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1. How to check when RPM packages were installed:
a. if you do not know the exact package:
[root@florian ~]# rpm -qa --last | grep kernel kernel-devel-2.6.32-358.11.1.el6.x86_64 Thu 15 Aug 2013 02:23:46 PM CEST kernel-2.6.32-358.11.1.el6.x86_64 Thu 15 Aug 2013 02:16:15 PM CEST kernel-headers-2.6.32-358.11.1.el6.x86_64 Thu 15 Aug 2013 02:12:47 PM CEST kernel-firmware-2.6.32-358.11.1.el6.noarch Thu 15 Aug 2013 02:12:38 PM CEST kernel-failsafe-2.6.32-358.el6.1.x86_64 Wed 12 Jun 2013 12:59:27 PM CEST dracut-kernel-004-303.el6.noarch Wed 12 Jun 2013 12:53:12 PM CEST
b. if you know the package:
[root@florian ~]# rpm -q --last kernel-devel-2.6.32-358.11.1.el6.x86_64 kernel-devel-2.6.32-358.11.1.el6.x86_64 Thu 15 Aug 2013 02:23:46 PM CEST