Clean up Jenkins Build history

Clear-JenkinsBuildHistory.ps1

$BuildDirs = gci "W:\Jenkins\jobs\" -recurse -filter builds | ?{$_.psiscontainer}
$BuildDirs | %{
    $Builds = $_ | gci | select *,@{L="NameInt";e={[int]$_.name}} | ?{$_.nameint}|  sort  nameint -Descending
    if($builds.Length -gt 30){
        $Builds[30..$($builds.length-1)].fullname | Remove-Item -Force -Recurse -verbose
    }else{
        $Builds.Length
    }
}