Enable or Disable wifi in relation to eth connections

disable-wifi.sh

#!/bin/bash

# get curret datetime
now=$(date)

echo "Start to check connection: $now"

/sbin/ifconfig eth0 | grep -q 'netmask'
# 0 is active, 1 is inactive
eth0Status=$?

/sbin/ifconfig wlan0 | grep -q 'netmask'
# 0 is active, 1 is inactive
wifiStatus=$?

if [ $eth0Status = 1 ] && [ $wifiStatus = 1 ]; then
    echo "Enable Wifi"
    /sbin/iwconfig wlan0 txpower auto
fi

if [ $eth0Status = 0 ] && [ $wifiStatus = 0 ]; then
    echo "Disable Wifi"
    /sbin/iwconfig wlan0 txpower off
fi

echo "Done the Check"