Thanks Eric .I got the answer.

On Mon, Jul 24, 2017 at 8:43 PM, Eric Blake <eblake@redhat.com> wrote:

> 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
>
>