Switch wireless access point by CLI

This is a reference site. The section "Switching Connections" indicates how to switch wireless access point.

1. generate /etc/network/interfaces like below.
2. ifup wlan0=$DEFINED_ESSID

This is a sample of /etc/network/interfaces.

root@debian:~# cat /etc/network/interfaces 
# This file describes the network interfaces available on your system
# and how to activate them. For more information, see interfaces(5).

# The loopback network interface
auto lo
iface lo inet loopback

#auto wlan0
iface home3 inet dhcp
	wpa-ssid home-access-3
	wpa-psk 7ea88602092fa83029c9a4e6d888a6bf3a4bd12eb341efb24294c32588d04616
iface home1 inet dhcp
	wpa-ssid home-access-1
	wpa-psk 0732375e4d2d65951298238ffd8989c3ebe21ec2134fca240d2ddec96fedd320
root@debian:~#

The line "auto wlan0" should be commented out.

This is a procedure how to switch the wireless access point.

1. ifup wlan0=home3(connect to home3 access point)
2. /etc/init.d/networking restart(disconnect from home3)
3. ifup wlan0=home1(connect to home1 access point)