Bash script using lftp to mirror remote directory to local directory, thus keeping the local directory synchronized with the remote one.

mirror_remote_directory_to_local_directory

#!/bin/sh
#  @author:       Alexandre Plennevaux
#  @description:  MIRROR DISTANT FOLDER TO LOCAL FOLDER VIA FTP
#
# FTP LOGIN
HOST='sftp://ftp.domain.com'
USER='ftpusername'
PASSWORD='ftppassword'

# DISTANT DIRECTORY
REMOTE_DIR='/absolute/path/to/remote/directory'

#LOCAL DIRECTORY
LOCAL_DIR='/absolute/path/to/local/directory'

# RUNTIME!
echo
echo "Starting download $REMOTE_DIR from $HOST to $LOCAL_DIR"
date

lftp -u "$USER","$PASSWORD" $HOST <<EOF
# the next 3 lines put you in ftpes mode. Uncomment if you are having trouble connecting.
# set ftp:ssl-force true
# set ftp:ssl-protect-data true
# set ssl:verify-certificate no
# transfer starts now...
set sftp:auto-confirm yes
mirror --use-pget-n=10 $REMOTE_DIR $LOCAL_DIR;
exit
EOF
echo
echo "Transfer finished"
date

Error: mirror: Fatal error: Host key verification failed.
This worked for me. set sftp:auto-confirm yes