tcpdump | grep pattern > capture nothing got
Florent Peterschmitt
florent at peterschmitt.fr
Thu Nov 21 08:08:36 UTC 2013
On 20/11/13 23:38, Dimitry Andric wrote:
> On 20 Nov 2013, at 19:44, Florent Peterschmitt <florent at 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:
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