Uninstalling a package is just as simple as installing:
$ rpm -e foo
Notice that we used the package name ``foo'', not the name of the original package file ``foo-1.0-1.i386.rpm''.
You can encounter a dependency error when uninstalling a package if some other installed package depends on the one you are trying to remove. For example:
$ rpm -e foo removing these packages would break dependencies: foo is needed by bar-1.0-1
To cause RPM to ignore that error and uninstall the package anyway (which is a bad idea since the package that depend on it will probably fail to work properly), use -nodeps on the command line.