Mac OSX Bash script for quick dot files cleaning on USB/SD and auto eject

dotclean.sh

#!/bin/bash
# DOT files clean script and auto eject
printf "Insert your USB/SD volume name (es: SD): "
read -r volumename
if df | grep -iw "$volumename" > /dev/null
then
    echo "Cleaning dot_files into \"/Volumes/$volumename\" .."
    sudo dot_clean /Volumes/$volumename
    echo "Ejecting volume .."
    sudo diskutil eject /Volumes/$volumename
    echo "Well done!"
    exit 0
else
    echo "No \"/Volumes/$volumename\" found - Exiting.."
    exit 1
fi