FTP directory clone script for Unix OS (Required: bash & wget command)

ftp-clone.sh

#!/bin/bash
# FTP directory clone script for Unix OS
# Required: bash & wget command
# https://gist.github.com/mugifly/931624e375d40267afc4

# Copy source (Remote FTP server)
SRC_HOST="example.com"
SRC_USERNAME="xxxx"
SRC_PASSWORD="yyyy"
SRC_DIRECTORY="/home/xxxx/src"

# Copy destination directory (Local computer)
DST_DIRECTORY="/home/zzzz/dst"

# Maximum depth level of recursion directory search
MAX_RECURSIVE_DEPTH=50

# ----

# Confirm the settings
echo "-- FTP Directory Clone --"
echo "Copy source: "
echo "* Host: ${SRC_HOST}"
echo "* Username: ${SRC_USERNAME}"
echo "* Directory: ${SRC_DIRECTORY}"

echo ""
echo "Copy destionation: "
echo "* Host: localhost"
echo "* Directory: ${DST_DIRECTORY}"

if [ ! -d $DST_DIRECTORY ]; then
        echo -e "\nThe copy destination directory was not found."
        echo "Now created the directory: ${DST_DIRECTORY}"
        mkdir $DST_DIRECTORY
fi
if [ -d "${DST_DIRECTORY}/${SRC_HOST}/" ]; then
        echo -e "\nAn useless directory in the copy destination directory was found"
        echo "Please check the files and delete that directory:"
        echo "${DST_DIRECTORY}/${SRC_HOST}/"
        exit 0
fi

# Confirm a execution
echo -e "\nWould you start download via FTP from ${SRC_HOST}?"
echo -e "[CAUTION] The copy destination directory will be OVERWRITTEN!:\n ${DST_DIRECTORY}"
echo -e "\nOkay? (yes/no)"
read ANS
if [ $ANS != "yes" ]; then
  echo "Canceled"
  exit 0
fi

# FTP download
echo -e "\nFTP downloading..."
wget -mckr -np -l ${MAX_RECURSIVE_DEPTH} --restrict-file-names=nocontrol --directory-prefix=${DST_DIRECTORY} --passive-ftp "ftp://${SRC_USERNAME}:${SRC_PASSWORD}@${SRC_HOST}/${SRC_DIRECTORY}"
# It's ok even if It shows a double slash (e.g. /foo//bar/) in the path.

# Check whether a download is valid (Because can't get a exit code as normally)
if [ ! -d "${DST_DIRECTORY}/${SRC_HOST}/" ]; then
        echo "[Error] Could not download!"
        exit 255
fi

# Delete useless files (Those generated by wget command)
find ${DST_DIRECTORY} -name '.listing' -exec rm -f {} \; > /dev/null 2>&1

# Fix a directory hierarchy
for file in "${DST_DIRECTORY}/${SRC_HOST}/${SRC_DIRECTORY}/*"
do
        cp -af -R ${file} ${DST_DIRECTORY}
done
rm -rf "${DST_DIRECTORY}/${SRC_HOST}/"

# Complete
echo "Done. ${DST_DIRECTORY}"
exit 0