Verify the integrity of a rpm package

rpm --checksig package.rpm

Build a rpm package from a rpm source

rpmbuild --rebuild package_name.src.rpm

Use this command to build an RPM if you have a Spec File

rpmbuild -ba SPEC_FILE

This will install an RPM, and try to resolve all the dependencies for you using your repositories.

yum localinstall package_name.rpm

Install a rpm package

rpm -ivh package.rpm

Show space used by rpm packages installed sorted by size (fedora, redhat and like)

rpm -q -a --qf "%10{SIZE}\t%{NAME}\n" | sort -k1,1n