I'm not crazy about the suggestion to use /etc/dhcp/.cache, it's like trying
to access a private member variable of a class that you really shouldn't be
in.
What is the 'acceptable' way with dhcp is to use the scripting that is
supported inherently. Just by adding a 'script' block to your dhcp config
file, you get access not only to the new ip address, but the wealth of
information that comes back via dhcp (i.e. the old ip address when changing,
routing info, dns info, etc.). The sample script provided (in /etc/dhcp)
shows how you can get access to these values.
So the OP's cleanest option is to use this script to output the new IP
address into a file if that's where he needs it to go.
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