visudo is an essential utility in Linux used for editing the sudoers configuration file. This file controls the permissions for users who can execute commands with administrative privileges. Visudo ensures that there are no syntax errors that could lock you out of administrative commands by automatically validating the file before saving it.

Instead of editing the sudoers file directly with a regular text editor, visudo opens the file in a safe editor and warns you of any syntax mistakes before applying changes. This protects your system from errors that could compromise it. If you're interested in learning how to change the default editor used by visudo on Ubuntu and Debian, I recommend reading this article on changing the visudo editor.

For more helpful information on managing your system, visit idolinux.com, where you'll find detailed articles on various commands and techniques for Linux.