How can I get connected to wireless in cmd line?

Question

I've a wep key，and How to connect to the wireless using cmd line ?
[nicholas@LNZJU ~]$ iwlist wlan0 scanning|more
wlan0 Scan completed :
Cell 01 - Address: 00:13:46:E8:61:48
ESSID:"PT8F2"
Protocol:IEEE 802.11g
Mode:Managed
Frequency:2.437 GHz (Channel 6)
Quality:48/100 Signal level:-65 dBm Noise level:-96 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
48 Mb/s; 54 Mb/s
Extra:bcn_int=100
Extra:atim=0
Cell 02 - Address: 00:1B:11:14:47:B6
ESSID:"PT8F6"
Protocol:IEEE 802.11g
Mode:Managed
Frequency:2.437 GHz (Channel 6)
Quality:51/100 Signal level:-63 dBm Noise level:-96 dBm
Encryption key:on
Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
12 Mb/s; 24 Mb/s; 36 Mb/s; 9 Mb/s; 18 Mb/s
48 Mb/s; 54 Mb/s
Extra:bcn_int=100
Extra:atim=0

Answer 1

I think something like this should work:
1) sudo iwconfig wlan0 essid [wireless network name]
2) sudo iwconfig wlan0 key [wepkey]
3) sudo dhcpcd wlan0
Another way is to enter the appropriate info in /etc/rc.conf [networking section] and /etc/conf.d/wireless and then you can just do "sudo /etc/rc.d/network restart".
This is all from memory so I could have messed something up...