apt (Debian/Ubuntu) basics in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of apt list --installed | grep bash?

You run the command apt list --installed | grep bash on a Debian/Ubuntu system. What will this command output?

Linux CLI

apt list --installed | grep bash

A Lists all available packages containing 'bash' but not necessarily installed ones.

B Shows an error: 'bash' is not a valid option for apt list.

C Outputs nothing because 'grep' is not installed by default.

D Lists all installed packages whose names contain 'bash', showing their versions and status.

💡 Hint

Think about what apt list --installed does and how grep filters output.

The command apt list --installed lists all installed packages. Piping it to grep bash filters the list to only those packages whose names contain 'bash'. This shows installed bash-related packages with their versions.

💻 Command Output

intermediate

What error does this command produce: apt-get install --dry-run nonexistent-package?

You try to simulate installing a package that does not exist using apt-get install --dry-run nonexistent-package. What error message or output will you get?

Linux CLI

apt-get install --dry-run nonexistent-package

A E: Unable to locate package nonexistent-package

B Simulates installation successfully with no errors

C Syntax error: unknown option '--dry-run'

D Warning: Package already installed

💡 Hint

Think about what happens when you try to install a package that does not exist in the repositories.

The apt-get command with --dry-run simulates installation. If the package does not exist, apt-get reports E: Unable to locate package error.

🔧 Debug

advanced

Why does this command fail: apt update && apt upgrade -y run as a normal user?

You run apt update && apt upgrade -y as a normal user (not root). The command fails. What is the reason?

Linux CLI

apt update && apt upgrade -y

A The system must be offline for 'apt upgrade' to work.

B Normal users do not have permission to update package lists or upgrade packages; root privileges are required.

C The '-y' option is invalid and causes the command to fail.

D The command syntax is incorrect; 'apt upgrade' must come before 'apt update'.

💡 Hint

Think about who can change system packages and update system files.

Updating package lists and upgrading packages require root privileges because they modify system files. Running as a normal user causes permission denied errors.

🚀 Application

advanced

How to list all packages that can be upgraded using apt?

You want to see which packages have updates available before upgrading. Which command will correctly list all upgradable packages?

A apt list --upgradable

B apt show upgradable

C apt search --upgrade

D apt-get list --upgradeable

💡 Hint

Check the official apt command options for listing upgradable packages.

The command apt list --upgradable lists all packages with available upgrades. Other options are invalid or do not exist.

🧠 Conceptual

expert

What is the effect of running apt-get clean on a Debian/Ubuntu system?

You run apt-get clean. What does this command do?

A Removes all installed packages that are no longer needed.

B Updates the package lists from the repositories.

C Deletes all cached package files from the local repository to free disk space.

D Upgrades all installed packages to the latest version.

💡 Hint

Think about what 'clean' means in the context of package management cache.

apt-get clean removes all downloaded package files (.deb) from the local cache, freeing disk space but not affecting installed packages.