Auto Connect wifi script for linux

There are multiple USB wifi cards connected to a single laptop (via powered hub) Card 0 is reserved for ad hoc connections and is already working fine The rest of the cards need to scan area frequently and connect to wifi networks found There will be a file in which I can list the preferred networks with their key. (wep/wpa etc) Every X minutes system will scan surrounding area If some preferred network is found then connect to them using available cards. cards and preferred network must be read top down for priority. So if 5 cards are available and 3 preferred networks are found then card 1 will connect to first preferred network, card 2 to second etc. After all preferred network have been connected to and connection works, ie can reach 8.8.8.8 connect to open networks with strongest network as highest priority. DO ONE NEW CONNECTION EVERY X MINUTES When a connected network is no longer in sight or can not reach 8.8.8.8. make the wifi card available. Connect to new networks when seen. every time a new network is connected to. Make that the default route. Ensure that 1 network is connected to 1 wifi card max. Do NOT move connection from 1 wifi card to another card just because signal strength has changed. when i plug in the usb devices at this time i get tail /var/log/messages Jul 3 04:54:07 Ecuador2 kernel: rtl8192cu: Board Type 0 Jul 3 04:54:07 Ecuador2 [login to view URL][2891]: Cannot find firmware file 'rtlwifi/[login to view URL]' Jul 3 04:54:07 Ecuador2 kernel: usbcore: registered new interface driver usbserial Jul 3 04:54:07 Ecuador2 kernel: USB Serial support registered for generic Jul 3 04:54:07 Ecuador2 kernel: usbcore: registered new interface driver usbserial_generic Jul 3 04:54:07 Ecuador2 kernel: usbserial: USB Serial Driver core Jul 3 04:54:07 Ecuador2 kernel: USB Serial support registered for GSM modem (1-port) Jul 3 04:54:07 Ecuador2 kernel: usbcore: registered new interface driver option Jul 3 04:54:07 Ecuador2 kernel: option: v0.7.2:USB Driver for GSM modems Jul 3 04:54:07 Ecuador2 logger: usb_modeswitch: adding device ID bda/8176/200: to driver "option"