List installed packages

This is an example for libgtk packages.

for x in `urpmq -Y -r libgtk`; do echo `rpmquery $x`; done | grep -v "is not installed"
libGtkScintilla0-0.8.2-5mdv2007

.0
libGtkScintilla0-devel-0.8.2-5mdv2007.0
libgtk+-x11-2.0_0-2.10.3-4mdv2007.0
libgtk+1.2-1.2.10-45mdv2007.0
libgtk+2.0_0-2.10.3-4mdv2007.0
libgtk+2.0_0-devel-2.10.3-4mdv2007.0
libgtk-linux-fb-2.0_0-2.4.14-6mdk
libgtkglarea2.0-1.99.0-9mdv2007.0
libgtkglarea5-1.2.3-9mdv2007.0
libgtkhtml-3.8_15-3.12.0-1mdv2007.0
libgtkhtml2_0-2.11.0-2mdv2007.0
libgtkmm2.0_1-2.2.12-3mdv2007.0
libgtkmm2.0_1-devel-2.2.12-3mdv2007.0
libgtkmm2.4_1-2.10.1-1mdv2007.0
libgtksourceview-1.0_0-1.8.0-1mdv2007.0
libgtkspell0-2.0.11-1mdk
libgtkspell0-devel-2.0.11-1mdk
libgtkxmhtml1-1.4.2-18mdv2007.0