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From: Mel Flynn <mel.flynn+fbsd.questions@mailing.thruhere.net>
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Date: Mon, 30 Mar 2009 23:09:10 +0200
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Message-Id: <200903302309.11020.mel.flynn+fbsd.questions@mailing.thruhere.net>
Cc: Charles Howse <chowse@charter.net>
Subject: Re: analyzing httpd-error.log
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On Monday 30 March 2009 22:55:35 Charles Howse wrote:

> grep "$date" httpd-error.log | grep -v 192.168.254.254 | grep -v
> 192.168.254.3 > /root/err.log

Using pcregrep, installed by devel/pcre, typically available on apache 
systems:
pcregrep "$date.* \[client (?!192\.168\.254)" /var/log/httpd-error.log | \
	mail -s"Error log for $date" charles

Should work. As far as I know, look ahead assertions aren't supported by re(7) 
or the extended version.
-- 
Mel