LFCS Certification Filesystem Permissions and ACLs 2

Question 1

Which command displays the ACL entries for a file named 'report.txt'?

Accepted Answer

getfacl report.txt

Answer

getfacl reads and displays the Access Control List for a specified file or directory.

Question 2

A directory has permissions 'drwxrwxrwt'. What does the 't' (sticky bit) prevent?

Accepted Answer

Users from deleting files owned by other users

Answer

The sticky bit on a directory restricts file deletion so only the file owner, directory owner, or root can remove files.

Question 3

What does the command 'setfacl -m u:alice:rx file.sh' do?

Accepted Answer

Grants alice read and execute permissions on file.sh via ACL

Answer

setfacl -m modifies (adds or updates) an ACL entry; u:alice:rx grants user alice read and execute access.

Question 4

Which octal value represents 'rwxr-x---' permissions?

Accepted Answer

750

Answer

rwx=7, r-x=5, ---=0, so the combined octal is 750.

Question 5

A file has an ACL mask of 'r--'. A group ACL entry grants 'rwx'. What effective permissions does the group have?

Accepted Answer

r--

Answer

The ACL mask limits the effective permissions of named users and groups; the effective permission is the intersection of the entry and the mask.

LFCS Certification Practice Test