File Directory Ruby

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  4. Dir with patterns
Dir['*.data']       # Files with the "data" extension
Dir['ruby.*']       # Any filename beginning with "ruby."
Dir['?']            # Any single-character filename
Dir['*.[ch]']       # Any file that ends with .c or .h
Dir['*.{java,rb}']  # Any file that ends with .java or .rb
Dir['*/*.rb']       # Any Ruby program in any direct sub-directory
Dir['**/*.rb']      # Any Ruby program in any descendant directory