Una de las novedades de Fedora 13 es la mejora de NetworkManager en la terminal. Ahora es sumamente sencillo conectarse por wifi desde la consola.
Para esto necesitamos el paquete cnetworkmanager, lo instalamos si no lo tenemos:

$ su -c 'yum install cnetworkmanager'

para ver la lista de ESSIDs disponibles, ejecutamos

$ cnetworkmanager -a
Active | HwAddress         | Ssid
-------+-------------------+--------
       | 00:21:29:96:86:5C | linksys
       | 00:1C:10:8D:09:EB | Nibbler
       | 00:1B:11:D1:E9:75 | red

en este ejemplo me voy a conectar a mi red que es Nibbler, para esto ejecuto:

$ cnetworkmanager --connect=Nibbler --wpa-pass=

para más información sobre cómo usar cnetworkmanager les dejo la ayuda:

$ cnetworkmanager -h
Usage: cnetworkmanager [options]

Options:
  --version             show program's version number and exit
  -h, --help            show this help message and exit
  -t, --terse           No table headings and padding, suitable for parsing
  -w BOOL, --wifi=BOOL  Enable or disable wireless
  -o BOOL, --online=BOOL
                        Enable or disable network at all
  --state               Print the NM state
  --we, --wireless-enabled
                        Print whether the WiFi is enabled
  --whe, --wireless-hardware-enabled
                        Print whether the WiFi hardware is enabled
  -d, --device-list, --dev
                        List devices
  --device-info=DEV, --di=DEV
                        Info about device DEV (by interface or UDI(TODO))
  -a, -n, --ap-list, --ap, --nets
                        List access points
  --ap-info=AP, --ai=AP
                        Info about access point AP (by hw address or
                        UDI(TODO))
  -u, --usrcon          List user connection settings
  -s, --syscon          List system connection settings
  --con-info=[KIND,]ID, --ci=[KIND,]ID
                        Info about connection settings ID (of the
                        *user*/system KIND)
  -c, --actcon          List active connections
  --demo                Run a random demonstration of the API
  --activate-connection=[KIND],ID,[DEV],[APMAC]
                        activate the KIND(user/system) connection ID on device
                        DEV using APMAC.
  -m, --monitor         loop to show dbus signals
  -C SSID, --connect=SSID
                        Connect to a wireless network SSID (creating the
                        configuration using the key options below)
  --unprotected         network does not require a key
  --wep-hex=KEY         use this WEP key of 26 hex digits
  --wep-pass=KEY        use this WEP passphrase
  --wpa-psk-hex=KEY     use this WPA key of 64 hex digits
  --wpa-pass=KEY        use this WPA passphrase