Make sudo stop asking for a password

If you want ubuntu or your linux machine  to stop asking for the sudo password every time you issue a command with sudo

sudo sh -c "echo 'ALL ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers"
 
Or a little safer, where feature is only for user

sudo sh -c "echo '$USER ALL=(ALL) NOPASSWD:ALL' >> /etc/sudoers"

PS: This is best suited for a personal machine and not on a server.