def operate(cathcode, workingDirectory, mmultPath, verbose):
"""TO run mmult is mandatory to move to the working directory"""
command = os.path.join(mmultPath,"mmult ") + cathcode + ".mmult"
#http://docs.python.org/lib/os-process.html#os-process
if workingDirectory == ".":
workingDirectory = os.getcwd()
os.chdir(workingDirectory)
executeCommand(command, verbose)