What's the best way to automate secure FTP in

Question

I'd like to automate the FTP download of a database backup file using PowerShell. The file name includes the date so I can't just run the same FTP script every day. Is there a clean way to do this built into PowerShell or using the .Net framework?

UPDATE I forgot to mention that this is a through a secure FTP session.

Answer 1

Something like this could work:

$bkdir = "E:\BackupsPWS" #backups location directory
$7Zip = 'C:\"Program Files"\7-Zip\7z.exe' #compression utility
$files_to_transfer = New-Object System.Collections.ArrayList #list of zipped files to be   transferred over FTP
$ftp_uri="myftpserver"
$user="myftpusername"
$pass="myftppassword"

#find .bak files not zipped yet, zip them, add them to the list to be transferrd
get-childitem -path $bkdir | Sort-Object length |
where { $_.extension -match ".(bak)" -and
-not (test-path ($_.fullname -replace "(bak)", "7z")) } |
foreach {
$zipfilename = ($_.fullname -replace "bak", "7z")
Invoke-Expression "$7Zip a $zipfilename $($_.FullName)"
$files_to_transfer.Add($zipfilename)
}

#find .bak files, if they've been zipped, delete the .bak file
get-childitem -path $bkdir |
where { $_.extension -match ".(bak)" -and
(test-path ($_.fullname -replace "(bak)", "7z")) } |
foreach { del $_.fullname }

#transfer each zipped file over FTP
foreach ($file in $files_to_transfer)
{
$webclient = New-Object System.Net.WebClient
$webclient.Credentials = New-Object System.Net.NetworkCredential($user,$pass) # FTP credentials
$ftp_urix = $ftp_uri + "/" + $file.Substring($bkdir.Length + 1) # ftp address where to transfer   the file
$uri=[system.URI] $ftp_urix
$webclient.UploadFile($uri, $file) #transfer the file
}

Check this: Powershell: compress backups and FTP transfer

Answer 2

Taken from here

$source = "ftp://ftp.microsoft.com/ResKit/win2000/dureg.zip"
$target = "c:\temp\dureg.zip"
$WebClient = New-Object System.Net.WebClient
$WebClient.DownloadFile($source, $target)

Works for me