Red Hat NETWORK SATELLITE 5.3.0 - CHANNEL MANAGEMENT, Reference Manual

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Chapter 3. Package Updater
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3.3. Updating Packages from the Command Line with
yum
The foundation of the
Package Updater
is the Yum package manager, developed by Duke University
to improve the installation of RPMs.
yum
searches supported repositories for packages and their
dependencies so they may be installed together in an effort to alleviate dependency issues. Red Hat
Enterprise Linux 5 uses
yum
to fetch packages and install packages.
up2date
is not available on Red Hat Enterprise Linux 5, which uses Yum (Yellowdog Updater
Modified). The entire stack of tools that installs and updates software in Red Hat Enterprise Linux 5
is now based on Yum. This includes everything from the initial installation via
Anaconda
installation
program to host software management tools like
pirut
.
3.3.1.
yum
Commands
yum commands are typically typed as the following:
yum command [ package_name ]
By default, Yum will automatically attempt to check all configured repositories to resolve all package
dependencies during an installation or upgrade. The following is a list of the most commonly-used
yum
commands. For a complete list of available yum commands, refer to
man yum
.
yum install package_name
Used to install the latest version of a package or group of packages. If no package matches the
specified package name(s), they are assumed to be a shell wildcard, and any matches are then
installed.
yum update
package_name
Used to update the specified packages to the latest available version. If no packages are
specified, then
yum
will attempt to update all installed packages.
If the
--obsoletes
option is used (i.e.
yum --obsoletes package_name
), yum will process
obsolete packages. As such, packages that are obsoleted across updates will be removed and
replaced accordingly.
yum check-update
This command allows you to determine whether any updates are available for your installed
packages.
yum
returns a list of all package updates from all repositories if any are available.
yum remove
package_name
Used to remove specified packages, along with any other packages dependent on the packages
being removed.
yum provides
package_name
Used to determine which packages provide a specific file or feature.
yum search
keyword
This command is used to find any packages containing the specified keyword in the description,
summary, packager and package name fields of RPMs in all supported repositories.