Reinstalling Packages on CentOS or RHEL Revision as of Monday, 21 December 2015 at 02:30 UTC

Installed package lists are kept in /var/log/rpmpkgs.

 cp /var/log/rpmpkgs /backups/packages

Reinstall with

 yum install $(sed 's/-[0-9].*.rpm$//g' /backups/packages | tr '\n' ' ')