Mounting script for nfs mounting various shares on my NAS

nasMnt

#! /bin/bash
address=$(sudo arp-scan -I enp5s0 -localnet | grep "Synology" | awk '{print $1'})
choice=$(echo -e "Filme\nMusik\nUnsortierte Musik" | dmenu -i -p "Which NAS     share to mount?")
if [ "$choice" == "Filme" ]; then
  volume=2
else 
  volume=1
fi
if [ $(df 2> /dev/null | grep --count "$choice") -ne 0 ]; then
  sudo umount "/mnt/nas/$choice"
else
  sudo mount -t nfs --source $address:/volume$volume/"$choice" --targ    et /mnt/nas/"$choice" --rw
fi