GNU bug report logs - #27803
dd by default prints output to stderr instead of stdout

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From: help-debbugs <at> gnu.org (GNU bug Tracking System)
To: Eric Blake <eblake <at> redhat.com>
Cc: tracker <at> debbugs.gnu.org
Subject: bug#27803: closed (dd by default prints output to stderr instead
 of stdout)
Date: Mon, 24 Jul 2017 15:14:03 +0000

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Your message dated Mon, 24 Jul 2017 10:13:20 -0500
with message-id <1bbee072-3790-0581-2262-8775cbfb2dba <at> redhat.com>
and subject line Re: bug#27803: dd by default prints output to stderr instead of stdout
has caused the debbugs.gnu.org bug report #27803,
regarding dd by default prints output to stderr instead of stdout
to be marked as done.

(If you believe you have received this mail in error, please contact
help-debbugs <at> gnu.org.)


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27803: http://debbugs.gnu.org/cgi/bugreport.cgi?bug=27803
GNU Bug Tracking System
Contact help-debbugs <at> gnu.org with problems

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From: vasanth kumar <cvasanth2707 <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: dd by default prints output to stderr instead of stdout
Date: Mon, 24 Jul 2017 20:04:27 +0530

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Hi,

When I run a dd command successfully, it actually  prints I/O statistics to
standard error and not stdout . Is not it suppposed to print it on stdout
by default for a good run?

Thanks,
Vasanth

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From: Eric Blake <eblake <at> redhat.com>
To: vasanth kumar <cvasanth2707 <at> gmail.com>, 27803-done <at> debbugs.gnu.org
Subject: Re: bug#27803: dd by default prints output to stderr instead of stdout
Date: Mon, 24 Jul 2017 10:13:20 -0500

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tag 27803 notabug
thanks

On 07/24/2017 09:34 AM, vasanth kumar wrote:
> Hi,
> 
> When I run a dd command successfully, it actually  prints I/O statistics to
> standard error and not stdout . Is not it suppposed to print it on stdout
> by default for a good run?

No, POSIX requires that it print stats to stderr.
http://pubs.opengroup.org/onlinepubs/9699919799/utilities/dd.html
"STDERR

    On completion, dd shall write the number of input and output blocks
to standard error...."

Therefore, the behavior is intentional, and I'm closing this as not a
bug.  However, feel free to reply to this thread if you have further
questions on the topic.

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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