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#!/bin/sh if [ `id -u` -ne 0 ] || [ "$1" = "" ]; then exit 1; fi if [ -x /usr/bin/fping ]; then PING="/usr/bin/fping" else PING="/bin/ping -c 2" fi iface="$1" which="" while read addr pingme scheme; do if [ "$which" ]; then continue; fi #echo " Trying $addr & $pingme ($scheme)" >&2 ip addr add $addr dev $iface >/dev/null 2>&1 ip link set $iface up >/dev/null 2>&1 if $PING $pingme >/dev/null 2>&1; then which="$scheme" fi ip link set $iface down >/dev/null 2>&1 ip addr del $addr dev $iface >/dev/null 2>&1 done if [ "$which" ]; then echo $which; exit 0; fi exit 1