yum/dnf (RHEL/CentOS) basics in Linux CLI - Practice Problems & Coding Challenges

Challenge - 5 Problems

💻 Command Output

intermediate

What is the output of this command?

You run the command yum list installed httpd on a RHEL system. What will this command output?

Linux CLI

yum list installed httpd

A Lists the installed version of the httpd package if installed, or shows 'Error: No matching Packages to list'

B Installs the httpd package

C Removes the httpd package

D Updates the httpd package to the latest version

💡 Hint

Think about what 'list installed' means in yum.

The command 'yum list installed httpd' shows if the httpd package is installed and its version. It does not install, remove, or update packages.

💻 Command Output

intermediate

What happens when you run this command?

What is the result of running dnf clean all on a CentOS system?

Linux CLI

dnf clean all

A Installs all available updates

B Removes all installed packages

C Removes all cached package data and metadata, freeing disk space

D Lists all enabled repositories

💡 Hint

Think about what 'clean' means in package managers.

'dnf clean all' deletes all cached data including metadata and packages, which helps free disk space and forces fresh downloads next time.

📝 Syntax

advanced

Which command correctly installs a package and its dependencies?

You want to install the package 'vim' along with all its dependencies on a RHEL system. Which command is correct?

A dnf update vim

B yum get vim

C dnf remove vim

D yum install vim

💡 Hint

The command should add a package, not remove or update it.

'yum install vim' installs the vim package and all required dependencies. 'yum get' is invalid, 'dnf remove' deletes packages, and 'dnf update' upgrades existing packages.

🚀 Application

advanced

How to check which repository provides a package?

You want to find out which enabled repository provides the package 'curl' on a CentOS system. Which command will show this information?

A yum list installed curl

B dnf repoquery --whatprovides curl

C dnf clean all

D yum remove curl

💡 Hint

Look for a command that queries repositories for package info.

'dnf repoquery --whatprovides curl' lists which repository supplies the curl package. Other commands list installed packages, clean cache, or remove packages.

🔧 Debug

expert

Why does this command fail with 'No match for argument' error?

You run yum install httpd-tools-2.4.6 but get the error 'No match for argument: httpd-tools-2.4.6'. What is the most likely reason?

Linux CLI

yum install httpd-tools-2.4.6

A The package name should not include the version number; use 'yum install httpd-tools' instead

B The package is already installed, so yum refuses to install it again

C The system is offline and cannot reach repositories

D The command syntax is incorrect; 'yum install -v httpd-tools-2.4.6' is required

💡 Hint

Think about how yum expects package names.

Yum expects package names without version numbers. Including the version causes no match error. To install a specific version, a different syntax is needed.