FOR a certain subset of Internet users, “Sudo make me a sandwich” may as well be “Take my wife ... please.”

Perhaps some explanation is in order. Before giving up the goods, however, we should heed the warning of Randall Munroe, the 23-year-old creator of xkcd, a hugely popular online comic strip (at least among computer programmers) where the sandwich line appeared. Mr. Munroe believes that analyzing a joke is like dissecting a frog  it can be done, but the frog dies.

Still, he plays along, explaining that “sudo” is a command in the Unix operating system that temporarily grants godlike powers: “The humor comes from people who have encountered typing a command and having the computer say ‘No,’ and they say, ‘Oh, yeah, sudo says,’ and the computer does it. Kind of like ‘Simon says.’ ”

Hence the set-up: one stick figure says to another, “Make me a sandwich,” only to be told, “No.” Thinking quickly, stick figure No. 1 says, “Sudo make me a sandwich,” and the once-recalcitrant stick figure No. 2 must comply.