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Software Management with RPM and Yum

The Redhat Package Manager, or rpm, is the core package medium for software packing with Redhat and CentOS Linux. All default system software is installed using rpm files for the distribution, and further software can be installed/updated from rpm designed for that distribution as well.

The Yellowdog Updater Modified, or 'yum', is an RPM compatible package management tool. With yum, system software can be installed, updated, and queried from remote rpm package repositories. With yum, most system software can be retrieved and installed automatically.

RPM

With the 'rpm' tool, packages can be installed from the local or remote file systems, and information about installed packages can be quieried.

Command	Purpose
rpm -ivh ./package-1.2-3.el5.x86_64.rpm	Install a local rpm package.
rpm -ivh http://url-to-package.rpm	Install a remote rpm package.
rpm -Uvh ./package-1.2-3.el5.x86_64.rpm	Update an installed package.
rpm -e package	Remove an installed package.
rpm -qa	List all installed packages.
rpm -ql package	List all files for installed package.
rpm -qo /usr/sbin/httpd	Find which package a file belongs to.

Yum

Yum is a front-end to rpm, which is used to remove and install from a package repository.

Command	Purpose
yum update	Search for any package updates available from the enabled repositories.
yum install package	Install the latest version available, and any dependencies.
yum remove package	Remove an installed package. Any packages that were installed as a dependency will also be removed.
yum info package	Provide information about a package.
yum search string	Search the repository cache.
yum clean all	Clean out temporary and downloaded files from the local cache.