Q1. What is the purpose of the 'nohup' command?
- A.Prevent process termination on logout✓ Correct
- B.Monitor CPU usage
- C.Encrypt files
- D.Manage user groups
Explanation: nohup keeps processes running after terminal disconnection. Learn more.
CompTIA Linux+ Practice Questions: More Practice Questions
20 free, exam-style CompTIA Linux+ (XK0-006) practice questions covering More Practice Questions. Each question shows the correct answer and a clear explanation. Ready for the real thing? Take the full timed quiz below.
Q2. What does 'kill -9' do?
- A.Gracefully terminate process
- B.Force immediate termination✓ Correct
- C.Reload configuration
- D.Pause process
Explanation: SIGKILL (9) cannot be ignored by processes. Learn more.
Q3. Which command shows process hierarchy?
- A.pstree✓ Correct
- B.ps aux
- C.top
- D.htop
Explanation: pstree displays processes in tree format. Learn more.
Q4. Which command changes the nice value of an already running process?
- A.nice --existing
- B.nohup
- C.disown
- D.renice✓ Correct
Explanation: renice changes the scheduling priority of an existing process by updating its nice value. Learn more.
Q5. Which file defines default useradd settings?
- A./etc/login.defs
- B./etc/passwd
- C./etc/default/useradd✓ Correct
- D./etc/skel/
Explanation: /etc/default/useradd controls user creation defaults. Learn more.
Q6. What is the purpose of 'usermod -aG'?
- A.Add user to group✓ Correct
- B.Change user password
- C.Delete user account
- D.Modify UID
Explanation: -aG appends user to supplementary groups. Learn more.
Q7. Which file defines default shell?
- A./etc/passwd✓ Correct
- B./etc/shells
- C./etc/profile
- D./etc/bashrc
Explanation: Last field in /etc/passwd specifies user's shell. Learn more.
Q8. What does 'userdel -r' do?
- A.Remove user's home directory✓ Correct
- B.Reset password
- C.Reload user cache
- D.Delete group
Explanation: -r removes home dir and mail spool. Learn more.
Q9. Which file defines kernel parameters at boot?
- A./etc/sysctl.conf
- B./proc/cmdline
- C./boot/grub/grub.cfg✓ Correct
- D./etc/kernel/postinst.d
Explanation: GRUB configuration passes parameters via /boot/grub/grub.cfg. Learn more.
Q10. What does 'sysctl -w' do?
- A.Write kernel parameters temporarily✓ Correct
- B.Write to syslog
- C.Wipe system configuration
- D.Watch process changes
Explanation: Modifies kernel parameters at runtime. Learn more.
Q11. Which directory contains DKMS kernel modules?
- A./usr/src
- B./lib/modules
- C./var/lib/dkms✓ Correct
- D./etc/dkms
Explanation: DKMS stores built modules in /var/lib/dkms. Learn more.
Q12. Which directory contains modprobe configuration files?
- A./etc/modprobe.d✓ Correct
- B./lib/modules
- C./etc/sysconfig/modules
- D./proc/modules
Explanation: modprobe.d contains kernel module options. Learn more.
Q13. Which Bash construct stores the exit status of the most recent command?
- A.$?✓ Correct
- B.$HOME
- C.$PATH
- D.$SHELL
Explanation: $? expands to the exit status of the last foreground pipeline or command. Learn more.
Q14. Which Bash redirection sends both standard output and standard error to the same file?
- A.> file 2>&1✓ Correct
- B.< file 1<2
- C.| file
- D.>> /dev/null <&0 only
Explanation: 2>&1 redirects standard error to the same destination as standard output. Learn more.
Q15. Which tool performs static analysis on shell scripts and reports common quoting, portability, and logic problems?
- A.strace
- B.ShellCheck✓ Correct
- C.ldd
- D.logrotate
Explanation: ShellCheck analyzes shell scripts without executing them and reports common errors, risky expansions, and portability concerns. Learn more.
Q16. What does 'grep -i' do?
- A.Invert match
- B.Case-insensitive search✓ Correct
- C.Show line numbers
- D.Recursive search
Explanation: -i makes the search case-insensitive. Learn more.
Q17. What does 'grep -v' do?
- A.Invert match✓ Correct
- B.Verbose output
- C.Show version
- D.Recursive search
Explanation: -v selects non-matching lines. Learn more.
Q18. Which Git command stages all modified files?
- A.git add .✓ Correct
- B.git commit
- C.git push
- D.git stage
Explanation: git add . stages current directory changes. Learn more.
Q19. Which directory holds Apache virtual host configurations?
- A./etc/httpd/conf.d/
- B./var/www/html
- C./usr/lib/apache2
- D./etc/apache2/sites-available/✓ Correct
Explanation: Debian-based systems use sites-available/ and sites-enabled/. Learn more.
Q20. Which directory contains cloud-init configurations?
- A./etc/cloud
- B./var/lib/cloud
- C./usr/share/cloud-init
- D.All of the above✓ Correct
Explanation: Cloud-init uses multiple directories for initialization. Learn more.