def tail(self, argv):
        """tail <fname> [<filter>]
    tail a file, using the optional filter regular expression to filter lines."""
        fname = argv[1]
        if len(argv) > 2:
            filt = argv[2]
        else:
            filt = None
        s = self._obj
        s.tail(fname, filt)
        try:
            while 1:
                l = s.readline()
                self._print(l)
        except __HOLE__:
            s.interrupt()
dataset/ETHPy150Open kdart/pycopia/QA/pycopia/QA/controller_cli.py/ConfiguratorShellCLI.tail