Ubuntu Tricks?

There are lots of tricks or tips when I use Linux. Most of time I use Ubuntu. Here, I want to record some experiences during my work on Ubuntu.

NO password when sudo

It's not safe for a normal user to do root's matters. As result, there is sudo. But in some cases, the password is not necessary. For example, using ansible. We can cancel the verification by doing this:

$ pkexec visudo

# change the %sudo line into following:

then exit and enjoy no password for sudo xxx.