XK0-006 System Management Practice Question
Given an ACL entry 'u:john:rwx' on a file, which command would remove only the ACL entry for user john without affecting other ACL entries?
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
setfacl -x u:john /path/to/file
setfacl -x removes a specific ACL entry. The syntax 'u:john' removes the ACL for user john.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
setfacl -k /path/to/file
Why it's wrong here
-k removes default ACL entries.
- ✗
setfacl -m u:john:- /path/to/file
Why it's wrong here
-m modifies, not removes; setting no permissions is not the same as removing the entry.
- ✓
setfacl -x u:john /path/to/file
Why this is correct
-x removes the specified entry.
- ✗
setfacl -b /path/to/file
Why it's wrong here
-b removes all ACL entries.
Visual reference
Go deeper
Related to this question
Learn chapter
File Permissions and Ownership
Key term
setfacl
setfacl is a Linux/Unix command used to set Access Control Lists on files and directories, providing more detailed permission control beyond the standard owner-group-others model.
Key term
ACL
An Access Control List is a set of rules that determines who or what can access specific network resources or data.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
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