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XK0-006 Valid Test Bootcamp & Certificate XK0-006 Exam
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CompTIA Linux+ Certification Exam Sample Questions (Q19-Q24):NEW QUESTION # 19
A Linux administrator wants to add a user to the Docker group without changing the user's primary group.
Which of the following commands should the administrator use to complete this task?
- A. sudo groupmod -G docker user
- B. sudo usermod -aG docker user
- C. sudo groupmod docker user
- D. sudo usermod -g docker user
Answer: B
Explanation:
User and group management is a core System Management topic in CompTIA Linux+ V8. When adding a user to an additional group-such as the docker group-care must be taken not to alter the user's primary group.
The correct command is sudo usermod -aG docker user. The -G option specifies a supplementary group, and the -a (append) option ensures the user is added to the group without removing existing group memberships. This is especially important because omitting -a would overwrite the user's supplementary groups.
Option B, usermod -g docker user, changes the user's primary group, which is not desired. Options A and D misuse groupmod, which is intended for modifying group properties, not user membership.
Linux+ V8 documentation explicitly warns that failing to use -a with -G can unintentionally remove a user from all other supplementary groups, potentially causing access issues.
Therefore, the correct and safe command is C. sudo usermod -aG docker user.
NEW QUESTION # 20
An administrator wants to search a file named myFile and look for all occurrences of strings containing at least five characters, where characters two and five are i, but character three is not b. Which of the following commands should the administrator execute to get the intended result?
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