[erlang-bugs] Encoding of IO devices when there is -noshell

José Valim <>
Thu Apr 10 19:18:57 CEST 2014

Hello OTP team,

I am using Erlang 17.0 and I have noticed that, if -noshell is given, the
encoding for IO devices are kept as latin:

    $ erl -eval 'io:format("~p", [io:getopts()]).'

Setting the +fnu flag doesn't change the behaviour:

    $ erl +fnu -eval 'io:format("~p", [io:getopts()]).'

I am pretty sure this behaviour is present in R16, but given the new
direction taken in 17.0, I am not sure this is an actual bug or not.

I am using Mac OS X Mountain Lion but this bug was also peer verified on

Thank you!

*José Valim*
Skype: jv.ptec
Founder and Lead Developer
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