Adding group write permission | LinuC Level 1 101 Exam original practice question

1.02.1Basic

Add only group write permission to team.conf while preserving its other existing permissions.

Which command is appropriate?

Hint 1: Focus on the requirement

Identify the subject, the operation, and the permission bit being added.

Hint 2: Key terms

Review the short definitions before comparing the ownership and permission choices.

u: The symbolic-mode selector for the file owner.
g: The symbolic-mode selector for the file's owning group.
o: The symbolic-mode selector for users other than the owner and group.
Add operator: The plus sign in chmod symbolic mode, which adds a permission.
Write permission: Permission to modify a file's contents when other conditions allow it.

Detailed explanation

Incorrectchmod u+w team.conf

Incorrect. u selects the owner.

Correctchmod g+w team.conf

Correct. chmod g+w team.conf adds group write permission.

Incorrectchmod o+w team.conf

Incorrect. o selects other users.

Incorrectchmod g-w team.conf

Incorrect. g-w removes group write permission.

An example you can run in a temporary verification environment.

tmp=$(mktemp); chmod 640 "$tmp"; chmod g+w "$tmp"; stat -c '%a' "$tmp"; rm -f "$tmp"

Environment: GNU coreutils 9.x / 一時ファイル
Use a disposable file or directory when checking chmod calculations.
Exact permission display can vary slightly with filesystem and distribution defaults.

Foundation review

A symbolic chmod expression can change one subject and one bit while preserving unrelated mode bits.

Confirm the subject selector before changing a shared file; g and o affect different audiences.

Question IDKL-101-375

EnvironmentGNU coreutils 9.x / 一時ファイル

Last technical review2026-08-13

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