LFCS Essential Commands Practice Question
A user reports that they cannot delete a file named 'important.txt' located in their home directory. The file is owned by the user and the user has write permission on the directory. Running 'rm important.txt' produces the error: 'rm: cannot remove 'important.txt': Operation not permitted'. The user has also tried using 'sudo rm' but gets the same error. Which of the following is the most likely cause and correct solution?
⚠ Common exam trap
Many candidates confuse 'Operation not permitted' with standard permission errors, overlooking the immutable attribute as a filesystem-level override that affects even root and is not visible with 'ls -l'.
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
✓
The file has the immutable attribute set. Use 'lsattr important.txt' and if the 'i' attribute is present, remove it with 'chattr -i important.txt'.
The error 'Operation not permitted' despite the user owning the file and having write permission on the directory indicates a filesystem-level restriction rather than a permission or ACL issue. The immutable attribute (i) on the file prevents any modification, including deletion, even by the root user. Running 'lsattr' reveals the attribute, and 'chattr -i' removes it, allowing deletion.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
The file has an ACL that denies deletion. Use 'setfacl -b important.txt' to remove ACLs.
Why it's wrong here
ACLs do not cause 'Operation not permitted' for root.
- ✓
The file has the immutable attribute set. Use 'lsattr important.txt' and if the 'i' attribute is present, remove it with 'chattr -i important.txt'.
Why this is correct
The immutable attribute prevents deletion; removing it allows deletion.
- ✗
The file is currently in use by another process. Use 'lsof' to find the process and kill it.
Why it's wrong here
An open file causes 'device or resource busy', not 'Operation not permitted'.
- ✗
The directory has the sticky bit set, preventing deletion. Use 'chmod o-t .' to remove the sticky bit.
Why it's wrong here
The sticky bit prevents deletion of other users' files, but the user owns this file.
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Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This LFCS practice question is part of Courseiva's free Linux Foundation certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the LFCS exam.