The Red Hat Package Manager (RPM) is a tool that facilitates installing, uninstalling, and upgrading software for your Red Hat Linux system. It is a file that contains executable programs, scripts, documentation, and other files needed by an application or software unit. RPM packages are generally named using a convention that lets you determine the name of the package, the version of the software, the release number of the software, and the system architecture for which the application is intended. The following diagram shows how the components of a package name are arranged:
(1) Name
(2) Version
(3) Release
(4) Architecture
When you update a package, RPM installs the new version of the software but attempts to leave your existing configuration files intact. You can update a package by using the -U option of the rpm command:
rpm -Uvh package
When you update a package, RPM automatically uninstalls the old version of the package before installing the new one.
http://www.ibm.com/developerworks/linux/library/l-rpm2/index.html
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