Subject: bug#54614: GNU Sed 's/.../\n/' disagreement with POSIX

From: Paul Eggert <[email-masked]>
Date: Mon, 28 Mar 2022 11:39:38 -0700

On 3/28/22 10:20, Paul Eggert wrote:
> POSIX says that this shell command:
> 
>   echo 'abc' | sed 's/b/\n/g'
> 
> should output 'anc', but with GNU Sed it outputs two lines 'a' and 'c', 
> even if POSIXLY_CORRECT is set.

Oh, a further reading of the POSIX spec indicates that the behavior is 
unspecified here. So, please ignore what I wrote about POSIXLY_CORRECT 
etc.; the current GNU Sed behavior is fine. Though it may be helpful to 
document the unportability of \n here.