Conect WIFI Manual

Just edit /etc/network/interfaces and write:



After that write and close file and use command:

auto wlan0
iface wlan0 inet dhcp
                wpa-ssid {ssid}
                wpa-psk  {password}

sudo dhclient wlan0


Replace {ssid} and {password} with your respective WiFi SSID and password.

Agora reinicie o servico de inteerface

Debian / Ubuntu Linux

To restart network interface, enter:

sudo /etc/init.d/networking restart

To stop and start use the following option (do not run them over remote ssh session as you will get disconnected):

sudo /etc/init.d/networking stop
sudo /etc/init.d/networking start

Redhat (RHEL) / CentOS / Fedora / Suse / OpenSuse Linux

To restart network interface, enter:

/etc/init.d/network restart

To stop and start use the following option (do not run them over remote ssh session as you will get disconnected):

/etc/init.d/network stop
/etc/init.d/network start

Slackware Linux

Type the following command:

/etc/rc.d/rc.inet1 restart

You can take down or restart particular interface such as eth1 as follows:

/etc/rc.d/rc.inet1 eth1_restart
/etc/rc.d/rc.inet1 eth1_start <-- start eth1
/etc/rc.d/rc.inet1 eth1_stop <-- stop eth1

http://www.cyberciti.biz/faq/linux-restart-network-interface/
http://unix.stackexchange.com/questions/92799/connecting-to-wifi-network-through-command-line