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: vasanth kumar <cvasanth2707 <at> gmail.com>
Subject: bug#27803: closed (Re: bug#27803: dd by default prints output to
 stderr instead of stdout)
Date: Mon, 24 Jul 2017 15:14:03 +0000

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Your bug report

#27803: dd by default prints output to stderr instead of stdout

which was filed against the coreutils package, has been closed.

The explanation is attached below, along with your original report.
If you require more details, please reply to 27803 <at> debbugs.gnu.org.

-- 
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: 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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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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