARRAY[@]}"
  do
    if [[ "$i" -gt "$HIGH_LVL" ]]; then
    HIGH_LVL="$i"
    fi
    if [[ "$i" -lt "$LOW_LVL" ]]; then
    LOW_LVL="$i"
    fi
    AVG_LVL=$(($AVG_LVL + $i))
  done

AVG_QUAL=$(($AVG_QUAL/600))                                                         # divide the running sum from line 29 by the number of seconds from line 13
AVG_LVL=$(($AVG_LVL/600))
echo "Highest Quality:" $HIGH_QUAL
echo "Lowest Quality:" $LOW_QUAL
echo "Average Quality (integer):" $AVG_QUAL
echo "Highest Level:" $HIGH_LVL
echo "Lowest Level:" $LOW_LVL
echo "Average Level (integer):" $AVG_LVL