server with sites set up for download files sometimes provide an
anonymous ftp account
数据传输
ftp 192.168.0.128
name: username
password:user‘s password
commands
-cd.led
-drr
-bye
-bin.asc
-get put mget mput
-hash
-prompt
原文：http://www.cnblogs.com/cici-new/p/4240549.html