$ sudo sh todo/ethcheck.sh 
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: wmaster0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ieee802.11 00:19:d2:96:9a:5d brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:19:d2:96:9a:5d brd ff:ff:ff:ff:ff:ff
4: irda0: <NOARP> mtu 2048 qdisc noop state DOWN qlen 8
    link/irda 00:00:00:00 brd ff:ff:ff:ff
5: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:16:41:e5:3a:0c brd ff:ff:ff:ff:ff:ff
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: wmaster0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ieee802.11 00:19:d2:96:9a:5d brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:19:d2:96:9a:5d brd ff:ff:ff:ff:ff:ff
4: irda0: <NOARP> mtu 2048 qdisc noop state DOWN qlen 8
    link/irda 00:00:00:00 brd ff:ff:ff:ff
5: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:16:41:e5:3a:0c brd ff:ff:ff:ff:ff:ff
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN 
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: wmaster0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ieee802.11 00:19:d2:96:9a:5d brd ff:ff:ff:ff:ff:ff
3: wlan0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:19:d2:96:9a:5d brd ff:ff:ff:ff:ff:ff
4: irda0: <NOARP> mtu 2048 qdisc noop state DOWN qlen 8
    link/irda 00:00:00:00 brd ff:ff:ff:ff
5: eth0: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN qlen 1000
    link/ether 00:16:41:e5:3a:0c brd ff:ff:ff:ff:ff:ff