Checking sudoers syntax | LinuC Level 1 102 Exam original practice question

1.10.1Basic

Validate the default sudoers file and included files without changing the configuration.

Which command is appropriate?

Hint 1: Focus on the requirement

Separate the scope and side effects of the concepts before comparing the choices.

Hint 2: Key terms

Review the short definitions of the command, configuration, and security concepts involved.

visudo: A command for editing sudoers with syntax and locking safeguards.
sudoers syntax: The grammar for specifying subjects, targets, and commands in sudoers.
include file: A configuration file loaded in addition to the main sudoers file.
visudo -c: A selector that checks the syntax of sudoers and included files only.
read-only view: A display operation that does not edit or validate the configuration.

Detailed explanation

Incorrectsudo -c

Incorrect. sudo -c is not the sudoers syntax-check option.

Incorrectcat /etc/sudoers

Incorrect. cat only prints contents.

Incorrectsudo -l

Incorrect. sudo -l lists policy for a user.

Correctvisudo -c

Correct. visudo -c validates sudoers syntax.

An example you can run in a temporary verification environment.

visudo -h 2>&1 | grep -E -- '-c|--check' | head -n 1

-cまたは--checkの説明行

Foundation review

A mode bit controlling read, write, execute, or special execution behavior.

Attributes that determine whether a password or login account can be used.

A per-process or per-user ceiling such as open files or process count.

Question IDKL-102-1130

Environmentsudo visudo help / sudoers読取・変更なし

Last technical review2026-08-13

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