Sudo is a shell command used on Unix-like operating systems. It allows a user to execute programs with the security privileges of another user, which is typically the superuser by default.
Originally standing for "superuser do," the command's meaning has evolved as its functionality expanded. While it remains commonly used for superuser actions, the official Sudo project page lists it as "su 'do'." In modern Linux manual pages, where "su" stands for "substitute user," the current interpretation of sudo is defined as "substitute user, do."