mac-changer

#!/bin/bash
# little bash script that changes your mac
# first parameter is the interface on which you want to change the mac
# ------> e for eth0
# ------> w for wlan0
# second parameter is your new mac
# ------> if no mac is specified, one will be randomly assigned
# if you see this error:
# (SIOCSIFHWADDR: Cannot assign requested address)
# just run the script again
#
# example : ./mac-changer e 11:22:33:44:55:66 (wont work, i know, just use an appropiate mac address)
#
# enjoy!

newmac=$2

if [ $2 =  ]
then
newmac=$(openssl rand -hex 6 | sed 's/\(..\)/\1:/g; s/.$//')
fi

echo
echo '################################'
echo '### MACs for eth0 and wlan0: ###'
  ifconfig eth0 | grep HWaddr | awk '{print $5}'
  ifconfig wlan0 | grep HWaddr | awk '{print $5}'
echo '###        New MAC is:       ###'
echo '>>>>>' $newmac '<<<<<'
echo '################################'
echo

function changemacwlan0 {
 sudo ifconfig wlan0 down
 sudo ifconfig wlan0 hw ether $newmac
 sudo ifconfig wlan0 up
}

function changemaceth0 {
 sudo ifconfig eth0 down
 sudo ifconfig eth0 hw ether $newmac
 sudo ifconfig eth0 up
}

if [ $1 = w ]
then
changemacwlan0
fi

if [ $1 = e ]
then
changemaceth0
fi

exit 0