curl --ftp-ssl -k ftp://user:pass@IP

$ curl -s ftp://user:pass@IP/path/to/folder/ |
    grep -e '^-' | awk '{ print $9 }' |
        while read f; do
            curl -O ftp://user:pass@IP/path/to/folder/$f;
        done

#!/bin/bash
#
# Use cURL to download the files in a given FTPS directory (FTP over SSL)
# eg:
# curl_get_ftp_dir -u myUserName -p myPassword -d ftps://ftpserver.com/dir1/dir2
# Optionally, use:
#    -k - to ignore bad SSL certificates
#    --config userPassFile - to use the contents of a file including myUserName:myPassword in place of command line arguments
#    --silent - to silently download (otherwise cURL will display stats per file)

while [[ $# -gt 1 ]]
do
key="$1"

case $key in
    -u|--username)
    user="$2"
    shift
    ;;
    -p|--password)
    pass="$2"
    shift
    ;;
    -d|--dir|--directory)
    ftpDir="$2"
    shift
    ;;
    -k|--ignoreSSL|--ignoreBadSSLCertificate)
    ignoreBadSSLCertificate="-k"
    ;;
    -s|--silent)
    silent="-s"
    ;;
    -K|--config|--configFile)
    config="$2"
    shift
    ;;
    *)
        echo "Unknown Option!"
    ;;
esac
shift
done

if [ -z "${config+x}" ]; then
    CURL_OPTS="$silent --ftp-ssl $ignoreBadSSLCertificate -u $user:$pass"
else
    #CURL_OPTS="$silent --ftp-ssl $ignoreBadSSLCertificate --config $config"
    #Originally intended to be a curl config file - for simplicity, now just a file with username:password in it
    #Be sure to chmod this file to either 700, 400, or 500
    CURL_OPTS="$silent --ftp-ssl $ignoreBadSSLCertificate -u $(cat $config)"
fi

curl $CURL_OPTS $ftpDir |
grep -e '^-' | awk '{ print $9 }' |
    while read f; do
        curl -O $CURL_OPTS $ftpDir/$f;
    done