Runs the current command and passes its output to the next
        given process.

def pipe(self, command, timeout=None, cwd=None):
        """Runs the current command and passes its output to the next
        given process.
        """
        if not timeout:
            timeout = self.timeout

        if not self.was_run:
            self.run(block=False, cwd=cwd)

        data = self.out

        if timeout:
            c = Command(command, timeout)
        else:
            c = Command(command)

        c.run(block=False, cwd=cwd)
        if data:
            c.send(data)
        c.block()
        return c