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May 4th, 2012 | syntax:
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[mike@bridgelinux ~]$ ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWN mode DEFAULT
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP mode DEFAULT qlen 1000
link/ether 1c:75:08:2b:56:e1 brd ff:ff:ff:ff:ff:ff
3: wlan0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DORMANT qlen 1000
link/ether 4c:0f:6e:55:de:d7 brd ff:ff:ff:ff:ff:ff
[mike@bridgelinux ~]$ ip link set wlan0 up
RTNETLINK answers: Operation not permitted
[mike@bridgelinux ~]$ sudo ip link set wlan0 up
[mike@bridgelinux ~]