Nico's is missing the '\n'. It should be:

     rm -rf /tmp/failed /tmp/success
     mkdir /tmp/failed /tmp/success
     RPMLIST=`rpm -qa --qf '%{name}-%{version}-%{release}.%{arch}\n'`
     for name in $RPMLIST; do
            yum reinstall $name -y 2>/tmp/failed/$name >/tmp/success/$name
     done

There are reasons I do them one at a time, and record the results.
It's also possible to manipulate with "--excluderepo=" and
"-includerepo" options, and store the errors.