wiper.sh

#!/bin/bash

while true
        do

while [[ $break != "1" ]]
        do

cdev=$(diskutil list | grep "disk[1,2]")

if [[ $cdev == "" ]]
        then

                i=1
                sp="/-\|"
                echo -n ' '
                        while [[ $cdev == "" ]]
                        do
                                cdev=$(diskutil list | grep "disk[1,2]")
                                printf "\b${sp:i++%${#sp}:1}"
                        done
        else
                echo -e "\n"
                echo "Device ready..."
                diskutil unmountDisk force disk1
                diskutil unmountDisk force disk2
                diskutil eraseDisk JHFS+ 1 disk1
                diskutil unmountDisk force disk1
                diskutil unmountDisk force disk2
                diskutil mountDisk disk1
                echo "Disk has been erased..."
                say "done"
                say "done"
                tput bel
                break=1
fi
done

while true
        do

cdev2=$(diskutil list | grep "disk[1,2]")

if [[ $cdev2 == "" ]]
        then
                echo -e "\n"
                echo "Device disconnected"
                ./$0
    else
                 i=1
                sp="/-\|"
                echo -n ' '
                        while [[ $cdev != "" ]]
                        do
                                cdev=$(diskutil list | grep "disk[1,2]")
                                printf "\b${sp:i++%${#sp}:1}"
                        done
fi
done
done