bug#58468: bug in my tr, version (GNU coreutils) 9.1

[Chris Elvidge]

On 11/10/2022 23:47, Anton Wessel wrote:
> in OS KNOPPIX 9.1
>
> your email:
> +++++
>
> Verzeichnis: Anton_Wessel@t-onli…/INBOX
> Betreff: Welcome to the "Bug-coreutils" mailing list (Digest mode)
> Von: bug-coreutils-request@gnu.org
> An: Anton_Wessel@t-online.de
> Datum: 12. Okt.  00:19
> Reply-To: bug-coreutils-request@gnu.org
> Message-ID: <mailman.163.1665526797.1198.bug-coreutils@gnu.org>
> Größe: 3,29 KB
>
>
> -----
>
> test:
>
> echo -e "a\n\nb" | tr -s '\n'
>
> or
>
> echo -e "a\n\nb" | tr -s '\n' '\n'

You have only one empty line! You need 3 \n to get two empty lines.

$ echo -e "a\n\n\nb"
a


b


> both empty lines are removed, not only one.
>
> Please: is there a wayaround known?
>
>
> Regards
>
> Anton_Wessel@t-online.de

Put your output through hexdump -c
You will see:

$ echo -e "a\n\n\nb" | hexdump -c
0000000   a  \n  \n  \n   b  \n
0000006

$ echo -e "a\n\n\nb" | tr -s '\n' | hexdump -c
0000000   a  \n   b  \n
0000004