code: def catCSVs(folder, ouputFileName, removeDups = False) :
  	
  	strCmd = r"""cat %s/*.csv > %s""" %(folder, ouputFileName)
  	os.system(strCmd)
  
  	if removeDups :
  		removeDuplicates(ouputFileName, ouputFileName)
docs: Concatenates all csv in 'folder' and wites the results in 'ouputFileName'. My not work on non Unix systems