Here is what I have come up with so far as a more efficient method (though I still haven't figured out the last part, and there may be more efficient methods). If anyone can suggest a more efficient way to identify the software that doesn't come with the operating system on a RHEL machine, it would be greatly appreciated! I can't tell if avahi-glib is installed as part of the avahi package). The problems I am encountering with this method is it is tedious / timeconsuming, and just the source packages are listed (e.g. Can anyone suggest an efficient way to do this? The way I was doing it is manually comparing the list of installed software with the list on Red Hat's FTP site for the relevant operating system:

This is often not helpful, but what you may really want to use is 'yum list-updateinfo new' from the security yum plugin.I have been tasked with identifying new (non-operating system) software installed on several Red Hat Enterprise Linux (RHEL) machines. List packages recently added into the repositories. List the packages installed on the system that are obsoleted by packages in any yum repository listed in the config file. List the packages installed on the system that are not available, by name, in any yum repository listed in the config file. List the packages installed on the system that are not available in any yum repository listed in the config file.

If an argument does not match the name of an available package, it is assumed to be a shell-style glob and any matches are printed. List all packages with updates available in the yum repositories. List all packages in the yum repositories available to be installed. List all available and installed packages. Name.arch version-release repo or that if the repo cannot be determined, 'installed' is printed instead.

Note that all list commands include information on the version of the package. The following are the ways which you can invoke yum in list mode. List Is used to list various information about available packages According to Yum man: info Display details about a package or group of packages Given that your question is about the packages installed using yum, then You have to check the options info and list 'sub-flags'.

Rhel list installed packages