Installing, updating, removing packages in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of updating package lists with apt?

You run the command sudo apt update on a Debian-based system. What is the expected output shown?

Linux CLI

sudo apt update

A Displays the current kernel version

B Installs all available package updates automatically

C Removes unused packages from the system

D Lists package sources and shows 'Reading package lists... Done' with no errors

💡 Hint

Think about what 'apt update' does before installing or upgrading.

The 'apt update' command refreshes the package lists from repositories but does not install or remove packages.

💻 Command Output

intermediate

What happens when you run 'yum remove' on a package?

On a Red Hat-based system, you run sudo yum remove httpd. What is the expected result?

Linux CLI

sudo yum remove httpd

A Lists all installed packages including httpd

B Updates the httpd package to the latest version

C Uninstalls the httpd package and its dependencies no longer needed

D Installs the httpd package if missing

💡 Hint

Removing a package deletes it from the system.

'yum remove' deletes the specified package and any dependencies that are no longer required.

📝 Syntax

advanced

Which command correctly installs a package with dnf?

Choose the correct command to install the package 'nano' using dnf on Fedora.

A sudo dnf install nano

B sudo dnf get nano

C sudo dnf update nano

D sudo dnf remove nano

💡 Hint

The command to add a package is 'install'.

'dnf install' is the correct syntax to add a package. 'get' is invalid, 'update' upgrades, 'remove' deletes.

💻 Command Output

advanced

What message is shown when removing a non-existent package with apt?

You run sudo apt remove nonexistent-package. What is the expected output?

Linux CLI

sudo apt remove nonexistent-package

A Package 'nonexistent-package' is not installed, so not removed

B Package nonexistent-package removed successfully

C Reading package lists... Done

D All packages are up to date

💡 Hint

apt remove checks if the package is installed on the system.

apt reports 'Package 'nonexistent-package' is not installed, so not removed' when attempting to remove a package that is not installed.

🚀 Application

expert

How many packages are upgraded after running 'sudo apt upgrade'?

After running sudo apt update and then sudo apt upgrade, the output shows 5 packages will be upgraded. What is the number of packages actually upgraded after the upgrade completes successfully?

Linux CLI

sudo apt update && sudo apt upgrade -y

A 0

B 5

C Depends on user confirmation

D All installed packages

💡 Hint

The upgrade command installs all listed upgrades unless interrupted.

If 5 packages are listed to upgrade and the upgrade runs with automatic yes, all 5 are upgraded.

Practice

1. Which command is used to install a new package on a Debian-based Linux system?

easy

A. apt upgrade package_name

B. apt update package_name

C. apt remove package_name

D. apt install package_name

Solution

1. Step 1: Understand the purpose of apt install

   The apt install command is used to add new software packages to the system.

2. Step 2: Differentiate from other commands

   apt update refreshes package lists, apt upgrade updates installed packages, and apt remove deletes packages.

3. Final Answer:

   apt install package_name -> Option D

4. Quick Check:

   Install new software = apt install [OK]

Hint: Install packages with 'apt install' command [OK]

Common Mistakes:

• Confusing 'apt update' with installation
• Using 'apt remove' to install packages
• Trying 'apt upgrade' to add new software

2. Which of the following is the correct syntax to update the package list on a Debian-based system?

easy

A. apt update

B. apt install update

C. apt upgrade

D. apt remove update

Solution

1. Step 1: Identify the command to refresh package lists

   apt update downloads the latest package information from repositories.

2. Step 2: Understand other commands

   apt upgrade installs available updates, not refreshes lists; others are invalid.

3. Final Answer:

   apt update -> Option A

4. Quick Check:

   Refresh package list = apt update [OK]

Hint: Use 'apt update' to refresh package info before upgrades [OK]

Common Mistakes:

• Using 'apt upgrade' to update package lists
• Adding package names to 'apt update'
• Confusing 'apt remove' with update commands

3. What will be the output of the following commands sequence?

sudo apt update
sudo apt upgrade -y

medium

A. The system installs new packages listed in the upgrade command.

B. The system refreshes package lists and upgrades all upgradable packages automatically.

C. The system removes all outdated packages without confirmation.

D. The system only updates package lists but does not upgrade any packages.

Solution

1. Step 1: Analyze sudo apt update

   This command refreshes the package lists from repositories to get the latest versions.

2. Step 2: Analyze sudo apt upgrade -y

   This command upgrades all installed packages that have updates available, and the -y flag confirms automatically.

3. Final Answer:

   The system refreshes package lists and upgrades all upgradable packages automatically. -> Option B

4. Quick Check:

   Update + upgrade -y = refresh and auto-upgrade [OK]

Hint: Update lists then upgrade with -y to auto-confirm [OK]

Common Mistakes:

• Thinking upgrade installs new packages
• Assuming remove happens automatically
• Believing update upgrades packages

4. You run apt remove package_name but get an error saying the package is not installed. What is the likely cause?

medium

A. The package is already removed but still listed in the system.

B. You need to run apt update before removing packages.

C. The package name is misspelled or does not exist on the system.

D. You must use apt upgrade before removing packages.

Solution

1. Step 1: Understand the error context

   If apt remove says the package is not installed, it means the system cannot find that package installed.

2. Step 2: Identify common causes

   Most often, this happens because the package name is wrong or the package was never installed.

3. Final Answer:

   The package name is misspelled or does not exist on the system. -> Option C

4. Quick Check:

   Remove error = wrong or missing package name [OK]

Hint: Check package name spelling before removing [OK]

Common Mistakes:

• Trying to update before removing
• Assuming upgrade is needed before remove
• Ignoring error and forcing removal

5. You want to write a script that updates the package list, upgrades all packages, and then removes a package named oldapp. Which sequence of commands is correct?

hard

A. apt update
apt upgrade -y
apt remove oldapp -y

B. apt upgrade -y
apt update
apt remove oldapp -y

C. apt remove oldapp -y
apt update
apt upgrade -y

D. apt update
apt remove oldapp -y
apt upgrade -y

Solution

1. Step 1: Understand the correct order of package management commands

   First, update the package list with apt update to get latest info, then upgrade installed packages with apt upgrade -y, and finally remove unwanted packages.

2. Step 2: Check each option's order

   apt update
   apt upgrade -y
   apt remove oldapp -y

   follows the correct order: update, upgrade, then remove. Others have wrong sequences that may cause errors or outdated upgrades.

3. Final Answer:

   apt update apt upgrade -y apt remove oldapp -y -> Option A

4. Quick Check:

   Update -> Upgrade -> Remove sequence [OK]

Hint: Always update before upgrade, remove last [OK]

Common Mistakes:

• Upgrading before updating package lists
• Removing packages before upgrading
• Skipping update before upgrade