Bash Script to Check MD5 Checksum of DVD Content

#!/bin/bash
clear
FILE='.checksum.md5'
SPACE_CODE='\040'
Dash_Line(){
    printf '_%.0s' {1..80}
}
DVD_Device_Name=$(cat /proc/sys/dev/cdrom/info | grep "drive name:" | awk '{print $3}')
if [ -z "${DVD_Device_Name}" ];
then
    echo "Device not found!"
    exit 1
fi
DVD_Device=/dev/$DVD_Device_Name
echo "DEVICE    -> $DVD_Device"
Mount_Point=$(cat /proc/mounts | grep $DVD_Device | awk '{print $2}')
if [ -z "${Mount_Point}" ];
then
    echo "Disk not found!"
    exit 1
fi
while [[ $Mount_Point =~ $SPACE_CODE ]];
do
    Mount_Point="${Mount_Point/"$SPACE_CODE"/' '}"
done
echo "MOUNT     -> $Mount_Point"
Dash_Line; echo; cd "$Mount_Point"; ls -g; Dash_Line; echo; echo
if [ -f $FILE ]; then
    md5sum -c .checksum.md5
else
   echo "File '$FILE' does not exist."
fi