def echo(self, argv):
        self._print(" ".join(argv[1:]))
        return self._environ["_"]
:param dict env: A custom environment to launch the Go command in.  If `None` the current
dataset/ETHPy150Open kdart/pycopia/fepy/pycopia/fepy/CLI.py/BaseCommands.echo--crossover with--dataset/ETHPy150Open pantsbuild/pants/contrib/go/src/python/pants/contrib/go/subsystems/go_distribution.py/GoDistribution.GoCommand.spawn