Append data to a CSV file on an FTP server using PowerShell - powershell

Question

I am trying to append data to a CSV file on an FTP server using PowerShell.
Currently my script works fine, however it is overwriting the data.
Here is the main bit of my code:
$webclient = New-Object System.Net.WebClient
$webclient.Credentials = New-Object System.Net.NetworkCredential($user,$pass)
$UserInfo = [pscustomobject]#{
UserName = $env:UserName
ComputerName = $env:computername
}
$contents =
(($UserInfo | ConvertTo-Csv -NoTypeInformation) -join [Environment]::NewLine) +
[Environment]::NewLine
$webclient.UploadString(($ftp + "/Installed.csv"), $contents)
Ideally, I'd like to do this without any native plugins or libraries. The only other thing I can think of is using something like get-content to get the current data from the file, and then the new data would be
getcontent myfile.csv + the new data from $UserInfo
Basically I am installing a VPN through group policy and would like to log who successfully installed the client. We don't have any software distribution platforms unfortunately so we're trying to use GP and FTP to perform this task.
Any suggestions are appreciated. Thank you in advance.

Answer 1

It's not possible with WebClient. But it can be done with FtpWebRequest and WebRequestMethods.Ftp.AppendFile.
$request = [System.Net.WebRequest]::Create("ftp://example.com/remote/path/file.txt")
$request.Credentials = New-Object System.Net.NetworkCredential("username", "password")
$request.Method = [System.Net.WebRequestMethods+Ftp]::AppendFile
$ftpStream = $request.GetRequestStream()
$writer = New-Object System.IO.StreamWriter($ftpStream)
$writer.Write($contents)
$writer.Close()
$ftpStream.Dispose()