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

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Message #7 received at control <at> debbugs.gnu.org (full text, mbox):

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

[Message part 1 (text/plain, inline)]

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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