在终端里，使用ftp命令，如何进入主动模式，具体应该输入什么指令

试一下mode active，这里是Mac下的ftp命令。
可以直接help，里面有详细的帮助。

ftp> help
Commands may be abbreviated. Commands are:

! features mls prompt site
$ fget mlsd proxy size
account form mlst put sndbuf
append ftp mode pwd status
ascii gate modtime quit struct
bell get more quote sunique
binary glob mput rate system
bye hash mreget rcvbuf tenex
case help msend recv throttle
cd idle newer reget trace
cdup image nlist remopts type
chmod lcd nmap rename umask
close less ntrans reset unset
cr lpage open restart usage
debug lpwd page rhelp user
delete ls passive rmdir verbose
dir macdef pdir rstatus xferbuf
disconnect mdelete pls runique ?
edit mdir pmlsd send
epsv4 mget preserve sendport
exit mkdir progress set

ftp> help mode
mode set file transfer mode