#!/bin/sh

list() {
    local dev=$1
    if [ -n "$dev" ]; then
	arg="dev $dev"
    fi
    ip route list $arg 2>/dev/null \
    | awk '$1 == "default" {
    dev = "'$dev'"
    metric = "0"
    for (i = 1; i <= NF; i++) {
        if ($i == "metric") { metric = $(i+1) }
        if ($i == "dev") { dev = $(i+1) }
    }
    if (dev) { print dev " " metric }
    }'
}

list_all() {
    if [ -z "$*" ]; then
	list
    else
	for intf in $*; do
	    RES=$(list $intf)
	    echo ${RES:-$intf 2147483647}
	done
    fi
}

list_all $* | sort -nk 2 | awk '{ print $1 }'