sudo (originally standing for "super user do", now standing for "substitute user, do") is a command for Unix-like operating systems (like MacOS or Linux) that enables user privilages of another user, most commonly used to access the administrator account (also known as the super user).
The word "The" doesn't mean it occurs mostly in the "T" section; rather, it is excluded so that the next word after the word "The" (e.g.: "The Alchemist's Nightmare") will occur in that specific letter (e.g: "A").