使用lftp与sftp获取远端文件脚本
因为工作的原因，需要每日使用sftp获取远程主机上的文件，所以就在想能不能脚本化，这样就不用天天定时定点的在服务器前面守着了。
lftp是linux下面的一个ftp客户端工具，使用起来非常方便，它的参数如下：
[zhou@localhost ~]$ lftp -h
Usage: lftp [OPTS] <site>
`lftp' is the first command executed by lftp after rc files
-f <file> execute commands from the file and exit
-c <cmd> execute the commands and exit
--help print this help and exit
--version print lftp version and exit
Other options are the same as in `open' command
-e <cmd> execute the command just after selecting
-u <user>[,<pass>] use the user/password for authentication
-p <port> use the port for connection
<site> host name, URL or bookmark name
