random_mac.sh

#!/bin/bash
  export PURPLE="\e[01;35m"
  export Z="\e[0m"
  export BLUE="\e[01;34m"

  echo -e $PURPLE "Genierere zufällige MAC-Adresse"

  a1=`cat /dev/urandom | tr -dc 'a-fA-F0-9' | fold -w 2 | head -n 1`
  a2=`cat /dev/urandom | tr -dc 'a-fA-F0-9' | fold -w 2 | head -n 1`
 a3=`cat /dev/urandom | tr -dc 'a-fA-F0-9' | fold -w 2 | head -n 1`
 a4=`cat /dev/urandom | tr -dc 'a-fA-F0-9' | fold -w 2 | head -n 1`
 a5=`cat /dev/urandom | tr -dc 'a-fA-F0-9' | fold -w 2 | head -n 1`
 a6=`cat /dev/urandom | tr -dc 'a-fA-F0-9' | fold -w 2 | head -n 1`

 ifconfig eth0 down
 ifconfig eth0 hw ether $a1":"$a2":"$a3":"$a4":"$a5":"$a6
 ifconfig eth0 up
 echo -e $BLUE "neue MAC-Adresse lautet:" $a1":"$a2":"$a3":"$a4":"$a5":"$a6
 echo -e $Z
 exit