Re: [Grep-devel] grep-2.27 released [stable]

[Dmitry V. Levin]

On Wed, Dec 07, 2016 at 04:30:02PM +0100, Vincent Lefevre wrote:
> On 2016-12-06 23:46:30 -0800, Jim Meyering wrote:
> >   grep by default now reads all of standard input if it is a pipe,
> >   even if this cannot affect grep's output or exit status.  This works
> >   better with nonportable scripts that run "PROGRAM | grep PATTERN
> >   >/dev/null" where PROGRAM dies when writing into a broken pipe.
> >   [bug introduced in grep-2.26]
> 
> This seems a bad idea. Do this mean that
> 
>   while true; do echo foo; done | grep . | head
> 
> will never terminate?

No, but it probably means that

        yes | grep --quiet . || echo yes or grep failed

will never terminate.


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