[erlang-questions] Detailed usage about the erl -detached, -remsh, run_erl, to_erl

Barco You <>
Thu Apr 12 12:49:06 CEST 2012


Hi Erik,

Thank you so much for your quick response!

At least I can start practicing them now!

Barco

On Thu, Apr 12, 2012 at 6:39 PM, Erik Søe Sørensen <>wrote:

> Den 12. apr. 2012 12.26 skrev Barco You <>:
>
> Dear Erlangers,
>>
>> Although erlang doc has descriptions regarding these commands, but it's
>> difficult to know how to use them in practice.
>>
>> I googled but cannot find details of their usage.
>>
>> Hope I can find answers at least for the following issues:
>>
>> 1. by using "erl -detached", if not indicating "-setcookie", how can I
>> connect to this node console by using "-remsh"?
>>
> The default cookie has the value in the file ~/.erlang.cookie. (This file
> is generated automatically with a random value, in case it doesn't exists.)
>
>
>> 2. After successfully connect to the console of "erl -detached" through
>> "-remsh" how can I quit from the console but keep the node still running
>> which started by "erl -detached"?
>>
> Ctrl-g, then 'q'.
> (Or '?' to get a list of options.)
>
> 3. If use run_erl to start a node, how can I connect to its console
>> through "to_erl"? needing to indicate "-setcookie"?
>>
> run_erl uses a pipe file for communication. You specify the filename of
> that pipe when you start to_erl.
>   $ to_erl -help
>   Usage: to_erl [-h|-F] [pipe_name|pipe_dir/]
> It appears that '/tmp/erlang.pipe' is the default.
>
>
>> 4. Same as question 2, how to quit the to_erl without interrupting the
>> node started by "run_erl"?
>>
> Ctrl-D - which means "end-of-file" on Unix. I don't know if it's different
> on Windows.
>
> 5. What's the difference between these to way to start erl program at
>> backgroud?
>>
> How to attach to them, certainly. And possibly also something about
> logging. I don't know the complete answer.
>
> Appreciate all kinds of answers!
>
>
> The above is mostly of the "off-the-top-of-my-head" kinds :-)
>
> /Erik
>
>
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