How to degrade rpm package version
I installed a high version rpm package by mistake , should install a low version.
But I don’t want to uninstall the high version firstly and then install low version.
Because uninstall the high version could cause some errors, especially the library package.
So degrade package version is a better choice, for example:
rpm -Uvh –oldpackage glib2-2.54.2-2.el7.x86_64.rpm
ldconfig