Re: Test failures with GNU grep 2.23

> Yeah, I'd worry that "-a" is not portable. OTOH, BSD grep seems to have
> it, so between that and GNU, I think most systems are covered. We could
> do:
>
>   test_lazy_prereq GREP_A '
> 	echo foo | grep -a foo
>   '
>
> and mark these tests with it. I'd also be happy to skip that step and
> just do it if and when somebody actually complains about a system
> without it (I wouldn't be surprised if most people on antique systems
> end up installing GNU grep anyway).
>
> Another option might be using "sed -ne '/^author/p'" or similar. But
> that may very well just be trading one portability problem for another.