--- Net::FTP#sendcmd(cmd)

    cmdǻꤵ줿ޥɤ򥵡Сꡢ Сα֤ޤ 

    ɤ4xxξ㳰FTPTermError5xxξ
    㳰FTPPermErrorȯޤ
    ɤκǽο15ΤɤǤʤ
    㳰FTPProtoErrorȯޤ

