GNU bug report logs - #17032
side effect bug...

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Message #10 received at 17032-done <at> debbugs.gnu.org (full text, mbox):

From: Jim Meyering <jim <at> meyering.net>
To: Roméo Capulet <p-pioneer-q <at> gmx.fr>
Cc: 17032-done <at> debbugs.gnu.org
Subject: Re: bug#17032: side effect bug...
Date: Tue, 18 Mar 2014 08:59:39 -0700

tags 17032 + notabug
thanks

On Mon, Mar 17, 2014 at 9:41 PM, Roméo Capulet <p-pioneer-q <at> gmx.fr> wrote:
> The option "-n" have a side effect with the option "-P" and the regexp
> '^\r$', the line numbers got overwritten by the carriage return char so
> these don't appear on output.
>
> cmd ex: grep -Pn '^\r$' file.txt
>
> ps: I know I can see the numbers by redirecting output in a file.

Thanks for the report.
You can avoid that in at least two ways: either filter out all \r bytes
or filter through something like cat -A that renders them another way:

  grep -Pn '^\r$' file.txt | tr -d '\r'

or

  grep -Pn '^\r$' file.txt | cat -A

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