XK0-006 System Management Practice Question
A Linux administrator needs to change the permissions of a file to allow the owner to read and write, the group to read only, and others to have no access. Which chmod command should be used?
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
✓
chmod 640 file
The symbolic representation rw-r----- corresponds to octal 640. rw- = 4+2+0=6, r-- = 4+0+0=4, --- = 0+0+0=0.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✓
chmod 640 file
Why this is correct
Correct: 640 sets rw-r-----.
- ✗
chmod 600 file
Why it's wrong here
600 sets rw-------, which gives no access to group or others.
- ✗
chmod 755 file
Why it's wrong here
755 sets rwxr-xr-x, which gives execute to owner and read/execute to group and others.
- ✗
chmod 644 file
Why it's wrong here
644 sets rw-r--r--, which gives read to others.
Go deeper
Related to this question
Learn chapter
Linux Fundamentals and History
Key term
Linux
Linux is an open-source operating system that manages computer hardware and software, widely used in servers, desktops, and embedded systems.
Key term
chmod
chmod is a command in Linux and Unix-like operating systems used to change the permissions (read, write, execute) of a file or directory.
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JA
Written by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
This XK0-006 practice question is part of Courseiva's free CompTIA 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 XK0-006 exam.