Another case : when you upgrade your linux box, you will also see forgotten packages (check with rpm -qa --last command !)
rpmorphan finds "orphaned" packages on your system. It determines which packages have no other packages depending on their installation, and shows you a list of these packages. It intends to be clone of deborphan debian tools for rpm packages.
It will try to help you to remove unused packages, for exemple :
* after a distribution upgrade
* when you want to suppress packages after some tests
several tools are also provided :
* rpmusage : display rpm packages last use date
* rpmdep : display the full dependency of an installed rpm package
* rpmduplicates : find programs with several version installed
Installation: use "1-click" installer to install the package
OpenSuSe 11.1 - here
OpenSuSe 11.0 - here
After successful installation, for a quick start, try the following command: # rpmorphan --gui --all
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source:http://linuxpoison.blogspot.com/2009/05/13578175711040.html