shell_default(3erl) Erlang Module Definition shell_default(3erl)NAME
shell_default - Customizing the Erlang Environment
DESCRIPTION
The functions in shell_default are called when no module name is given in a shell command.
Consider the following shell dialogue:
1 > lists:reverse("abc").
"cba"
2 > c(foo).
{ok, foo}
In command one, the module lists is called. In command two, no module name is specified. The shell searches the modules user_default fol-
lowed by shell_default for the function foo/1 .
shell_default is intended for "system wide" customizations to the shell. user_default is intended for "local" or individual user customiza-
tions.
HINT
To add your own commands to the shell, create a module called user_default and add the commands you want. Then add the following line as
the first line in your .erlang file in your home directory.
code:load_abs("$PATH/user_default").
$PATH is the directory where your user_default module can be found.
Ericsson AB stdlib 1.17.3 shell_default(3erl)
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net_adm(3erl) Erlang Module Definition net_adm(3erl)NAME
net_adm - Various Erlang Net Administration Routines
DESCRIPTION
This module contains various network utility functions.
EXPORTS
dns_hostname(Host) -> {ok, Name} | {error, Host}
Types Host = atom() | string()
Name = string()
Returns the official name of Host , or {error, Host} if no such name is found. See also inet(3erl) .
host_file() -> Hosts | {error, Reason}
Types Hosts = [Host]
Host = atom()
Reason = term()
Reads the .hosts.erlang file, see the section Files below. Returns the hosts in this file as a list, or returns {error, Reason} if
the file could not be read. See file(3erl) for possible values of Reason .
localhost() -> Name
Types Name = string()
Returns the name of the local host. If Erlang was started with the -name command line flag, Name is the fully qualified name.
names() -> {ok, [{Name, Port}]} | {error, Reason}
names(Host) -> {ok, [{Name, Port}]} | {error, Reason}
Types Name = string()
Port = int()
Reason = address | term()
Similar to epmd -names , see epmd(1) . Host defaults to the local host. Returns the names and associated port numbers of the Erlang
nodes that epmd at the specified host has registered.
Returns {error, address} if epmd is not running. See inet(3erl) for other possible values of Reason .
(arne@dunn)1> net_adm:names().
{ok,[{"arne",40262}]}
ping(Node) -> pong | pang
Types Node = node()
Tries to set up a connection to Node . Returns pang if it fails, or pong if it is successful.
world() -> [node()]
world(Arg) -> [node()]
Types Arg = silent | verbose
This function calls names(Host) for all hosts which are specified in the Erlang host file .hosts.erlang , collects the replies and
then evaluates ping(Node) on all those nodes. Returns the list of all nodes that were, 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 nodes in the network are not initially known.
Failure: {error, Reason} if host_file() returns {error, Reason} .
world_list(Hosts) -> [node()]
world_list(Hosts, Arg) -> [node()]
Types Hosts = [Host]
Host = atom()
Arg = silent | verbose
As world/0,1 , but the hosts are given as argument instead of being read from .hosts.erlang .
FILES
The .hosts.erlang file 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 order.
The format of the .hosts.erlang file must be one host name per line. The host names must be within quotes as shown in the following exam-
ple:
^ (new line)
Ericsson AB kernel 2.14.3 net_adm(3erl)