LED color wifi security alarm

[termit]

Hi all,
I am not good in scripting, but my first try was to be informed if unknown MAC address connect to my wifi.
There is for sure easier way how to write the same script, so if someone can make it simplier, I would appreciate. My biggest trouble was that I was not able to install wdiff, so I need to sort MAC addresses in file as diff shows difference even in case rows are in different order.

---

#!/bin/sh

rainbow pwr green enable #set PWR LED green

if ping -c 1 -w 3 8.8.8.8 #test of Inet
then
rainbow wan green auto #Inet works fine
else
rainbow wan red auto #Inet down
fi

#/tmp/my_devicelist contains all MAC addresses used in my home
#/tmp/my_devicelist1 is output of wlan0 and wlan1 connected devices
#/tmp/my_devicelist1_sorted is sorted file /tmp/my_devicelist1 as I was not able to use wdiff
iw dev wlan0 station dump | grep Station > /tmp/my_devicelist1
iw dev wlan1 station dump | grep Station >> /tmp/my_devicelist1
sort /tmp/my_devicelist1 > /tmp/my_devicelist1_sorted

testing interface WiFi, parameter gt shows number of unknown devices - if greater than 0 then blink red
if [ diff /tmp/my_devicelist /tmp/my_devicelist1_sorted | grep -c '>' -gt 0 ];
then
rainbow pci2 red auto
rainbow pci3 red auto
else
rainbow pci2 green auto
rainbow pci3 green auto
fi

---

file /tmp/my_devicelist has to look like this as all my clients can both SSIDs (for 2.4 and 5G too). So each MAC needs to be there twice.
Station xx:xx:xx:xx:xx:xx (on wlan0)
Station xx:xx:xx:xx:xx:xx (on wlan1)
Station xx:xx:xx:xx:xx:yy (on wlan0)
Station xx:xx:xx:xx:xx:yy (on wlan1)