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net_adm(3)		   Erlang Module Definition		    net_adm(3)

       net_adm - Various Erlang	net administration routines.

       This module contains various network utility functions.

       dns_hostname(Host) -> {ok, Name}	| {error, Host}


		 Host =	atom() | string()
		 Name =	string()

	      Returns  the  official name of Host, or {error, Host} if no such
	      name is found. See also inet(3).

       host_file() -> Hosts | {error, Reason}


		 Hosts = [Host :: atom()]
		 Reason	=
		     file:posix() |
		     badarg |
		     terminated	|
		     system_limit |
		     {Line :: integer(), Mod ::	module(), Term :: term()}

	      Reads file .hosts.erlang,	see section Files. Returns  the	 hosts
	      in this file as a	list. Returns {error, Reason} if the file can-
	      not be read or the Erlang	terms on the  file  cannot  be	inter-

       localhost() -> Name


		 Name =	string()

	      Returns  the  name of the	local host. If Erlang was started with
	      command-line flag	-name, Name is the fully qualified name.

       names() -> {ok, [{Name, Port}]} | {error, Reason}

       names(Host) -> {ok, [{Name, Port}]} | {error, Reason}


		 Host =	atom() | string() | inet:ip_address()
		 Name =	string()
		 Port =	integer() >= 0
		 Reason	= address | file:posix()

	      Similar to epmd -names, see erts:epmd(1).	Host defaults  to  the
	      local host. Returns the names and	associated port	numbers	of the
	      Erlang nodes that	epmd registered	at the specified host. Returns
	      {error, address} if epmd is not operational.


	      (arne@dunn)1> net_adm:names().

       ping(Node) -> pong | pang


		 Node =	atom()

	      Sets  up a connection to Node. Returns pong if it	is successful,
	      otherwise	pang.

       world() -> [node()]

       world(Arg) -> [node()]


		 Arg = verbosity()
		 verbosity() = silent |	verbose

	      Calls names(Host)	for all	hosts that are specified in the	Erlang
	      host  file  .hosts.erlang, collects the replies, and then	evalu-
	      ates ping(Node) on all those nodes.  Returns  the	 list  of  all
	      nodes that are successfully pinged.

	      Arg  defaults  to	silent.	If Arg == verbose, the function	writes
	      information about	which nodes it is pinging to stdout.

	      This function can	be useful when a  node	is  started,  and  the
	      names of the other network nodes are not initially known.

	      Returns {error, Reason} if host_file() returns {error, Reason}.

       world_list(Hosts) -> [node()]

       world_list(Hosts, Arg) -> [node()]


		 Hosts = [atom()]
		 Arg = verbosity()
		 verbosity() = silent |	verbose

	      Same  as	world/0,1, but the hosts are specified as argument in-
	      stead of being read from .hosts.erlang.

       File .hosts.erlang consists of a	number of host names written as	Erlang
       terms.  It is looked for	in the current work directory, the user's home
       directory, and $OTP_ROOT	(the root directory of	Erlang/OTP),  in  that

       The  format  of	file .hosts.erlang must	be one host name per line. The
       host names must be within quotes.


       ^ (new line)

Ericsson AB			  kernel 6.3			    net_adm(3)


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