RB_CONFIG="$(grep "RedBoot config" /proc/mtd | cut -d: -f1)" for npe in eth0 eth1 eth2 do if [ "$(ifconfig $npe 2>/dev/null | grep -c 00:00:00:00:00:00)" == "1" ]; then ifconfig $npe hw ether $(fconfig -s -r -d /dev/$RB_CONFIG -n npe_"$npe"_esa) fi done