SFTP命令汇总
                  cd 路径                        更改到远程目录的路径
                  lcd 路径                       更改到本地目录的路径
                  chgrp group path               将文件path的组更改为group
                  chmod mode path                将文件path的权限更改为mode
                  chown owner path               将文件path的属主更改为owner
                  exit                           退出 sftp
                  help                           显示这个帮助文本
                  get 远程路径                   下载文件
                  ln existingpath linkpath       符号链接远程文件
                  ls [选项] [路径]               显示远程目录列表
                  lls [选项] [路径]              显示本地目录列表
                  mkdir 路径                     创建远程目录
                  lmkdir 路径                    创建本地目录
                  mv oldpath newpath             移动远程文件
                  open [用户@]主机[:端口]        连接到远程主机
                  put 本地路径                   上传文件
                  pwd                            显示远程工作目录
                  lpwd                           打印本地工作目录
                  quit                           退出 sftp
                  rmdir 路径                     移除远程目录
                  lrmdir 路径                    移除本地目录
                  rm 路径                        删除远程文件
                  lrm 路径                       删除本地文件
                  symlink existingpath linkpath  符号链接远程文件
                  version                        显示协议版本