Running the next command only on success | LinuC Level 1 101 Exam original practice question

1.03.1Basic

Run cd build only if mkdir build succeeds.

Do not run cd when mkdir fails.

Which one-line command is appropriate?

Hint 1: Focus on the requirement

The second command is valid only when the first command succeeds.

Hint 2: Key terms

Review the short shell and command-line definitions before comparing the choices.

Short-circuit evaluation: Skipping a right-hand command once a conditional result is known.
AND operator: Runs the right side only when the left side succeeds.
Pipeline: Connects one command's standard output to another command's standard input.
Command list: A sequence of commands joined by shell control operators.

Detailed explanation

Incorrectmkdir build ; cd build

Incorrect. A semicolon runs cd even if mkdir fails.

Correctmkdir build && cd build

Correct. mkdir build && cd build conditions cd on successful creation.

Incorrectmkdir build || cd build

Incorrect. || runs the right side on failure.

Incorrectmkdir build | cd build

Incorrect. A pipe connects output and input rather than testing success.

An example you can run in a temporary verification environment.

tmp=$(mktemp -d); cd "$tmp"; mkdir build && cd build; pwd; cd /; rm -rf "$tmp"

末尾が/buildの一時パス

Foundation review

The AND operator protects a dependent step from running after a failed prerequisite.

Make the first command fail intentionally and confirm that the dependent command is skipped.

Question IDKL-101-431

EnvironmentBash 5.x / 一時ディレクトリ

Last technical review2026-08-13

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