Linux Operating System Quiz

What is the core component of the Linux operating system that manages hardware, memory, and device interactions?

• Shell

• Kernel

• File System

• Package Manager

Answer explanation

The core component of the Linux operating system is the Kernel. It manages hardware resources, memory allocation, and device interactions, serving as a bridge between applications and the physical hardware.

Explain the difference between absolute and relative paths in a Linux file system. Why is an absolute path always unique?

• Absolute paths are shorter than relative paths.

• Absolute paths start from the root directory, making them unique.

• Relative paths are always unique.

• Relative paths start from the root directory.

Answer explanation

Absolute paths start from the root directory (/) and provide a complete path to a file or directory, ensuring uniqueness. In contrast, relative paths depend on the current working directory and may not be unique.

What is the role of systemd in CentOS 7, and how does it differ from previous service managers?

• It is a file manager.

• It is a package manager.

• It is a system and service manager, replacing older init systems.

• It is a text editor.

Answer explanation

Systemd is a system and service manager in CentOS 7 that replaces older init systems like SysVinit. It provides better management of services, parallel startup, and improved logging, making it more efficient than previous service managers.

Which command would you use to restart the Samba service when managing services with systemd?

• systemctl restart samba

• service samba restart

• restart samba

• init samba restart

Answer explanation

The correct command to restart the Samba service using systemd is 'systemctl restart samba'. The other options either use outdated commands or incorrect syntax for managing services in systemd.

Describe the purpose of the following commands: head, tail, less, and cat. How do they differ in handling text files?

• They all delete text files.

• They all edit text files.

• They display text files, but differ in the amount and method of display.

• They all create text files.

Answer explanation

The correct choice highlights that head, tail, less, and cat are commands used to display text files. They differ in how much of the file they show (e.g., head shows the beginning, tail shows the end) and their display methods.

Which command is used for viewing the contents of a file in Linux?

• chmod

• cat

• chown

• ps

Answer explanation

The command 'cat' is used in Linux to view the contents of a file. It displays the file's content in the terminal. The other options, like 'chmod' and 'chown', are used for changing file permissions and ownership, respectively.

Which command is used to change file permissions in Linux?

• ls -l

• chgrp

• chmod

• nano

Answer explanation

The command 'chmod' is used to change file permissions in Linux. The other options serve different purposes: 'ls -l' lists files, 'chgrp' changes group ownership, and 'nano' is a text editor.

Which command is used to monitor system processes in Linux?

• top

• find

• apt

• useradd

Answer explanation

The 'top' command is used in Linux to monitor system processes in real-time, displaying CPU and memory usage. The other options, 'find', 'apt', and 'useradd', serve different purposes and do not monitor processes.

Which command is used to add a new user in Linux?

• passwd

• groupadd

• useradd

• whoami

Answer explanation

The command 'useradd' is used to create a new user in Linux. 'passwd' changes a user's password, 'groupadd' creates a new group, and 'whoami' displays the current user. Therefore, 'useradd' is the correct choice.

Which command is used for network diagnostics in Linux?

• ping

• yum

• vi

• tail

Answer explanation

The 'ping' command is used in Linux for network diagnostics, allowing users to test the reachability of a host on an IP network. The other options, 'yum', 'vi', and 'tail', serve different purposes unrelated to network diagnostics.