Subject: --line-buffered option doesn't work with --files-with-matches

From: "Louis S." <[email-masked]>
Date: Thu, 16 Oct 2014 23:16:30 +0200

Hi, I'm not quite sure this is a bug but it appears that the
--line-buffered option has no effect when used in conjunction with
--files-with-matches.
Here are some tests I ran with grep 2.20:
$ time for i in {1..100}; do grep --line-buffered -Rl gnome /usr/ |
head -n1 >& /dev/null; done
real    0m54.831s
user    0m37.077s
sys     0m17.550s

$ time for i in {1..100}; do grep -Rl gnome /usr/ | head -n1 >& /dev/null; done
real    0m54.858s
user    0m36.987s
sys     0m17.657s

$ time for i in {1..100}; do grep --line-buffered -R gnome /usr/ |
head -n1 >& /dev/null; done
real    0m7.414s
user    0m4.727s
sys     0m2.613s

Please let me know if line-buffering is supposed to work in that case.

Regards,

Louis