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Oops, Paul is right here - I asked bug-coreutils@gnu.org, and Paul
responds:
<quote>
Re: bug#8578: 8.12 and 8.10 'ls -dl' appends ' ' (0x20: space) to file output lines
From: Paul Eggert <eggert@cs.ucla.edu> (UCLA Computer Science Department)
 To: jason.vas.dias@gmail.com
 CC: 8578@debbugs.gnu.org
Date: 2011年04月28日 20:34
 
On 04/28/11 11:34, Jason Vas Dias wrote:
> $ ls -dl /. | od -cx
> ...
> 0000040 r 2 0 1 5 : 2 8 / . \n
> 2072 3032 3120 3a35 3832 2f20 0a2e
> 0000056
> 
> Please could the ls developer let me know if it 100% POSIXLY correct
> that ls appends 0x20 to the filename '/.' here ?
I don't see any space appended there. The last four bytes of
output are 0x20, 0x2f, 0x2e, 0x0a (space, /, ., newline).
Perhaps you're misunderstanding the little-endian nature of
od -x output?
</quote>
Yes, of course, when 'od' says ' 2f20 0a2e' it means it received:
 0x20 0x2f 0x2e 0x0a
sorry - I'm just trying to understand why your original RE fails -
it isn't because of the spaces !