On 8/7/06, list user <xktnniuymlla@xxxxxxxxxxxxxx> wrote:
Marko Vojinovic wrote:
> I am writing a bash script to discover a MAC address of a remote host based on
> it's IP. Found that arping might be useful (is there a better method?), so I
> get
>
> # arping -f -I eth0 $ipnumber
> ARPING 10.0.0.3 from 10.0.0.1 eth0
> Unicast reply from 10.0.0.3 [00:0C:29:C8:DE:E2] 1.040ms
> Sent 1 probes (1 broadcast(s))
> Received 1 response(s)
>
> but the problem is that I just need to set the variable, say macaddr, to the
> above value, hopefully lowercase, without the [ and ]. Next obvious thing
> was:
>
> # arping -f -I eth0 $ipnumber | grep Unicast
> Unicast reply from 10.0.0.3 [00:0C:29:C8:DE:E2] 1.040ms
>
This worked at the command line when I tested it:
$ ip=$(/sbin/arping -f -I eth0 10.255.255.1 | grep Unicast | awk
'{print $5}' | sed 's/\[/ /' | sed 's/\]/ /');echo $ip
So in a script remove the last command ";echo $ip" (and the bash $
prompt at the beginning is just that, a prompt) and you are in
business.
Jacques B.
