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Yum (Yellowdog Updater, Modified)

yum (Yellowdog Updater, Modified) is a package manager used primarily in Red Hat-based Linux distributions such as Red Hat Enterprise Linux (RHEL), CentOS, and Fedora. It helps users and system administrators to install, update, and manage software packages on their systems.

Here are some key points about yum:

Package Management​

yum is used to perform package-related operations like installing, updating, and removing software packages. It handles package dependencies, making it easier to maintain a system with a large number of packages.

Repositories​

yum relies on software repositories where packages are hosted. These repositories can be provided by the distribution itself, third-party sources, or locally created repositories.

Configuration files for repositories are usually located in the /etc/yum.repos.d/ directory.

Package Installation​

To install a package with yum, you typically use the install command, followed by the package name. For example:

$ sudo yum install package_name

Package Updates​

To update all packages on your system, you can use the update command:

$ sudo yum update

Package Removal​

To remove a package, you use the remove command:

$ sudo yum remove package_name

Search for Packages​

You can search for available packages using yum search keyword. This helps you find packages by name or description.

List Installed Packages​

You can list all installed packages with yum list installed. This provides a comprehensive list of packages installed on your system.

Clean Package Cache​

Over time, yum caches packages to speed up future operations. You can clean the cache with yum clean all.

Dependencies Resolution​

yum automatically resolves and installs dependencies required by the packages you want to install, ensuring that your software functions correctly.

Replacement by DNF​

In some newer Red Hat-based distributions, yum has been largely replaced by dnf (Dandified YUM). dnf offers similar functionality with improvements in speed and dependency resolution. It is recommended to use dnf on these systems.


In summary, yum is a powerful and flexible package management tool designed for Red Hat-based Linux distributions. It simplifies the process of installing and managing software packages, making it easier to keep your system up to date and secure.


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