CompTIA Linux+ Practice Questions: Permissions

8 free, exam-style CompTIA Linux+ (XK0-006) practice questions covering Permissions. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.

🚀 Take the full CompTIA Linux+ quiz 📘 CompTIA Linux+ study guide

Q1. Which permission allows executing a script?

A.Read (4)
B.Write (2)
C.Execute (1)✓ Correct
D.Sticky bit (1000)

Explanation: Execute permission (x) is required to run scripts. Learn more.

Q2. What does 'umask 027' set for new files?

A.640 (rw-r-----)✓ Correct
B.750 (rwxr-x---)
C.740 (rwxr-----)
D.644 (rw-r--r--)

Explanation: 027 umask subtracts permissions: 666-027=640 for files. Learn more.

Q3. Which command changes file ownership?

A.chmod
B.chown✓ Correct
C.chgrp
D.chattr

Explanation: chown modifies user/group ownership of files. Learn more.

Q4. What is the purpose of the 'sticky bit'?

A.Prevent file deletion by non-owners✓ Correct
B.Enable SUID execution
C.Encrypt file contents
D.Track file changes

Explanation: Sticky bit (t) on directories restricts file deletion to owners. Learn more.

Q5. Which file defines default umask for login shells?

A./etc/profile
B./etc/bashrc
C./etc/login.defs✓ Correct
D./etc/environment

Explanation: UMASK in /etc/login.defs sets default permissions. Learn more.

Q6. Which permission mode gives the owner read, write, and execute while group and others get read and execute?

A.755✓ Correct
B.644
C.600
D.700

Explanation: 755 maps to rwx for owner and r-x for group and others. Learn more.

Q7. Which command displays ACLs on a file?

A.getfacl✓ Correct
B.setenforce
C.mkfs
D.systemctl

Explanation: getfacl displays access control lists for files and directories. Learn more.

Q8. Which command grants user analyst read and write ACL permissions on report.txt without changing the file owner?

A.chmod u=analyst:rw report.txt
B.setfacl -m u:analyst:rw report.txt✓ Correct
C.chown analyst:rw report.txt
D.usermod -a report.txt analyst

Explanation: setfacl modifies the file access control list and can grant a named user permissions independently of the traditional owner, group, and other bits. Learn more.