RHCSA RHCSA File Permissions and ACLs 5

Question 1

Which file stores the default umask for all users logging in via a shell on a RHEL system?

Accepted Answer

/etc/profile

Answer

/etc/profile sets system-wide environment defaults including umask for login shells.

Question 2

A directory listing shows 'drwxrwt---'. What special bit is set?

Accepted Answer

Sticky bit

Answer

A lowercase 't' in the other-execute position indicates the sticky bit is set and execute is also enabled.

Question 3

User tom wants to allow user sara read and execute access to /opt/app without changing the file's group. What is the best approach?

Accepted Answer

setfacl -m u:sara:rx /opt/app

Answer

ACLs allow granting per-user permissions without modifying group ownership or broad 'other' permissions.

Question 4

What does 'setfacl -R -m u:bob:rwx /shared' do?

Accepted Answer

Recursively adds an ACL granting bob full access to all files under /shared

Answer

The -R flag makes setfacl apply the ACL modification recursively to all files and subdirectories.

Question 5

Which command would verify that an ACL is effectively limiting group 'interns' to read-only despite a broader ACL entry?

Accepted Answer

getfacl file and check the effective: comment next to the group entry

Answer

getfacl displays 'effective:' annotations showing the ACL mask's impact on each entry's actual permissions.

RHCSA Exam Practice Test