rpm -U 和 rpm -F 有什么区别

Question

有点糊涂。

什么之间的差异rpm -U和rpm -F

手册页说 -U 升级包

-F, --freshen=+ 升级包（如果已经安装）

Answer 1

相比

   rpm {-U|--upgrade} [install-options] PACKAGE_FILE ...

   This  upgrades  or  installs the package currently installed to a newer
   version.  This is the same as install, except all other  version(s)  of
   the package are removed after the new package is installed.

到

   rpm {-F|--freshen} [install-options] PACKAGE_FILE ...

   This  will upgrade packages, but only ones for which an earlier version
   is installed.