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Version of what, a particular program ?? Usually you can do the program name with a --version afterwards.. but that doesn't always work. Check the programs documentation for more details on obtaining version numbers.
If you're talking about RPM (Red Hat package Manager) you can check which packages that have been installed by typing:
# rpm -qa
To remove a certain package installed using rpm:
# rpm -e NAME_OF_PACKAGE
where "NAME_OF_PACKAGE" is in the list you got by running the command "rpm -qa".
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