Linux/sh: How to list files one by one, compress each (by p7zip without save file on disk) and upload to ftp server (by curl/ncftp)? - linux

Question

Linux/sh: How to list all files one by one in specific folder,
compress each (by p7zip without save file on disk) and
upload to ftp server (by curl/ncftp) with same folder structure?
This script below work perfect but
I don't want to save 7z file on a disk each time. Because I always need to delete them all after uploaded.
I prefer stio from 7zip to curl, how to do that?
#!/bin/sh
FOLDER="/volume3/backup_3/kopia_nas/tmp"
BACKUP_DIR="/volume3/backup_3/kopia_nas/tmp2"
FTP_HOST=""
FTP_USER=""
FTP_PASS=""
FTP_PORT="21"
PASSWORD="abc123"
FTP_FOLDER="/backup2"
#####################################################################
echo "[$(date +'%d-%m-%Y %H:%M:%S')] starting..."
echo ""
/usr/bin/find "${FOLDER}" -type f | while read line; do
# echo "$line" #path+file
# echo "${line##*/}" #file
# echo "${line%/*}" #path
#
/usr/bin/p7zip/7za a "${BACKUP_DIR}${line}.7z" "${line}" -t7z -ms=off -m0=Copy -mhe -mmt -mx0 -p"${PASSWORD}"
curl -s --disable-epsv -v -T "${BACKUP_DIR}${line}.7z" -u "${FTP_USER}:${FTP_PASS}" "ftp://${FTP_HOST}/${FTP_FOLDER}${line%/*}/" --ftp-create-dirs;
#-S -show errors
#-s -silent mode
#-an - no file name
#v- verbose
#/usr/bin/ncftp/ncftpput -m -u -c "${FTP_USER}" -p "${FTP_PASS}" -P "${FTP_PORT}" "${FTP_HOST}" "${FTP_FOLDER}${line%/*}/" "${line##*/}.7z"
# if [ $? -ne 0 ]; then echo "[$(date +'%d-%m-%Y %H:%M:%S')] Upload failed"; fi
done
#rm -rf "${BACKUP_DIR}/" #delete temporary folder
echo ""
echo "[$(date +'%d-%m-%Y %H:%M:%S')] completed..."
exit 0
I try this but it doesn't work for me...
/usr/bin/p7zip/7za a -an -t7z -ms=off -m0=Copy -mhe -mmt -mx0 -so -p"${PASSWORD}" | curl -S --disable-epsv -v -T - -u "${FTP_USER}:${FTP_PASS}" "ftp://${FTP_HOST}/${FTP_FOLDER}${line}/" --ftp-create-dirs;