wireless/wired with failover

wifi.awk

#!/usr/bin/awk -f
function run(cmd) {
        if (system(cmd) != 0)
                exit 1
}

BEGIN {
        networks["my-super-network"] = "u1tr@SecURep@ssw0rd111"
        iface = "wpi0"
        wired = "em0"

        printf("Network to connect:\n")
        for (n in networks) {
                printf(" %d.%s\n", i++, n)
        }
        getline reply
        i = 0
        for (n in networks) {
                if (reply == i++)
                        break
        }
        run(sprintf("sudo ifconfig %s nwid \"%s\" wpakey \"%s\"", iface, n, networks[n]))
        run(sprintf("sudo ifconfig %s up", wired))
        run(sprintf("sudo ifconfig %s up", iface))
        run(sprintf("sudo ifconfig trunk0 destroy"))
        run(sprintf("sudo ifconfig trunk0 trunkport %s trunkport %s trunkproto failover", wired, iface))
        run(sprintf("sudo dhclient trunk0", iface))
}