yum can help us here. This should do the trick:
#yum list installed
If you’re interested in a particular package, you can pipe a search string into grep and only list filtered results:
#yum list installed | grep "yum" keyutils-libs.i686 1.4-4.el6 @anaconda-CentOS-201303020136.i386/6.4 yum.noarch 3.2.29-40.el6.centos yum-metadata-parser.i686 yum-plugin-fastestmirror.noarch
The search string doesn’t even need to be in quotes, and partials work fine too.