copy files if modified

Question

hi,

I'm scripting newbie I would need, for a project, to be able to have "online" the last 4 versions of some files ..

given the "parent" folder that contains them, I would like to copy the modified files, in sequence, to the Ver1, Ver2, Ver3, Ver4 folders

how can I proceed?

Answer 1

See if this works for you.

$SourceFolder = 'C:\Temp\test'
$BackupFolder = 'C:\Temp\test\Bkup'
$versions = 3
cls
# insure that all of our version folders exist 
for ($i = 1; $i -le $versions; $i++) {
    $vf = $BackupFolder + "\Ver" + $i
    if ((Test-Path $vf) -eq $false) {
        "Creating $vf" 
        $z = New-Item -Path $vf -ItemType Directory 
    }  
}
# Analyze files in source folder 
$files = Get-ChildItem $SourceFolder -Filter '*.txt' -File      # this sample code looks at txt files 
foreach ($f in $files) {
    "Processing {0}" -f $f.name
    # Let's see if we have a backup of this version 
    $v1 =  $BackupFolder + "\Ver1\" + $f.Name 
    $v1f = Get-Item $v1 -ErrorAction SilentlyContinue
    if ($v1f.LastWriteTime -ne $f.LastWriteTime) {     # is the ver1 file the same timestamp as the source file? 
        " Need to backup this file."
        for ($i = $versions -1; $i -gt 0; $i--)  {      # move ver3 to ver4, then ver2 to ver3, etc. 
            $src = $BackupFolder + "\Ver" + $i + "\" + $f.name 
            $dst =  $BackupFolder + "\Ver" + ($i + 1) + "\"
            try {
                " Move $src to $dst" 
                move-item  $src -Destination  $dst -Force -ErrorAction Stop
                " Success."
            } catch {
                " No backup version in $src" 
            }
        } 
        Copy-Item $f.FullName -Destination $v1           # finally backup the modified file to ver1 folder.     
        " Copied to $v1"
    }  
}

    

Answer 2

Thank you!

it's what I needed, and from what I could try it works :-)