Ports communication through IPC

[Willian Frantz]

Just realized that BEAM supports communication with external processes using Named Pipes through Ports.

```

terminal> mkfifo name.pipe

iex> pid = Port.open('name.pipe', [:eof])

iex> Port.command(pid, "Sending data through a pipe to whoever is listening to...\n")
```

I was testing and trying to understand whether this could be a reliable feature for IPC.

But didn't found any docs about this, both Erlang and Elixir only states the tuples as first arguments with :spawn, :spawn_driver, :spawn_executable and :fd.

Is there a reason for this to be unknown? maybe future plans for deprecation or something... If that's not the case I would like to work on some docs for it.

[José Valim]

IIRC it is a relatively recent features. You should reach out to the Erlang team on erlangforum.com.

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