#!/bin/sh
IFCFGTOOL="/sbin/ifconfig"
IWCFGTOOL="iwconfig"

WANDEV="wlan0"
MODE="managed"
CHANNEL="3"
ESSID="NetworkName"
KEY="KEYKEYKEYKEYKEY"

$IFCFGTOOL $WANDEV down;
$IWCFGTOOL $WANDEV mode $MODE;
$IWCFGTOOL $WANDEV channel $CHANNEL;
$IWCFGTOOL $WANDEV essid $ESSID;
$IWCFGTOOL $WANDEV key $KEY;
$IFCFGTOOL $WANDEV up;