How do I setup Wifi using the command line?

I need to setup as following, but its failed:

Target:

Security: WEP

Network name: wifi59/7

Key/password: xyz

Tried and failed:

sudo iwconfig wlan0 mode managed

sudo iwconfig wlan0 channel 11

sudo iwconfig wlan0 essid wifi59/7

sudo iwconfig wlan0 key xyz

Error for wireless request "Set Encode" (8B2A) :

    SET failed on device wlan0 ; Invalid argument.