[erlang-questions] Simple Logging

Dmitry Kolesnikov <>
Mon Feb 3 23:06:28 CET 2014


You are looking for +W flag, e.g. erl +W i should make a trick for you.

+W w | i
Sets the mapping of warning messages for error_logger. Messages sent to the error logger using one of the warning routines can be mapped either to errors (default), warnings (+W w), or info reports (+W i). The current mapping can be retrieved using error_logger:warning_map/0. See error_logger(3) for further information.

However, I would still advice to use lagger. It is compatible with error_logger framework and nicely cooperates with legacy code. Long time ago, I’ve passed through your dilemma, as the result. I’ve end-up with lagger.

BTW, I am also confused with goldrush dependencies in lager. I guess it is used to manage flow control to std io.

- Dmitry

On 03 Feb 2014, at 23:29, Niklas Semmler <> wrote:

> The code I am working on is supposed to be integrated with a bigger system later on. As far as I know the other system uses native logging.
> That's why I want to avoid Lager. I would rather work out my own get_event..
> -- Niklas 
> On Feb 3, 2014, at 9:51 PM, Jesper Louis Andersen wrote:
>> On Mon, Feb 3, 2014 at 7:20 PM, Niklas Semmler <> wrote:
>>> PS: Lager is unfortunately not an option as I have to avoid any
>>> unnecessary dependencies.
>> You really want lager for this. What is the rationale for avoiding an
>> unnecessary dependency?
>> -- 
>> J.
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