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RPM - Package management
A good place for information is from he maxrpm book
http://www.rpm.org/max-rpm/s1-rpm-query-handy-queries.html
But here are my favorites:
Finding the Largest Installed Packages
rpm -qa --queryformat '%{name}-%{version}-%{release} %{size}\n' | sort -nr +1
Finding Recently Installed Packages
rpm -qa --queryformat '%{installtime} %{name}-%{version}-%{release} %{installtime:date}\n' | sort -nr +1 | sed -e 's/^[^ ]* //'
Created: 2005-08-18 05:59:16
Modified: 2005-08-26 00:57:20