Subject: Re: bug#17032: side effect bug...

From: Jim Meyering <[email-masked]>
Date: Tue, 18 Mar 2014 08:59:39 -0700

tags 17032 + notabug
thanks

On Mon, Mar 17, 2014 at 9:41 PM, Roméo Capulet <[email-masked]> 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