performance easy Apply history-expansion 2 points

Question 43. CSCD240-E1-A

Forgot sudo on previous command. Re-run with sudo prepended without retyping.

Work the drill

Answer on paper or in a terminal before revealing the ideal answer.

Ideal answer

sudo !!

Misconception bank

Each row below is a plausible wrong answer, the thinking that produces it, and the remedy that corrects the misconception. These are the foundation of the multiple-choice framing and the targeted feedback a student receives after answering.

sudo $LAST

Misconception. Env var doesn't exist by default.

Remedy. Teach !! specifically.

sudo <up-arrow>

Misconception. Up arrow followed by Home + "sudo " works but question asks for a one-line keystroke.

Remedy. Both work; sudo !! is the single-command form.

Authority mappings

Hover any chip for the mapping justification; click to open the authority record.

DCWF roles: IT-411 Technical Support Specialist

DCWF tasks: T0295

KU outcomes: CD-BSP-O1

Course-artifact links

Lectures

CSCD240-S26-L04. Command history, man pages, help system, history file

Lab questions

CSCD240-S26-LAB2: Run several commands, then show output of history. Use !n to re-run.

CTF challenges

01 Shell & Help: Oops, Need Sudo