What does the message "Unrecognized action 'sudo'" mean in MacPorts / Terminal?

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The message "Unrecognized action 'sudo'" in MacPorts / Terminal means that the command "sudo" (which stands for "Super User Do") was not recognized by the system. This could be due to a number of reasons, such as the command being misspelled, the user not having the necessary privileges to execute the command, or the command not being installed on the system. sudo is used to run commands with elevated privileges as another user, such as the root user.