Change nameserver entries in resolve.conf

 We can directly change the contents of the file but they dont seem to be in effect. So I added Google's nameserver in the file as follows : 

$ sudo cat /etc/resolvconf/resolv.conf.d/base 

nameserver 8.8.8.8

nameserver 8.8.4.4

And then updated the file as follows : 

$ sudo resolvconf -u 

we can also just update /etc/resolve.conf and it will be in effect immediately.

$ sudo sed -i '1 i\nameserver 8.8.8.8\nnameserver 8.8.4.4' /etc/resolv.conf 

To remove the changes :

$ sudo sed -i '1,2d' /etc/resolv.conf