Change Your MAC Address - Bash

Change Your MAC Address - Bash

#!/bin/bash 
# This script allows you to change your MAC address. Proper 
# syntax is as follows: 

# change-mac home       # Changes MAC Address to Original 
# change-mac mac      # Changes MAC Address to One Specified 
# change-mac random     # Changes MAC Address Randomly 

# .macs.dat required format: 
#   XX:XX:XX:XX:XX:XX 

file=~/bin/.macs.dat 
if [ -z $file ] ; then 
        echo "File $file Does Not Exist" 
        exit 0 
fi 
NB_LINES=$(expr $(wc -l $file | sed -e 's/ *//' | cut -f1 -d " ")) 
NB_RAND=0 
while [ "$NB_RAND" -eq 0 ] 
        do 
        NB_RAND=$(expr $RANDOM \% $NB_LINES) 
done 
random=`sed -n "${NB_RAND}p;${NB_RAND}q" $file` 
  
if [ "$1" == home ]; then 
        ifconfig eth0 down 
        ifconfig eth0 hw ether XX:XX:XX:XX:XX:XX # Change to your original MAC address 
        ifconfig eth0 up 
        echo "Original MAC Address Restored." 
        exit 0 
elif [ "$1" == random ]; then 
        ifconfig eth0 down 
        ifconfig eth0 hw ether $random 
        ifconfig eth0 up 
        echo "MAC Address Randomly Changed To $random" 
        exit 1 
elif [ "$1" ]; then 
        ifconfig eth0 down 
        ifconfig eth0 hw ether $1 
        ifconfig eth0 up 
        echo "MAC Address Changed To $1." 
        exit 2 
else 
        echo "change-mac home      # Changes MAC Address to Original" 
        echo "change-mac mac     # Changes MAC Address to One Specified" 
        echo "change-mac random    # Changes MAC Address Randomly" 
        exit 3 
fi