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:
sed 's/.*\([[ your regular expression ]]\).*/\1/'
The \1 tells sed to only print what matched and skip all the rest.
I am doing something wrong with the regular expression
that is supposed to recognise a MAC address. MAC addresses look
like 5 pairs of hex digits followed by :'s and then a 6TH pair
to end the string.
I have tried:
[[:xdigit:][:xdigit:][:punct:]
Sorry. It won't all fit on a line, but there should be a string
of 5 pairs and the : and then the 6TH pair followed by the
closing ] so the expression ends with ]]
One should also be able to put:
[[:xdigit:][:xdigit:][:punct:]]\{5,5\}[[:xdigit:][:xdigit]]
Any ideas as to what else I can try?
What happens is I get single characters per line that look like
the first or maybe the last character in that line, but
certainly nothing useful or nothing that remotely looks like a
MAC address.
Any ideas as to what's wrong with the regular
expression?
Many thanks.
Martin McCormick WB5AGZ Stillwater, OK
Systems Engineer
OSU Information Technology Department Telecommunications Services Group
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I don't have a seperate dhcp log and you didn't make it clear if you do,
but I do have something similar written for awk that parses the system
log file.
awk ' /DHCPREQUEST/ { print $10 } ' /var/log/messages
Maybe that will help.
~Paul
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