Remove-OldIISLogs.ps1

$MaxLogAge = 31
$LogFilesDirectory = 'C:\inetpub\logs\LogFiles\'

$ErrorActionPreference = 'SilentlyContinue'

if ($LogFilesDirectory) {
    Set-Location $LogFilesDirectory
 
    # For all directories that start with "W3SVC" run the following
    foreach ($LogDirectory in Get-ChildItem $LogFilesDirectory | Where-Object { $_.PsIsContainer -and $_.Name -match '^W3SVC' }) {
        $WorkingDirectory = Join-Path $LogFilesDirectory $LogDirectory
        Set-Location $WorkingDirectory
 
        # Delete IIS logs older than $MaxLogAge days
        Get-ChildItem $WorkingDirectory | Where-Object { $_.lastWriteTime -lt (Get-Date).AddDays(-$MaxLogAge) } | Remove-Item -Force
 
        # Compress IIS logs older than 1 day that aren't already compressed
        foreach ($Log in Get-ChildItem $WorkingDirectory | Where-Object { $_.lastWriteTime -lt (Get-Date).AddDays(-1) -and $_.Attributes -notcontains 'Compressed' }) {
            $File = Join-Path $WorkingDirectory $Log.Name
            $TempCmd = 'Compact /C ' + $File
            Invoke-Expression -Command $TempCmd
        }
    }
}