Checks my macbook's Wi-Fi every 5 seconds. If it's down, it restarts the adapter. I use it when my Wi-Fi signal is flaky and my macbook is having issues staying connected.

autoWireless.sh

#!/bin/bash

# Checks my mac's Wi-Fi every 5 seconds.
# If it's down, restart the adapter.

while :
do
	if [ $(networksetup -getinfo Wi-Fi | grep -c 'IP address:') = '1' ]
	then 
		$(networksetup -setairportpower en1 off)
		$(networksetup -setairportpower en1 on)
		sleep 5
		echo "Restarting Wi-Fi at $(date)."	
	fi
	sleep 5
done