010-160 File Permissions and Ownership 5

Question 1

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

Accepted Answer

/etc/passwd

Answer

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

Question 2

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

Accepted Answer

Execute the script

Answer

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

Question 3

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

Accepted Answer

Sets owner to alice and group to developers

Answer

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

Question 4

Which symbolic chmod expression removes all permissions for others?

Accepted Answer

Both A and B

Answer

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

Question 5

How can you view the groups a user belongs to?

Accepted Answer

All of the above

Answer

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

(010-160) LPI Linux Essentials Practice Test