multiple_choice
easy
Remember
cmd-subst
2 points
Question 6. CSCD240-E1-C
Recommended modern syntax for command substitution?
Work the drill
Answer on paper or in a terminal before revealing the ideal answer.
Ideal answer
B: $(cmd)
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.
A: `cmd`
Misconception. Backticks are legacy; harder to nest.
Remedy. $() is nestable and preferred.
C: ${cmd}
Misconception. ${} is variable expansion, not command substitution.
Remedy. Distinguish ${} vs $().
D: !cmd
Misconception. ! is history expansion.
Remedy. Different mechanism entirely.
Authority mappings
Hover any chip for the mapping justification; click to open the authority record.
DCWF roles:
SE-627 DevSecOps Specialist
DCWF tasks:
T0498
KU outcomes:
CO-M5-O2
Course-artifact links
Lectures
- CSCD240-S26-L05. Permissions part 1: ls -l anatomy, rwx, file types
Lab questions
- CSCD240-S26-LAB5: Use $(date +%F) inside a string. Also demonstrate backticks.
CTF challenges
- 04 Environment & Patterns: Capture the Output