code: def getFiles(self,args):
          
          fileList = []
          if args.recursive:    # The list is created by going through the folder(s) recursively:
              fileList = self.createListRecursively(args)
          else:    # The list is created by going through the provided folder(s):
              fileList = self.createList(args)
          if args.directories:
              # If directories are returned, the list is sorted in reverse order.
              # This allows the processing of subfolders before the processing of the parent folder.
              # Processing the parent folder first may not work because the command may remove
              # or rename the folder, which would affect the subfolders.
              fileList = [element for element in fileList if os.path.isdir(element)]
              return sorted(fileList,reverse=True)
          else:
              # Filter out all directories:
              fileList = [element for element in fileList if os.path.isfile(element)]
  	    if args.extensions != None:    # Files are filtered based on their extensions:
                  extensionList = self.getExtensionList(args.extensions)
                  fileList = [element for element in fileList if os.path.splitext(element)[1] in extensionList]
              # The files in the list are sorted in lexicographical order:
              return sorted(fileList)
docs: This is the main method of the class. Given the arguments,
          the corresponding list of all files (or directories if the -d option is used)
          are returned.