Ruby FTP sendcmd错误

此代码返回以下错误

ftp = Net::FTP.new(IPAddress)
ftp.login(UserName, Password)
ftp.sendcmd("prompt")
ftp.sendcmd("mget filename*")

/usr/lib/ruby/1.9.1/net/ftp.rb:261:in'getresp'：500'PROMPT'：未理解命令（net:：FTPPermError） from/usr/lib/ruby/1.9.1/net/ftp.rb:269:in'voidresp' from/usr/lib/ruby/1.9.1/net/ftp.rb:292:in'block in voidcmd' from/usr/lib/ruby/1.9.1/monitor.rb:190:in'mon_synchronize' from/usr/lib/ruby/1.9.1/net/ftp.rb:290:in'voidcmd'

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为什么Ruby将我的命令转换为大写，而我用小写。

我不认为sendcmd是这样使用的。试试这个选择

/usr/lib/ruby/1.9.1/net/ftp.rb:261:in `getresp': 500 'PROMPT': command not understood (Net::FTPPermError) from /usr/lib/ruby/1.9.1/net/ftp.rb:269:in `voidresp' from /usr/lib/ruby/1.9.1/net/ftp.rb:292:in `block in voidcmd' from /usr/lib/ruby/1.9.1/monitor.rb:190:in `mon_synchronize' from /usr/lib/ruby/1.9.1/net/ftp.rb:290:in `voidcmd'

require 'net/ftp'
user="user"
pass="password"
server="server"
Net::FTP.open(server) do |ftp|
    ftp.login(user,pass)
    ftp.nlst("filename.*").each do |file|
        ftp.getbinaryfile(file,file)
    end
    ftp.close
end