for interface in /sys/class/net/eth* /sys/class/net/ath* /sys/class/net/wlan*; do
[ -e $interface ] || continue
i="$(basename $interface)"
for interface in /sys/class/net/eth* /sys/class/net/ath* /sys/class/net/wlan*; do
[ -e $interface ] || continue
i="$(basename $interface)"