curl -Tu username:password /path/to/dir/*(om[1]) sftp://sftp.example.com/remote/dir

RSYNC_PASSWORD='password' rsync -rtv /path/to/dir/ username@sftp.example.com:remote/dir

ssh-keygen

ssh-copy-key-id username@sftp.example.com

curl -T /path/to/dir/*(om[1]) -u username:password sftp://sftp.example.com/remote/dir