Find internal IP address with BASH

Question

I am already aware of many ways of getting your internal IP (ifconfig, ip addr, /etc/hosts, etc), but I am trying to write a bash script that will always return the internal IP. The problem is, many one-liners (/sbin/ifconfig|grep inet|head -1|sed 's/\:/ /'|awk '{print $3}') can return multiple IPs, and I need to distinguish the internal one manually.

I suspect that to the computer, there is no difference between and an external IP and an internal IP, and thus no 100%, guaranteed way to get the right IP.

The end result is that this script will return the internal IP, no matter if its a 192 address or a 204 address, etc.

Thanks in advance.

Answer 1

"hostname -i" should hopefully give you the same result