1)从服务器下载文件
scp username@servername:remote_file_path local_file_path
2)上传本地文件到服务器
scp local_file_path username@servername:remote_file_path
3)从服务器下载整个目录
scp -r username@servername:remote_dir/ local_dir
4)上传目录到服务器
scp -r local_dir username@servername:remote_dir