I would make an attempt at reinstalling the package.
To find out what package it belongs to, do a "which ps" to see where it is located. Then do a "rpm -q --whatprovides /path/to/ps". Once you figure out what packge it belongs to, try reinstalling it with "rpm -e <packagename>" to uninstall it and then a "rpm -ivh packagename.rpm" to reinstall it.
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