Wifi setup from command line on linux

 1. find the wireless interface (starting with w)

ip a

2. To check the configuration of the wireless interface

sudo iwconfig

2. make sure the wireless interface is up

sudo ip link set w___ up

3. find the ESSID of available for connection

sudo iwlist w___ scan | grep ESSID

4.1 Connect to the ESSID of your choice ( yyy )

sudo iwconfig w___ essid yyy

4.2 If it's password-protected then use

sudo iwconfig w___ essid yyy key s:zzz

(Here "s:" is used for string, while "zzz" is your key)

5. Setting up dhcp

sudo dhclient w___

6. check the connection to the internet

ping 8.8.8.8