libXp.so.6: cannot open shared object file: No such file or directory
how do you know what Linux package to load?
When installing the Linux operating system, there are many "optional packages" (often known as RPMs) that can be installed. Requirements change, so a new software installation can require a file that you have not previously installed.
How can you find out which bundle to install?
The "yum" utility has a "whatprovides" option to answer this question.
yum whatprovides <file>
So in the example above, you should use the command:
# yum whatprovides libXp.so.6
Loaded plugins: refresh-packagekit, rhnplugin
*Note* Red Hat Network repositories are not listed below. You must run this command as root to access RHN repositories.