Adding loopback interfaces

add-loopback.sh

#!/bin/bash

echo "Will add $1 loopback interfaces, starting at 127.0.0.2"
ifaces=$(expr $1 + 2)
for ((i=2;i<$ifaces;i++))
do
    sudo ifconfig lo0 alias 127.0.0.$i up
    echo "Added loopback interface 127.0.0.$i"
done

Usage: ./add-loopback.sh 5 will add 5 loopback interfaces, starting at 127.0.0.2