Which of the following is causing the error message?

A Linux administrator is trying to remove the ACL from the file /home/user/data. txt but receives the following error message:

Given the following analysis:

Which of the following is causing the error message?
A . The administrator is not using a highly privileged account.
B . The filesystem is mounted with the wrong options.
C . SELinux file context is denying the ACL changes.
D . File attributes are preventing file modification.

View Answer

Answer: D

Explanation:

File attributes are preventing file modification, which is causing the error message. The output of lsattr /home/user/data.txt shows that the file has the immutable attribute (i) set, which means that the file cannot be changed, deleted, or renamed. The command setfacl -b /home/user/data.txt tries to remove the ACL from the file, but fails because of the immutable attribute. The administrator needs to remove the immutable attribute first by using the command chattr -i /home/user/data.txt and then try to remove the ACL again. The other options are incorrect because they are not supported by the outputs. The administrator is using a highly privileged account, as shown by the # prompt. The filesystem is mounted with the correct options, as shown by the output of mount | grep /home. SELinux file context is not denying the ACL changes, as shown by the output of ls -Z /home/user/data.txt.

References: CompTIA Linux+ (XK0-005) Certification Study Guide, Chapter 11: Managing Files and Directories, pages 357-358.