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You need an init start up file that would create a /etc/issue with the resulting ip address being given by the dhcp server, each time the system boots up.

Since you are in Ubuntu you can use...

Here is inline:

A=("one" "two" "mail@yourhost.com")
B=("one" "two" "three")

for((i=0;i<${#A};i++)) {
if [[ ${A[i]} = *@* ]]
then
echo "A contains @"
fi
}
...