On 07/02/2021 13:08, KenichiroMATOHARA wrote:
> Package: coreutils
> Version: 8.32-4+b1
> Severity: minor
> 
> Dear Maintainer,
> 
> When I create a text file with a newline code of "\r\n" and
> `cat` with the `-E, --show-ends` option, "$" is displayed at
> the beginning of the line.
> When `-A, --show-all` is used, it looks normal.
> 
> 
> - Create a file for \r\n
>> $ echo 'foo
>>>      $ od -c dos.txt
>> 0000000   f   o   o  \r  \n  \t   b   a   r  \r  \n
>> 0000013
>>    bar' | tr '\n' '\r\n' > dos.txt
> 
> - `-E, --show-ends` option
>> $ cat -E dos.txt
>> $oo
>> $       bar
>> $ cat -nE dos.txt
>> $    1  foo
>> $    2          bar
> 
> - `-A, --show-all` option
>> $ cat -A dos.txt
>> foo ^M$
>> ^Ibar^M$
>> $ cat -nA dos.txt
>>       1  foo^M$
>>       2  ^Ibar^M$

I agree the current behavior is less than useful because:

   * \r\n is common a line end combination
   * catting such a file without options causes it to display normally
   * overwriting the first char with $, loses info

I propose to change the upstream coreutils project
as per the attached, to extend the --show-ends option
to show \r as ^M when the following character is \n.

thanks,
Pádraig