[Powershell] FTP Download File

 # Config
 $today = Get-Date -UFormat "%Y%m%d"
 $LogFilePath = "d:\ftpLog_$today.txt"
 $UserName = "ftpuser"
 $Password = "Password01!"

 function REM($Msg){
     $now= Get-Date
     write-host "$now : $Msg" -foregroundcolor Yellow
     Add-Content $LogFilePath "$now : $Msg"
 }

 function DownloadFile($Username,$Password,$RemoteFile,$LocalFile){

     try
     {
         $ErrorActionPreference="Stop";

         if($RemoteFile -eq $null){
             REM "RemoteFile is null"
             return
         }
         if($LocalFile -eq $null){
             REM "LocalFile is null"
             return
         }

         $FTPRequest = [System.Net.FtpWebRequest]::Create($RemoteFile)
         $FTPRequest.Credentials = New-Object System.Net.NetworkCredential($Username,$Password)
         $FTPRequest.Method = [System.Net.WebRequestMethods+Ftp]::DownloadFile
         $FTPRequest.UseBinary = $true
         $FTPRequest.KeepAlive = $false
         # Send the ftp request
         $FTPResponse = $FTPRequest.GetResponse()
         # Get a download stream from the server response
         $ResponseStream = $FTPResponse.GetResponseStream()
         # Create the target file on the local system and the download buffer
         $LocalFileFile = New-Object IO.FileStream ($LocalFile,[IO.FileMode]::Create)
         [byte[]]$ReadBuffer = New-Object byte[] 1024
         if($ResponseStream -eq $null){
             return
         }
         # Loop through the download
         do {
             $ReadLength = $ResponseStream.Read($ReadBuffer,0,1024)
             $LocalFileFile.Write($ReadBuffer,0,$ReadLength) 

         }
         while ($ReadLength -ne 0)

         REM "$RemoteFile 下载成功。"
     }
     catch
     {
         REM("Exception Msg: $_")
     }

 }

 DownloadFile $UserName $Password "ftp://192.168.1.103/frate.csv" "c:\downloads\frate.csv"
 DownloadFile $UserName $Password "ftp://192.168.1.103/bcirfp.csv" "c:\downloads\bcirfp.csv" 

连接Linux机器上的ftp时候，切记文件名是区分大小写滴！