RaspberryPi HomePass - Random Cycle

#!/bin/sh

#Calculate the number of MACs in the list
MAXLINE=$(/bin/sed -n '$=' /home/pi/maclist.txt)

#Generate a random line number to read the MAC from
LINE=$(/usr/bin/shuf -i 1-${MAXLINE} -n 1)

#Get the MAC from the specified line number
MAC=$(/bin/sed -n ${LINE}p /home/pi/maclist.txt)

#Stop the AP and DHCP services
/usr/bin/sudo /usr/sbin/service hostapd stop
/usr/bin/sudo /usr/sbin/service isc-dhcp-server stop

#Take the wireless interface down and change the MAC to our new one
/usr/bin/sudo /sbin/ifconfig wlan0 down
/usr/bin/sudo /sbin/ifconfig wlan0 hw ether $MAC
/usr/bin/sudo /sbin/ifconfig wlan0 up

#Give the WiFi drivers a few seconds to start up before starting the AP, otherwise the DHCP service might not start
/bin/sleep 10
/usr/bin/sudo /usr/sbin/service hostapd start

#Wait a few seconds for the AP service to start up, otherwise the DHCP service might not bind correctly
/bin/sleep 5
/usr/bin/sudo /usr/sbin/service isc-dhcp-server start