GNU bug report logs - #23277
md5sum: Output broken when filename contains \n

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ulrich Sibiller <u.sibiller <at> science-computing.de>
To: bug-coreutils <at> gnu.org
Subject: md5sum: Output broken when filename contains \n
Date: Tue, 12 Apr 2016 15:17:57 +0200

Hello,

I observe a strange behaviour for {md5,sha1,sha512}sum on RHEL 6.7:

# sha512sum dat_files/1.000e-01*dat
a66f6f8f8da256d07330a17bea942bba9584e182799dce2a42bc7e882d4d9267c40568644d7f5b63128b286a6393764fc599cc30f687b8dacf86e0a96d87795c 
 dat_files/1.000e-01.dat
\a66f6f8f8da256d07330a17bea942bba9584e182799dce2a42bc7e882d4d9267c40568644d7f5b63128b286a6393764fc599cc30f687b8dacf86e0a96d87795c 
 dat_files/1.000e-01\n.dat

The second file has \n in the name and the output gets a backslash prepended which looks wrong to me.

Kind regards,

Ulrich Sibiller
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Message #12 received at 23277-done <at> debbugs.gnu.org (full text, mbox):

From: Eric Blake <eblake <at> redhat.com>
To: Ulrich Sibiller <u.sibiller <at> science-computing.de>,
 23277-done <at> debbugs.gnu.org
Subject: Re: bug#23277: md5sum: Output broken when filename contains \n
Date: Tue, 12 Apr 2016 09:37:47 -0600

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

tag 23277 notabug
thanks

On 04/12/2016 07:17 AM, Ulrich Sibiller wrote:
> Hello,
> 
> I observe a strange behaviour for {md5,sha1,sha512}sum on RHEL 6.7:
> 
> # sha512sum dat_files/1.000e-01*dat
> a66f6f8f8da256d07330a17bea942bba9584e182799dce2a42bc7e882d4d9267c40568644d7f5b63128b286a6393764fc599cc30f687b8dacf86e0a96d87795c
>  dat_files/1.000e-01.dat
> \a66f6f8f8da256d07330a17bea942bba9584e182799dce2a42bc7e882d4d9267c40568644d7f5b63128b286a6393764fc599cc30f687b8dacf86e0a96d87795c
>  dat_files/1.000e-01\n.dat
> 
> The second file has \n in the name and the output gets a backslash
> prepended which looks wrong to me.

Thanks for the report, but the behavior you are seeing is documented as
intentional.  This is so that a newline in a filename is unambiguously
parseable via an escape sequence (the leading \ tells you that escape
sequences will be present).  As the manual mentions that this is
intentional behavior, I'm closing this as not a bug, but feel free to
respond with further comments.

-- 
Eric Blake   eblake redhat com    +1-919-301-3266
Libvirt virtualization library http://libvirt.org

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