Date: Sun, 04 Nov 2007 01:12:45 +0100 From: deeptech71@gmail.com To: freebsd-questions@freebsd.org Subject: reverse grep Message-ID: <472D0E7D.6050209@gmail.com>
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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
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