Yum has a concept of group in which related packages are grouped together.

A repository can be created by creating a file in path : /etc// ~]# yum downgrade firefox.we need to create a repository i.e central location in which data/packages/software are stored. “/etc/yum.conf” is the main configuration file for yum command.As we know yum command is used for various purposes like installing, removing ,updating rpms. In this article we will discuss 21 useful yum command examples, But if we are using yum command then you need not to be worry about dependencies because yum resolves dependencies by searching packages in its own repository. Now we have two options to install mysql rpm either with rpm command or yum command, if we try to install mysql using rpm command then it will through dependencies errors. In order to use MySQL in our system we need install software or rpm with name MySQL. Let’s understand it by an example, let’s assume we want to setup MySQL database in our system.

Yum helps to resolve dependencies during installation of any software (rpms). Package manager according to wiki are tools that automates the process of installing, upgrading, configuring, and removing computer programs for a computer’s operating system in a consistent manner. Yum stands for Yellowdog Updater Modified and it is a package manager, which helps us to install, remove, and update rpm packages on CentOS and RHEL systems.

Yum list repos