1、从服务器上下载文件
scp username@servername:/remote_path/remote_filename /local_path
2、上传本地文件到服务器
scp /local_path/local_filename username@servername:/remote_path
3、从服务器下载整个目录
scp -r username@servername:/remote_path/remote_foldername /local_path
4、上传目录到服务器
scp -r /local_path/local_foldername username@servername:/remote_path