Practice Test Geeks(010-160) LPI Linux Essentials Practice Test
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File Permissions and Ownership Flashcards

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  1. Which file stores the mapping between usernames and UIDs on a Linux system?

    Answer: /etc/passwd

    /etc/passwd contains user account information including username-to-UID mappings.

  2. A script has permissions -rwxr-xr-x. A user in the file's group runs it. What can they do?

    Answer: Execute the script

    The group permissions are r-x, which includes execute, so group members can run the script.

  3. What does 'chown alice:developers report.txt' accomplish?

    Answer: Sets owner to alice and group to developers

    The user:group syntax in chown sets both the owner (alice) and the group (developers) simultaneously.

  4. Which symbolic chmod expression removes all permissions for others?

    Answer: Both A and B

    Both 'o=' (assign nothing) and 'o-rwx' (remove all) result in no permissions for others.

  5. How can you view the groups a user belongs to?

    Answer: All of the above

    All three commands can show group membership: 'groups', 'id', and inspecting /etc/group all work.

  6. A directory has permissions drwx------. What can a non-owner, non-root user do with it?

    Answer: Nothing — they cannot read, write, or enter it

    With no permissions for group or others (------), non-owners have no access to the directory at all.

  7. What is the purpose of the /etc/group file?

    Answer: Maps group names to GIDs and lists group members

    /etc/group maps group names to GIDs and lists the supplementary members of each group.