#!/usr/bin/env bash
#
# Shows which interface would be used
# to connecto to an IP address/hostname

INPUT=$1

if [ -z $INPUT ]; then
	echo "Need an IP/hostname"
	exit
fi

if [ $(echo $INPUT | grep -c '[a-z]') -gt 0 ]; then
	INPUT=$(dig +short $INPUT | tail -1)
fi

echo -n "Interface: "
ip -o route get $INPUT | perl -nle 'if(/dev\s+(\S+)/) {print $1}'