Linux distributions overview (Ubuntu, CentOS, Fedora) in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

Identify the package manager output

You run the command sudo apt update on a Linux system. Which distribution are you most likely using?

A CentOS

B Ubuntu

C Fedora

D Arch Linux

💡 Hint

Think about which distributions use apt as their package manager.

Ubuntu uses the apt package manager. CentOS and Fedora use yum or dnf. Arch Linux uses pacman.

💻 Command Output

intermediate

Determine the output of a release info command

What is the expected output of the command cat /etc/centos-release on a CentOS system?

A CentOS Linux release 7.9.2009 (Core)

B Ubuntu 20.04.4 LTS

C Fedora release 38 (Thirty Eight)

D Debian GNU/Linux 11 (bullseye)

💡 Hint

This file contains the distribution name and version for CentOS.

The file /etc/centos-release contains the CentOS version string like CentOS Linux release 7.9.2009 (Core).

📝 Syntax

advanced

Correct command to install a package on Fedora

Which command correctly installs the package htop on Fedora?

A sudo dnf install htop

B sudo apt install htop

C sudo yum install htop

D sudo pacman -S htop

💡 Hint

Fedora uses a modern package manager replacing yum.

Fedora uses dnf as its package manager. While yum may still work, dnf is the recommended tool.

🚀 Application

advanced

Choose the correct command to check the kernel version on Ubuntu

You want to check the Linux kernel version on an Ubuntu system. Which command will give you the correct output?

A apt-get kernel-version

B cat /etc/fedora-release

C uname -r

D rpm -q kernel

💡 Hint

The kernel version is shown by a system command, not a package manager.

The command uname -r prints the kernel version on any Linux system including Ubuntu.

🧠 Conceptual

expert

Identify the main difference between CentOS and Fedora

What is the primary difference between CentOS and Fedora in terms of their release and support model?

A CentOS is based on Debian; Fedora is based on Arch Linux

B CentOS uses <code>apt</code> package manager; Fedora uses <code>yum</code>

C CentOS is community-driven; Fedora is commercially supported by Red Hat

D CentOS is a stable, long-term support distribution; Fedora is a cutting-edge, short lifecycle distribution

💡 Hint

Think about how often each distribution releases new versions and their target users.

CentOS focuses on stability and long-term support, suitable for servers. Fedora offers newer software with a faster release cycle, targeting developers and enthusiasts.

Practice

1. Which Linux distribution is known for being beginner-friendly and suitable for general use?

easy

A. Ubuntu

B. CentOS

C. Fedora

D. Arch Linux

Solution

1. Step 1: Understand beginner-friendly distributions

   Ubuntu is widely recognized for its ease of use and beginner-friendly interface.

2. Step 2: Compare with other distributions

   CentOS is more server-focused and Fedora targets advanced users, so they are less beginner-friendly.

3. Final Answer:

   Ubuntu -> Option A

4. Quick Check:

   Beginner-friendly = Ubuntu [OK]

Hint: Ubuntu = beginner-friendly, CentOS = servers, Fedora = advanced [OK]

Common Mistakes:

• Confusing CentOS as beginner-friendly
• Thinking Fedora is for beginners
• Choosing Arch Linux which is advanced

2. Which command correctly installs a package on CentOS using the default package manager?

easy

A. apt-get install httpd

B. pacman -S httpd

C. dnf install httpd

D. yum install httpd

Solution

1. Step 1: Identify CentOS package manager

   CentOS traditionally uses yum as its package manager.

2. Step 2: Check command syntax

   yum install httpd is the correct syntax to install the Apache web server on CentOS.

3. Final Answer:

   yum install httpd -> Option D

4. Quick Check:

   CentOS uses yum = yum install [OK]

Hint: CentOS uses yum, Ubuntu uses apt, Fedora uses dnf [OK]

Common Mistakes:

• Using apt-get on CentOS
• Using pacman which is for Arch Linux
• Confusing dnf as default on CentOS

3. What will be the output of the command cat /etc/os-release | grep '^ID=' on a Fedora system?

medium

A. ID=fedora

B. ID=centos

C. ID=ubuntu

D. ID=debian

Solution

1. Step 1: Understand /etc/os-release file

   This file contains identification info about the Linux distribution, including the ID field.

2. Step 2: Recognize Fedora's ID value

   Fedora's ID in this file is fedora, so the grep command outputs ID=fedora.

3. Final Answer:

   ID=fedora -> Option A

4. Quick Check:

   Fedora ID = fedora [OK]

Hint: Fedora's ID in os-release is 'fedora' [OK]

Common Mistakes:

• Assuming ID=ubuntu on Fedora
• Confusing CentOS and Fedora IDs
• Not using grep correctly

4. You try to update packages on Fedora using yum update but get an error. What is the likely cause?

medium

A. CentOS commands work on Fedora without changes

B. You need to run 'apt-get update' instead

C. Fedora uses 'dnf' instead of 'yum' for package management

D. You must use 'pacman' on Fedora

Solution

1. Step 1: Identify Fedora's package manager

   Fedora uses dnf as its default package manager, replacing yum.

2. Step 2: Understand error cause

   Using yum update on Fedora may fail because yum is deprecated or not installed by default.

3. Final Answer:

   Fedora uses 'dnf' instead of 'yum' for package management -> Option C

4. Quick Check:

   Fedora package manager = dnf [OK]

Hint: Fedora uses dnf, not yum, for updates [OK]

Common Mistakes:

• Trying apt-get on Fedora
• Assuming CentOS commands always work
• Using pacman which is Arch Linux's manager

5. You want to set up a stable web server environment with long-term support and minimal updates. Which Linux distribution should you choose?

hard

A. Ubuntu

B. CentOS

C. Fedora

D. Debian Testing

Solution

1. Step 1: Understand stability and support needs

   Stable web servers require long-term support and minimal frequent updates to avoid disruptions.

2. Step 2: Match distribution to requirements

   CentOS is known for its stability and long-term support, making it ideal for servers.

3. Step 3: Compare other options

   Fedora is cutting-edge and updates often; Ubuntu is user-friendly but less stable long-term; Debian Testing is unstable.

4. Final Answer:

   CentOS -> Option B

5. Quick Check:

   Stable server = CentOS [OK]

Hint: Choose CentOS for stable, long-term server setups [OK]

Common Mistakes:

• Choosing Fedora for stability
• Assuming Ubuntu is best for servers
• Picking Debian Testing for production