bug#69929: Can grep -q report matches in incomplete lines?

[jackson]

Paul Eggert wrote:
> although doable it would be a bit of a pain to program

yup - sure would be a pain.

If you're not sure whether your actual input of interest will end
in a newline, can you add one, to "feed grep's newline hunger",
thus for instance replacing your example:

  grep -q foo <(sh -c 'printf foo ; sleep 30' &)

with:

  grep -q foo <(sh -c 'printf foo ; echo ; sleep 30' &)

In any case, grep is quite line oriented, as implied by an early
sentence in the man page grep(1):

"PATTERNS is one or more patterns separated by newline characters,"

-- 
  Paul Jackson
  jackson@fastmail.fm