我无法将 john-1.7.9.tar.gz 从下载文件夹移动到 opt 文件夹，我试过了
sudo cp -r /home/kevsfernandez/downloads john-1.7.9.tar.gz /opt
只是说
cp: cannot stat ‘/home/kevsfernandez/downloads’: No such file or directory
cp: cannot stat ‘john-1.7.9.tar.gz’: No such file or directory
directory ×1