Date: Thu, 21 Nov 2013 09:08:07 +0100 From: Florent Peterschmitt <florent@peterschmitt.fr> To: Dimitry Andric <dim@FreeBSD.org> Cc: freebsd-stable stable <freebsd-stable@freebsd.org> Subject: Re: tcpdump | grep pattern > capture nothing got Message-ID: <528DBF67.1090107@peterschmitt.fr> In-Reply-To: <966AFB1F-D273-4754-96AC-01298FBF6F42@FreeBSD.org> References: <528D0302.7090906@peterschmitt.fr> <966AFB1F-D273-4754-96AC-01298FBF6F42@FreeBSD.org>
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[-- Attachment #1 --] On 20/11/13 23:38, Dimitry Andric wrote: > On 20 Nov 2013, at 19:44, Florent Peterschmitt <florent@peterschmitt.fr> wrote: >> I use FreeBSD 10.0-BETA3 amd64, upgraded from 9.2-RELEASE with >> freebsd-update. >> >> I was capturing with tcpdump and doing some grep on it: >> >> # tcpdump -li nfe0 port 53 | grep Refused > capture.txt >> >> I was surprised that capture.txt is totally empty. If I don't redirect >> the output, then it writes what I need on stdout. > > Try grep --line-buffered instead (which incurs a performance penalty, > but you probably don't care in this case). > > BSD grep also supports this option. > > -Dimitry > It works, thank you. But, I didn't have to do this on a GNU/Linux machine. Is that normal? -- Florent Peterschmitt | Please: florent@peterschmitt.fr | * Avoid HTML/RTF in E-mail. +33 (0)6 64 33 97 92 | * Send PDF for documents. http://florent.peterschmitt.fr | * Trim your quotations. Really. Proudly powered by Open Source | Thank you :) [-- Attachment #2 --] -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.22 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJSjb9nAAoJEFr01BkajbiBstwP/RHqpeQ6cn0aQoShi9WhAdnp Tnwy81iQM1iqB7UTUNZntOCeu5ZHypBZihSPItMxLp8pvHSdMV44lPmGNPqld6Xk xnGGDosnmo9pZq0i9+I6NnASsd73U4WxUs80G2qqGSlRq+IiXRfkTmuNkDAvVdjT GMGjATt9XA+GB8J1Ou3vdb+lAo5QTOY2JQU2prdp/Qv/5kBnA3khVGx9ND/k+CWF cw13zRdjhbiIXseCVFwGl1WMDKVLpHh1a47IZzEBfEWpD0OnAzGqmyrS1r4NgFiB EkWv/+mKVoQ9lgg+YNeOxgw7JySe3vm8MOtjTJiRf1BKcOmLKhAg4EvU3uXAkbYu 7WK/RaawXeKkkC2xV3FS/v0RBnnibG0/BAyDkD5rpiovDUqxOx5fpBo6OgyLxEVy wazrHBQ7L0Zv8Xlhbi4U2CKTpTIEgDDXhxY1rB/tQXv5q2LE6V/ZdwZ37OnXOTE/ 6b1EdV/6WHZFou8Rcd89KnV53BGohgUSOq3RDMfuVUI9c+rZIeDoNLGvRYBLdyMz mlA+SuuP/FLDPQg2u52UM9tGPk23w3FCChk8QyztU5TPBXwpYSGt07IGKlnXhji8 Er+NRY+uz6b4C9/Ni4Zlnk/N4VIC1HGGt+mccQaG0hbDUC5ms5ZKkONKFZ289sWZ olEGCQ33u/AsmWpJum1V =iv1/ -----END PGP SIGNATURE-----
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