Date: Wed, 27 Aug 2008 09:43:45 +0530 From: "N. Raghavendra" <raghu@mri.ernet.in> To: Martin McCormick <martin@dc.cis.okstate.edu> Cc: freebsd-questions@freebsd.org Subject: Re: Regular Expression Trouble Message-ID: <86od3f14ee.fsf@riemann.mri.ernet.in> In-Reply-To: <200808270312.m7R3CJNk076060@dc.cis.okstate.edu> (Martin McCormick's message of "Tue, 26 Aug 2008 22:12:19 -0500") References: <200808270312.m7R3CJNk076060@dc.cis.okstate.edu>
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At 2008-08-26T22:12:19-05:00, Martin McCormick wrote:
> I am trying to isolate only the MAC addresses that appear in
> dhcpd logs.
> For anyone who is interested, the sed construct that should do
> this looks like:
It'd be better if you post a few relevant lines of the log file.
Pending that, I suggest awk(1) in case the log file format is similar
to the following snippet of `dhcpd.leases' on an OpenBSD server:
% cat dhcpd.leases
lease 192.168.10.216 {
starts 3 2008/07/16 23:17:29;
ends 4 2008/07/17 00:17:29;
tstp 4 2008/07/17 00:17:29;
binding state free;
hardware ethernet 00:1f:c6:81:66:a6;
}
lease 192.168.10.65 {
starts 4 2008/07/17 11:15:48;
ends 5 2008/07/18 11:15:48;
tstp 5 2008/07/18 11:15:48;
binding state free;
hardware ethernet 00:16:d3:9e:eb:74;
}
% awk '/hardware ethernet/ { print substr($3, 4, 14) }' dhcpd.leases
1f:c6:81:66:a6
16:d3:9e:eb:74
Raghavendra.
--
N. Raghavendra <raghu@mri.ernet.in> | http://www.retrotexts.net/
Harish-Chandra Research Institute | http://www.mri.ernet.in/
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