对于参数的详细的解释
cmds_allowed=ABOR,ACCT,APPE,CWD,CDUP,DELE,HELP,LIST,MODE,MDTM,MKD,NOOP,NLST,PASS,PASV,PORT,PWD,QUIT,REIN,RETR,RMD,RNFR,RNTO,SITE,SIZE,STOR,STAT,STOU,STRU,SYST,TYPE,USER
# ABOR - abort a file transfer 取消文件传输# ACCT* - send account information 发送帐户信息# APPE - append to a remote file 附加到远程文件# AUTH - 权限# CDUP - CWD to the parent of the current directory CWD到当前目录的父# CWD - change working directory 更改目录# DELE - delete a remote file 删除文件# EPRT -# EPSV -# PEAT -# HELP - return help on using the server 帮助使用服务器# LANG -# LIST - list remote files 列目录# MD5 -# MDTM - return the modification time of a file 返回文件的更新时间# MFMT -# MKD - make a remote directory 新建文件夹# MLSD -# MLST -# MODE - set transfer mode 设置传输模式# MODE -# NLST - name list of remote directory 远程目录的名称列表# NOOP - do nothing 什么都不做# OPTS -# PASS - send password 发送密码# PASV - enter passive mode 进入被动模式# PBSZ -# PORT - open a data port 打开一个传输端口# PROT -# PWD - print working directory 显示当前工作目录# QUIT - terminate the connection 退出# REIN* - reinitialize the connection 重新初始化连接# REST -# RETR - retrieve a remote file 下载文件# RMD - remove a remote directory 删除目录# RNFR - rename from 重命名# RNTO - rename to 重命名# SITE - site-specific commands 特定于站点的命令# SIZE - return the size of a file 返回文件大小# STAT - return server status 服务器状态# STOR - store a file on the remote host 上传文件# STOU - store a file uniquely 唯一地存储文件# STRU - set file transfer structure 设置文件传输格式# STRU -# SYST - return system type# TYPE - set transfer type 设置传输类型# USER - send username
