卸载deb包时候，可以连不要的依赖关系包一起删除，但是多如牛毛的rpm却不可以。
这个真的是rpm的痛！
yum仅仅能在线安装rpm，但是只能在安装的时候解决依赖关系，卸载的时候却不行。
不过，有个工具可以专门解决rpm依赖关系：package-cleanup
Options:
-h, --help show this help message and exit
--problems List dependency problems in the local RPM database
--leaves List leaf nodes in the local RPM database
--all When listing leaf nodes also list leaf nodes that are
not libraries
--orphans List installed packages which are not available from
currenly configured repositories.
-q, --quiet Print out nothing unecessary
-y Agree to anything asked
-d, --dupes Scan for duplicates in your rpmdb
--cleandupes Scan for duplicates in your rpmdb and cleans out the
older versions
--oldkernels Remove old kernel and kernel-devel packages
--count=KERNELCOUNT Number of kernel packages to keep on the system
(default 2)
--keepdevel Do not remove kernel-devel packages when removing
kernels
-c CONFFILE config file location
Please specify either --problems, --leaves, --orphans or --oldkernels
例如，你不小心安装了gnome-games，然后马上把这个卸载。你会发现只卸载了gnome-games，那些“包庇”gnome-games的“同党”还留在你的硬盘里！
这时，你输入：package-cleanup --leaves
就会列出一系列的关系包，都是在rpm数据库里没有被依赖的依赖包。
把这些包统统remove，你的硬盘从此干净了。