BYU-ITC-515R-ACT

Homework 2 – OS Structure

1. Question: What is the default file system used by Ubuntu?
   • Answer: ext4
2. Question: Which file system is the default for both CentOS and Rocky Linux?
   • Answer: xfs
3. Question: Which directory is used for storing logs and variable data in most distributions?
   • Answer: /var
4. Question: Which command is used to update software packages in CentOS and Rocky Linux? Assume you are logged in as root.
   • Answer: dnf update or yum update
5. Question: Which command is primarily used to manage software packages in Ubuntu?
   • Answer: apt
6. Question: Which command is used to update software packages in Ubuntu? Assume you are logged in as root.
   • Answer: apt update
7. Question: In which directory are user-installed software and libraries typically stored in Ubuntu?
   • Answer: /usr
8. Question: What system and service manager is used by all three distributions: Ubuntu, CentOS, and Rocky Linux?
   • Answer: systemd
9. Question: Which package manager is used by both CentOS and Rocky Linux?
   • Answer: dnf or yum
10. Question: Which directory is used to store system-wide configuration files across Ubuntu, CentOS, and Rocky Linux?
    • Answer: /etc
11. Question: What is the common command to view running processes?
    • Answer: ps
12. Question: Where are boot loader files, kernel images, and initial RAM disk files stored in Ubuntu, CentOS, and Rocky Linux?
    • Answer: /boot
13. Question: In which directory are user-specific data files stored in Ubuntu, CentOS, and Rocky Linux?
    • Answer: /home
14. Question: Which distribution supports both deb and snap packages?
    • Answer: Ubuntu
15. Question: In which directory are the systemd unit files located across Ubuntu, CentOS, and Rocky Linux?
    • Answer: /etc/systemd/system
16. Question: Which distribution would use the dpkg command for package management tasks?
    • Answer: Ubuntu
17. Question: What command would you use to check the status of the sshd service using systemd? Assume you are logged in as root.
    • Answer: systemctl status sshd or systemctl status ssh
18. Question: Where are the systemd unit files stored in the system?
    • Answer: /etc/systemd/system
19. Question: How would you reload the systemd configuration files after making changes? Assume you are logged in as root.
    • Answer: systemctl daemon-reload
20. Question: What command is used to edit the cron jobs for the current user in Ubuntu?
    • Answer: crontab -e
21. Question: Where are system-wide cron jobs typically stored?
    • Answer: /etc/crontab or /etc/cron.d/
22. Question: Which command lists all cron jobs for the current user?
    • Answer: crontab -l
23. Question: What file stores user account information, including usernames and UIDs?
    • Answer: /etc/passwd
24. Question: Where are the user passwords stored in a hashed format in Linux?
    • Answer: /etc/shadow
25. Question: How can you list all the users currently logged into the system?
    • Answer: who or w
26. Question: How do you display the current user’s username in the terminal?
    • Answer: whoami
27. Question: Which command can be used to restart a service using systemd? You do not need to include a service name. Assume you are logged in as root.
    • Answer: systemctl restart
28. Question: Which command would you use to disable a service from starting at boot with systemd? You do not need to include a service name. Assume you are logged in as root.
    • Answer: systemctl disable
29. Question: Which command would you use to view a user’s last login time?
    • Answer: last
30. Question: Which file in Ubuntu is used to list the software repositories?
    • Answer: /etc/apt/sources.list
31. Question: Which command lists all the repositories enabled on a CentOS or Rocky Linux system? Assume you are logged in as root.
    • Answer: dnf repolist or yum repolist
32. Question: How do you clean the local package cache to free up space in Ubuntu? Assume you are logged in as root.
    • Answer: apt clean or apt autoremove
33. Question: What is the command to list all installed packages and their versions in CentOS or Rocky Linux? Assume you are logged in as root.
    • Answer: dnf list installed or yum list installed
34. Question: The sudo group in Ubuntu is as to the _____ group in Centos
    • Answer: wheel