Nice one-liner to remove sudo prompts for the current user
```
sudo bash -c 'echo "$(logname) ALL=(ALL:ALL) NOPASSWD: ALL" | (EDITOR="tee -a" visudo)'
```
I think you could just do:
```
echo "$USER ALL=(ALL:ALL) NOPASSWD: ALL" | sudo env EDITOR="tee -a"
```
visudo, only visudo needs sudo after all (and even env won't be needed in the default configuration, IIRC). – muru Jun 27 '16 at 20:38