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Date: Tue, 12 Sep 2006 12:01:58 +0100
From: Alex Zbyslaw <xfb52@dial.pipex.com>
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Cc: Liste FreeBSD <freebsd-questions@freebsd.org>
Subject: Re: Ambiguous output redirect
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bsd wrote:

> I don't understand why when I execute this script I have an  
> "Ambiguous output redirect." ?
>
>
> p0f -l 'tcp dst port 25' 2>&1 | /usr/local/sbin/p0f-analyzer.pl 2345 &

One answer would be that this is bourne shell syntax and you shell is csh.

Try

0f -l 'tcp dst port 25'  |& /usr/local/sbin/p0f-analyzer.pl 2345 &

or change your shell to a bourne shell compatible one like bash.

--Alex

PS In csh the ">&" means redirect to a file including stderr, in this 
case the file "1"; then you are telling it to also pipe to something, 
which is impossible since you just redirected to a file.