renaming files

How can I do a mass re-naming of files in a directory? Like, I have a
bunch of files with an underscore in the file name, but I need to
replace all instances of the underscore in the name with a period.

Example:

This_Is_The_Current_File_Name changes to This.Is.The.Current.File.Name

Thanks

-- 
Scott Johnson
scott.a.johnson@gmail.com
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