Powershell script to deploy files with necessary backup - powershell

Question

Team,
I'm writing a powershell script to automate one of the manual task we are doing daily. I need expert suggestion and help here as I'm new to powershell scripting.
Requirement:
There is a source, destination and a backup folder.
Source may have diff files and files within multiple folders of source.
eg: source\Login.aspx or source\App_Code\BLogic.vb or source\bin\servr.dll etc.
While copying to destination, my source file has to be checked for existence at destination, if exists then we need to copy the current existing file in destination to backup folder, then copy source to destination.
Below are the scripts that i have tried till now.
Script1:
I'm able to list files which are same but not able to copy those array elements to backup location:
#Declare Source and Destination
$source = Get-ChildItem -Recurse -path \\server1\\e$\ps\src\
$dest = Get-ChildItem -Recurse -path \\server2\\e$\ps\dest\
#lists only objects which are equal and assign to variable
$files=compare-Object -DifferenceObject $source -ReferenceObject $dest -IncludeEqual -ExcludeDifferent
$array = #($files)
$len=$array.length
for ($i=0; $i -lt $array.length; $i++)
{
$array[$i]
}
Script2:
As script1 i was facing problem i tried a silly logic with this script, but i feel this is also having too much manual work :( please help me.
Function cpytest ($s, $d)
{
Copy-Item -Path $s -Destination $d;
}
$n = Read-Host "Enter no of files to be uploaded"
$b = Read-Host "Enter Backup Location for file backups"
for ($i=0;$i -lt $n;$i++)
{
$s = Read-Host "Enter Source with complete file name"
$d = Read-Host "Enter Destination with file name too"
$r = Test-Path $d
If ($r -eq "True")
{
cpytest $d $b
cpytest $s $d
}
Else
{
cpytest $s $d
}
}

Answer 1

Try something like this:
Function BackupAndMoveFile($filePath, $backupPath, $deployPath) {
$fileName = Split-Path $filePath -Leaf
$deployFile = Join-Path $deployPath $fileName
if ((Test-Path $deployFile)) {
$backupFile = Join-Path $backupPath $fileName
Move-Item $deployFile $backupFile -Force
if (!(Test-Path $backupFile)) {
Write-Warning "Can't backup $fileName to $backupFile"
return $false
}
}
Copy-Item $filePath $deployPath -Force
if (!(Test-Path $deployPath)) {
Write-Warning "Can't deploy $fileName to $deployPath"
return $false
}
return $true
}
BackupAndMoveFile 'C:\temp\backup-test.txt' `
'C:\temp\backup' `
'C:\temp\deploy'
It will overwrite anything in the backup directory so you might want to modify to add a timestamp.