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From: LGUC <lguribec@gmail.com>
Subject: Bug report for 'head' (and 'wc' et. al.)
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<html>
<body>
Caracas, Sunday 26th, 2014<br><br>
Ref: <font color="#0000FF"><b><u>Bug report for 'head' (<i>and 'wc' et.
al.</i>)<br><br>
</u></b></font>Dear friends:<br><br>
&nbsp; Please find attached the text file
'<b><u>head-tst.txt</u></b>'<br>
&nbsp; <br>
&nbsp; As you easily can see, the following command fails and do not
print<br>
anything, even if the file has:&nbsp; 6 lines,&nbsp; 49 words and&nbsp;
250 chars:<br><br>
&nbsp; '<b>head -n -0 head-tst.txt</b>'<br><br>
&nbsp; The last line on the file does NOT end with a '\n', and this
seems<br>
to be the base of the problem. If you add the last '\n', 'head'
works<br>
pretty fine.<br><br>
&nbsp; So this seems to be a problem with the definition of a 'text
line':<br>
I guess that a line that has around 68 normal chars and 13 spaces,
is<br>
a good candidate to be considered as a line.<br><br>
&nbsp; I found the same problem in several other core utils, being
the<br>
most remarcable 'wc'. If you executes:<br><br>
&nbsp; '<b>wc head-tst.txt</b>'<br><br>
&nbsp; you will get:<br><br>
&nbsp;&nbsp;&nbsp; <font color="#FF0000"><b>5</b></font>&nbsp; 49 250
head-tst.txt<br><br>
&nbsp; what is wrong, as the file has <b><u>six (6)</u></b> lines instead
of five (5).<br>
The last one lines is missing due to the fact that it does not<br>
include a '\n' at the end.<br><br>
&nbsp; In 1998 I fix 'wc', and I have attached 'wc-fix.c' including
only<br>
the most remarkable aspects, in case it could be of any help.<br><br>
<br>
Best regards,<br><br>
Luis G. Uribe C.<br>
<hr>
<br>
Attachments inside
'<b>head-tst<font color="#008000">.zip</b></font>':<br>
- '<font color="#800000"><b>head-tst.txt</b></font>': text file that
makes 'head' core utility to fail<br>
- '<font color="#800000"><b>wc-fix.c</b></font>':&nbsp;&nbsp;&nbsp;&nbsp;
fix to same problem, applyied to 'wc' in 1998<br><br>
Software ID:<br>
&nbsp;&nbsp; GNU coreutils 8.15&nbsp; January 2012&nbsp; HEAD(1)<br>
&nbsp;&nbsp; (Cygwin)<br>
</body>
</html>





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On 01/26/2014 03:07 PM, LGUC wrote:
>    THE INCOMPLETE ATTACMENT! (working on sunday makes not my lucky day.
>    Sorry for the inconveniences!.
>    Please disregard the previous 2 mails)
>      __________________________________________________________________
> 
>    Caracas, Sunday 26th, 2014
>    Ref: Bug report for 'head' (and 'wc' et. al.)
>    Dear friends:
>      Please find attached the text file 'head-tst.txt'
> 
>      As you easily can see, the following command fails and do not print
>    anything, even if the file has:  6 lines,  49 words and  250 chars:
>      'head -n -0 head-tst.txt'
>      The last line on the file does NOT end with a '\n', and this seems
>    to be the base of the problem. If you add the last '\n', 'head' works
>    pretty fine.

Right that's an issue, coincidentally recently reported:
http://bugs.gnu.org/16329
We'll include the fix for that soon.

>      So this seems to be a problem with the definition of a 'text line':
>    I guess that a line that has around 68 normal chars and 13 spaces, is
>    a good candidate to be considered as a line.
>      I found the same problem in several other core utils, being the
>    most remarcable 'wc'. If you executes:
>      'wc head-tst.txt'
>      you will get:
>        5  49 250 head-tst.txt
>      what is wrong, as the file has six (6) lines instead of five (5).
>    The last one line is missing due to the fact that it does not
>    include a '\n' at the end.
>      In 1998 I fix 'wc', and I have attached 'wc-fix.c' including only
>    the most remarkable aspects, in case it could be of any help.

So wc is different and is defined by POSIX to only count '\n' chars.
So we can't change that really. We might be able to add a --visible-lines
option that would handle this and also unicode line separators etc.
But that would require more debate since it would be a new option.

thanks,
Pádraig.





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