When a command is run with sudo as the prefix, then it'll execute it with superuser privileges. By default, running a command with sudo doesn't need a password, but this can cost dearly if a hacker gets access to Raspberry Pi and takes control of everything. To make sure that a password is required every time a command is run with superuser privileges, edit the 010_pi-nopasswd file under /etc/sudoers.d/ by executing the command shown in Figure 10.8:
Figure 10.8
This command will open up the file in the nano editor; replace the content with pi ALL=(ALL) PASSWD: ALL, and save it.
Updated Raspbain operating system
To get the latest security updates, it is important to ensure that the Raspbian OS is updated with the latest version whenever available. Visit https://www.raspberrypi.org/documentation/raspbian/updating.md to learn the steps to update Raspbain.