log_file_archive.ps1

# Script that archives the .log files in the current directory that are from last month into a file that contains the month/year

$7Zip = 'C:\"Program Files"\7-Zip\7z.exe'
$firstDayOfMonth = (Get-Date (Get-Date) -Day 1 -Hour 0 -Minute 0 -Second 0)
Write-Host ("First Day of THIS month is: " + $firstDayOfMonth)
$lastDayOfLastMonth = $firstDayOfMonth.AddSeconds(-1)
Write-Host ("Last Day of LAST month is: " + $lastDayOfLastMonth)
$outputFileName = [string]::Format("Logs_{0}-{1}.zip", $lastDayOfLastMonth.Year, $lastDayOfLastMonth.Month.ToString("00"))

$logFiles = Get-ChildItem | Where-Object { $_.Extension -match ".(log)" -and $_.LastWriteTime -lt $firstDayOfMonth }
foreach ($logFile in $logFiles) {
    Write-Host ("Adding " + $logFile.FullName + " to " + $outputFileName)
    $logFilePath = ($logFile.FullName)
    Invoke-Expression "$7Zip a $outputFileName $logFilePath -sdel -mmt"
}