Find architechture of installed RPM package
When trying to find a rpm package on a 64 bit installation of Red Hat, you will sometime encounter two packages with the same name:
# rpm -qa zlib zlib-1.2.1.2-1.2 zlib-1.2.1.2-1.2
This happens when a 32 as well as a 64 bit package exists on the server. If you want to find out which is which, you will have to use a somewhat trickier rpm command:
rpm -qa --qf "%{n}-%{v}-%{r}.%{arch}\n" zlib
zlib-1.2.1.2-1.2.i386
zlib-1.2.1.2-1.2.x86_64
Voila