How to get the MAC address of the 'local' system given the IP address?

[Little Girl]

Hey there,

Ken D'Ambrosio wrote:

>I humbly submit you should *not* use "hostname -i":
>ken at strider ~ $ hostname -i
>127.0.1.1
>
>Not sure where it pulls that from, but localhost is probably not
>what you're really wanting, so unless you understand the mechanics,
>there's more than one way to write a script.

It's case-sensitive. A lower-case i (hostname -i) returns localhost
and an upper-case I (hostname -I) returns the LAN IP.

Here's another way to get the LAN IP by using the ip command:

ip route | grep kernel | cut -f1 -d'/'

I also had that command in my notes written this way, but can't
remember why:

ip route | grep kernel | cut -f1 -d' ' | cut -f1 -d'/'

Both give the same result on my computer, but maybe only one will
work on certain systems or networks.

-- 
Little Girl

There is no spoon.