last line

src/freedombone

   echo 'fi' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo '' >> /usr/bin/$BACKUP_SCRIPT_NAME
 
-  echo -n 'used_percent=$(df -k $USB_MOUNT | ' >> /usr/bin/$BACKUP_SCRIPT_NAME
+  echo -n 'used_percent=$(df -k $USB_MOUNT | tail -n 1 | ' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo -n "awk -F ' ' '{print " >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo -n '$5' >> /usr/bin/$BACKUP_SCRIPT_NAME
   echo -n "}' | " >> /usr/bin/$BACKUP_SCRIPT_NAME