Passwordless sudo

When executing commands as another user, then sudo is your friend.
Of course, one needs to authenticate correctly. But in day-to-day work it is tedious having to provide the password all the time.
The sudo-command can be made “passwordless” by using a tool called visudo.
Just type
sudo visudo
and your favourite editor will open.
Add the following line at the very bottom (important!)
username ALL=(ALL) NOPASSWD:ALL
That allows the user with name to execute commands as root-user.