tcpdump | grep pattern > capture nothing got

[Florent Peterschmitt]

Hi,

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.

It's very very strange…

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