FTP 所有命令
! delete literal prompt
? debug ls put
append dir mdelete pwd
ascii disconnect mdir quit
bell get mget quote
binary glob mkdir recv
bye hash mls remoteh
cd help mput rename
close lcd open rmdir
! literal
? debug ls
append dir mdelete pwd
disconnect mdir quit
bell quote
glob mkdir recv
hash mls remoteh
cd rename
close rmdir