Date: Sat, 3 Nov 2007 17:37:06 -0800 From: Gary Kline <kline@tao.thought.org> To: deeptech71@gmail.com Cc: freebsd-questions@freebsd.org Subject: Re: reverse grep Message-ID: <20071104013706.GA61859@thought.org> In-Reply-To: <472D0E7D.6050209@gmail.com> References: <472D0E7D.6050209@gmail.com>
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On Sun, Nov 04, 2007 at 01:12:45AM +0100, deeptech71@gmail.com wrote: > How is it possible to select lines that do NOT match a specific pattern? > > For example, I'm connecting to 192.168.123.254 via telnet (port 23), and > do tcpdump -nli rl0. This cyclic traffic, becuase when tcpdump outputs > something, the system sends me some packets, which generates output in > tcpdump, and vice versa. I want to filter out packets of telnet access > to the FreeBSD machine, that is, something like: > > tcpdump -nli rl0 | grep --non-matching-lines 192.168.123.254.23 % tcpdump -nli rl0 | grep -v 192.168.123.254.23 will print everything except the IP you have shown. -- Gary Kline kline@thought.org www.thought.org Public Service Unix http://jottings.thought.org http://transfinite.thought.org
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