On Tue, 3 Aug 2010, Gabor Kovesdan wrote: > Em 2010.08.03. 19:25, poyopoyo_at_puripuri.plala.or.jp escreveu: >> Hi, >> >> It seems bsdgrep does not work when piped from tail -f. >> I'm running r210728. >> >> term0$ jot 10> /tmp/1 >> term0$ tail -f /tmp/1 | grep 0 >> [no output] >> >> otherterm$ jot 10>> /tmp/1 >> [no output to term0] >> >> ===== >> >> with GNU grep: >> >> term0$ tail -f /tmp/1 | gnugrep 0 >> 10 >> otherterm$ jot 10>> /tmp/1 >> [on term0] >> 10 >> 10 >> > I've checked on 8.0 and GNU grep doesn't output anything either for me. If > you use tail -f, you will enter more lines and end it with EOF, won't you? > And then BSD grep will process the input and print out matches. I don't think > it's bad behaviour in itself but if you can explain why you think it's bad > I'm willing to change it. On 8.1, GNU grep (from system) and FreeGrep (personal repo with my fastcomp changes) both output the '10' from this test. Are you sure you ran GNU grep on that system and did not accidentally run a copy of BSD grep? With bsdgrep in HEAD, I think it is not processing the input until stdio's buffer is flushed at the 8KB mark. I barely looked at the code, so I am merely surmising. Sean -- scf_at_FreeBSD.orgReceived on Wed Aug 04 2010 - 15:49:34 UTC
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