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bug#23562: grep seems to write some error messages to stdout data stream


From: Paul Eggert
Subject: bug#23562: grep seems to write some error messages to stdout data stream --- shouldn't it be to stderr?
Date: Tue, 22 Sep 2020 12:03:54 -0700
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0

On 5/16/16 11:03 PM, John Refling wrote:

error messages should NEVER be injected into the same stream as the
users input / output data, firstly because it corrupts the data, and
secondly if the output is redirected, the user will never see the error
message.

On further thought (and after getting other bug reports) you make a good point, and GNU grep's binary-file diagnostics will be sent to stderr instead of stdout starting with the next release. See:

https://git.savannah.gnu.org/cgit/grep.git/commit/?id=271793f09cc604ad54ad89b18110716555cc748b





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