Date: Wed, 4 Aug 2010 18:28:10 +0200 From: Lars Engels <lars.engels@0x20.net> To: Alexandre Sunny Kovalenko <gaijin.k@ovi.com> Cc: poyopoyo@puripuri.plala.or.jp, Gabor Kovesdan <gabor@FreeBSD.org>, current@FreeBSD.org Subject: Re: bsdgrep does not work with tail -f | grep combination Message-ID: <20100804162809.GE59909@e.0x20.net> In-Reply-To: <1280933468.2752.2.camel@RabbitsDen> References: <86eiefhalp.wl%poyopoyo@puripuri.plala.or.jp> <4C585E44.5030608@FreeBSD.org> <1280933468.2752.2.camel@RabbitsDen>
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--6zdv2QT/q3FMhpsV Content-Type: text/plain; charset=utf-8 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On Wed, Aug 04, 2010 at 10:51:08AM -0400, Alexandre Sunny Kovalenko wrote: > On Tue, 2010-08-03 at 20:21 +0200, Gabor Kovesdan wrote: > > Em 2010.08.03. 19:25, poyopoyo@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] > > > > > > =3D=3D=3D=3D=3D > > > > > > with GNU grep: > > > > > > term0$ tail -f /tmp/1 | gnugrep 0 > > > 10 > > > otherterm$ jot 10>> /tmp/1 > > > [on term0] > > > 10 > > > 10 > > > =20 > > I've checked on 8.0 and GNU grep doesn't output anything either for me.= =20 > > If you use tail -f, you will enter more lines and end it with EOF, won'= t=20 > > you? And then BSD grep will process the input and print out matches. I= =20 > > don't think it's bad behaviour in itself but if you can explain why you= =20 > > think it's bad I'm willing to change it. > >=20 > I am not sure it is specific to the GNU grep -- below is the example > from AIX 5.3: [...] Same on Solaris, so this is not a GNU feature. --6zdv2QT/q3FMhpsV Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.9 (FreeBSD) iEYEARECAAYFAkxZlRkACgkQKc512sD3afhQrQCgoE4GxiQmoobdban3avHI2zGu rbcAn26hNf8hVKMvdwJyTtS2mNWkVyMf =oUJC -----END PGP SIGNATURE----- --6zdv2QT/q3FMhpsV--
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