#! /bin/sh
device_size=`sudo ./ntfsresize -s 25G -n -v -f /dev/disk0s4 | grep Current\ device\ size | awk -F \( '{print $2}'| awk -F \  '{print $1}'`
new_size_temp=`expr device_size - 10`
new_size=$new_size_temp"M"
sudo ./ntfsresize -s $new_size -v -f /dev/disk0s4 

