Count surrounding devices based on captured probe requests on Linux

count.sh

#!/bin/bash

Red='\e[0;31m'

allowAbort=true;
exitHandler(){
    if $allowAbort; then
        echo "LULLOOOOOOOOOOOOOOOOOOOOOOOOO"
        rm tmp count;
        exit 1;
    fi
}

ifconfig wlan0 down;
sleep 1;
iwconfig wlan0 mode monitor;
sleep 1;
ifconfig wlan0 up;

allowAbort=false;
echo " $RED Listening for probe requests, hit CTRL+C to terminate listening and count devices";
#tcpdump -i wlan0 -e -s 256 subtype probe-req > tmp;
#tcpdump -i wlan0 type mgt subtype probe-req or arp -e -v
tcpdump -i wlan0 type mgt subtype probe-req or arp -e -v > tmp
ifconfig wlan0 down;
sleep 1;
iwconfig wlan0 mode managed;
sleep 1;
ifconfig wlan0 up;

allowAbort=true;
cat tmp | awk -F "SA" '{ print $2 }' | awk '{ print $1 }' > count
python macCounter.py

macCounter.py

src = open('count','r')
strings = src.read()
macs = strings.split('\n');
nodup = []
count = 0;

for mac in macs:
    if not ( mac in nodup ):
        if len(mac)>0:
            nodup.append(mac)
            count += 1

device = 'devices'

if count==1:
    device='device'

print str(count) + " nearby " + device + " discovered."