Re: [PATCH 19/22] t/t8*: merge "grep | sed" pipelines

> Junio C Hamano wrote:
>> Isn't -E a GNUism?
>>
>> At least,
>>
>>      https://pubs.opengroup.org/onlinepubs/9699919799/utilities/sed.html
>>
>> does not seem to have it (we may need to fix t6030 to rid its only
>> existing use).
> 
> I _thought_ that -r was the GNUism.  The GNU sed-4.8 manpage
> says:
> 
>      -E, -r, --regexp-extended
>          use extended regular expressions in the script
>          (for portability use POSIX -E).
> 
> That doesn't mean the man page is right, of course. :)
> 
> https://www.austingroupbugs.net/view.php?id=528 suggests
> that -E has been adopted and, importanly, is more widely
> supported than -r (if we were considering using that rather
> than rewriting this to not use ERE syntax).  MacOS in
> particular supports -E but not -r, according to that link.
> 
> It seems like the documentation hasn't quite caught up to
> reality yet, perhaps?
>