thanks
From the documentation:
“The ftpd daemon is started when inetd receives a service request at the port specified by the FTP entry in the /etc/services file (inetd listens for service requests specified in the /etc/inetd.conf file at a port defined in the services file).”
“Note: Since stdin and stdout must be TCP sockets, you should launch the ftpd daemon from the inetd daemon or from a similar application. It can’t be started on the command line.”