#!/bin/bash

LC_ALL="C"

conf='/m23/etc/netmask.override'
if [ -f $conf ]
then
	cat $conf
	exit 0
fi

/sbin/ifconfig | egrep "(eth|enp|ens|br0)" -A1 | sed "s/  /\n/g"  | egrep "(^Mask|^netmask)" | sed "s/^.*[ :]//" | sed 's/[^0-9.]//g' | head -1