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SUSE Linux: Install RPM File And Packages

Suse Linux is similar to RPM based Linux distro such as RHEL but does not comes with yum command. How do I install a rpm file or packages such as Apache or PHP under Suse Enterprise / OpenSuse Linux?
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HowTo: Update Linux Kernel With ksplice

I've followed this tutorial to install ksplice and I'm not sure how to upgrade kernel with ksplice without rebooting the server?
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I would like to only download the packages via yum and not install/update them. How do I download a RPM package using yum command under CentOS Enterprise Linux server 5.x or RHEL 5.x systems?
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Q. Why does my yum command fail with an error that a repo is listed more than once under Fedora / RHEL / CentOS Linux? This error occurs when I type yum clean command

Loading "rhnplugin" plugin
Loading "security" plugin

Repository xen-repo is listed more than once in the configuration

How do I fix this problem?

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Q. I'm using RHEL 4.x as database server. How can I run the up2date command to find out what package will satisfy library / module dependencies via RHN?

A.Update Agent provides a complete system for updating the RPM packages installed on a Red Hat Enterprise Linux system. Both command line and graphical interfaces are included.

Update Agent has a quite a few configuration options, including but not limited to: installing packages after they are downloaded; downloading source RPMs along with binary RPMs; whether or not to upgrade packages where the default configuration file(s) have been modified, and more.

--whatprovides=<dependencies> option

Use the following syntax to query the RHN servers to resolve the comma separated list of dependencies. It will return a list of packages that will satisfy these dependencies:

up2date --whatprovides=<dependencies>

For example, if an error read as follows:

error: failed dependencies:
      libxyz.so    is needed by httpd
      libabc.so.1  is needed by httpd

To find out all libs or module dependencies in any of the package, enter:
# up2date --whatprovides=libxyz.so,libabc.so.1
Output:

packagename-1.15

Now just install packagename-1.15:
# up2date packagename

Q. How do I list all packages available for installation from Internet using Red Hat Enterprise Linux or CentOS 5?

A. You can yum command and it has option to show a list of all packages that are not presently installed and can be installed via RHN or Internet.
yum list available
yum list available | less
yum list available | grep package
yum list available "pacakge"

A note about RHEL <= version 4.0

If you are using RHEL v4.0 or old version, use up2date command:
up2date --show-available

Q. After re-installing my HP server system, RHN is not working. How do I re-register my system with Red Hat Network (RHN) again?
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