bash scripting

[mss]

Hi I am trying to write a script that would look at the result of arp -a and get the MAC address of an ipaddress.
Here is what I have.

arp -a | awk '192.168.0.$LASTDIGIT {print $4}'

I get an error message saying

awk: 1: unexpected character '.'

Any ideas,
thanks

[anomie]

Try:

arp -a | awk '/192.168.0./{ print $4 }'

That'll print MAC address for everything arp displays in the /24 network.

What is it you're trying to do with $LASTDIGIT? Expand a variable you've assigned a value to in the shell? If so, then use:

arp -a | awk '/192.168.0.'"$LASTDIGIT"'/{ print $4 }'

(make sure you copy that exactly.)