Linux Shell Scripting Cookbook - Third Edition

How to do it...

This script will connect to a wireless LAN with WEP (Wired Equivalent Privacy):

#!/bin/bash 
#Filename: wlan_connect.sh 
#Description: Connect to Wireless LAN 

#Modify the parameters below according to your settings 
######### PARAMETERS ########### 
IFACE=wlan0 
IP_ADDR=192.168.1.5 
SUBNET_MASK=255.255.255.0 
GW=192.168.1.1 
HW_ADDR='00:1c:bf:87:25:d2'  
#Comment above line if you don't want to spoof mac address 

ESSID="homenet" 
WEP_KEY=8b140b20e7  
FREQ=2.462G 
################################# 

KEY_PART="" 

if [[ -n $WEP_KEY ]]; 
then 
  KEY_PART="key $WEP_KEY" 
fi 

if [ $UID -ne 0 ]; 
then 
  echo "Run as root" 
  exit 1; 
fi 

# Shut down the interface before setting new config 
/sbin/ifconfig $IFACE down 


if [[ -n $HW_ADDR ...