GNU bug report logs - #68892
'tr' function | Outputs printed before the command prompts

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Message #5 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Ricky Tigg <ricky.tigg <at> gmail.com>
To: bug-coreutils <at> gnu.org
Subject: 'tr' function | Outputs printed before the command prompts
Date: Fri, 2 Feb 2024 16:40:26 +0200

[Message part 1 (text/plain, inline)]

OS: Fedora v86_64. coreutils v.: 9.3. Shell: bash v. 5.2.26.

Hello. Normally outputs are printed after the command prompt; "#" "$" on my
system.

(...)@(...):~$ rpm -ql coreutils | head -2
/usr/bin/[
/usr/bin/arch

Unexpectedly, through a pipe invoking 'tr', outputs are printed before the
command prompts.

(...)@(...):~$ rpm -ql coreutils | head -2 | tr '\n' ' '
/usr/bin/[ /usr/bin/arch (...)@(...):~$

Regards.

[Message part 2 (text/html, inline)]

Message #8 received at submit <at> debbugs.gnu.org (full text, mbox):

From: Davide Brini <dave_br <at> gmx.com>
To: bug-coreutils <at> gnu.org
Subject: Re: bug#68892: 'tr' function | Outputs printed before the command
 prompts
Date: Fri, 2 Feb 2024 15:57:20 +0100

On Fri, 2 Feb 2024 16:40:26 +0200, Ricky Tigg <ricky.tigg <at> gmail.com> wrote:

> OS: Fedora v86_64. coreutils v.: 9.3. Shell: bash v. 5.2.26.
>
> Hello. Normally outputs are printed after the command prompt; "#" "$" on
> my system.
>
> (...)@(...):~$ rpm -ql coreutils | head -2
> /usr/bin/[
> /usr/bin/arch
>
> Unexpectedly, through a pipe invoking 'tr', outputs are printed before the
> command prompts.
>
> (...)@(...):~$ rpm -ql coreutils | head -2 | tr '\n' ' '
> /usr/bin/[ /usr/bin/arch (...)@(...):~$

You're removing newlines, and this causes the prompt to be displayed
immediately after the command output without an intervening newline.

--
D.

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