/usr/bin/nbd-server

/usr/bin/nbd-server: unrecognized option '--help'
This is nbd-server version 3.27.1
Usage: [ip:|ip6@]port file_to_export [size][kKmM] [-l authorize_file] [-r] [-m] [-c] [-C configuration file] [-p PID file name] [-o section name] [-M max connections] [-V] [-n] [-d]
	-r|--read-only		read only
	-m|--multi-file		multiple file
	-c|--copy-on-write	copy on write
	-C|--config-file	specify an alternate configuration file
	-l|--authorize-file	file with list of hosts that are allowed to
				connect.
	-p|--pid-file		specify a filename to write our PID to
	-o|--output-config	output a config file section for what you
				specified on the command line, with the
				specified section name
	-M|--max-connection	specify the maximum number of opened connections
	-V|--version		output the version and exit
	-n|--nodaemon		do not daemonize main process
	-d|--dont-fork		do not fork (implies --nodaemon)

	if port is set to 0, stdin is used (for running from inetd).
	if file_to_export contains '%s', it is substituted with the IP
		address of the machine trying to connect
	if ip is set, it contains the local IP address on which we're listening.
	if not, the server will listen on all local IP addresses
Using configuration file /etc/nbd-server/config
For help, or when encountering bugs, please contact nbd@other.debian.org