NOW=$(date +"%m%d%Y")
  FILE="XXXXX.TXT"
#I add below for changing the file name with below format
  filename=YYYYL.$(date --date="-1 day" +"%Y%m%d").001
exec > $NOW.log
exec 2>&1

if ! mkdir /tmp/$$
then
        echo "Couldn't create /tmp/$$" >&2
        exit 1
fi

echo "Storing into /tmp/$$" >&2

SrcDir="FTP"
DstDi='/tmp/'

trap "rm -Rf /tmp/$$" EXIT # Clean up temp folder when the script quits by any means

# Check if you can connect.
ftp -nvd $HOST 2>&1 <<EOF | tee $NOW
quote user $ftpuser
quote pass $ftppass
hash
prompt off
ls
EOF

if [ "$?" -ne 0 ]
then
        echo "Couldn't connect" >&2
        exit 1
fi

# Get the remote file
ftp -nvd $HOST <<EOF
quote USER $ftpuser 
quote PASS $ftppass
hash
prompt off
lcd /tmp/$$
bin
get $FILE
bye
EOF

if [ "$?" -ne 0 ] || [ ! -f /tmp/$$/$FILE ]
then
        echo "Couldn't retrieve $FILE" >&2
        exit 1
fi

FTPSIZE=$(awk '$NF==FILE { print $(NF-1) }' FILE="$FILE" "$NOW")
LOCALSIZE=$(wc -c < /tmp/$$/$FILE)

if [ "$FTPSIZE" -ne "$LOCALSIZE" ]
then
        echo "File differs from remote size" >&2
        exit 1
fi

#I add below for copy file from tmp and save the file as specific name 
cp -p /tmp/$$/$FILE /tmp/$filename

# File has successfully transferred, move it from /tmp/$$ into /tmp
mv /tmp/$$/$FILE /tmp
echo "SUCCESSFULLY RETRIEVED $FILE & RENAME AS $filename" >&2