输入cd DDos-Attack或chmod +x ddos-attack.py时，termux没反应

我在termux输入git clone Page not found · GitHub · GitHub GitHub is where people build software. More than 65 million people use GitHub to discover, fork, and contribute to over 200 million projects. https://github.com/Ha3MrX/DDos-Attack%E6%88%90%E5%8A%9F%E5%90%8E%EF%BC%8C%E6%83%B3%E8%AF%95%E4%B8%80%E4%B8%8B%EF%BC%8C%E7%84%B6%E5%90%8E%E6%88%91%E5%B0%B1%E8%BE%93%E5%85%A5cd DDos-Attack或chmod +x ddos-attack.py，结果没反应，以前都是有用的，这是怎么回事？