bug#63819: Gnu `grep '.*'` does not match an empty string.

[Paul Eggert]

On 2023-05-31 19:17, Bob Vincent Il (US) wrote:
> Okay, but `echo ''` does not output an empty string. It outputs a line feed 
> character.

The line feed is not considered. Grep looks only for matches of "any 
part of the line excluding the terminating <newline>" 
<https://pubs.opengroup.org/onlinepubs/9699919799/utilities/grep.html>.

Closing the bug report as it appears to be due to a misunderstanding of 
how 'grep' works.