for($i = 0;$i -le 30;$i++) {
    if (Test-Path "$i") {
        Remove-Item "$i" -Recurse
    }
    New-Item -Path "./" -Name "$i" -ItemType directory
    Set-Location "$i"
    if (Test-Path "$i.txt") {
        Remove-Item "$i.txt"
    }
    for($line = 0;$line -le 50;$line++) {
        Add-Content -Path "$i.txt" -Value ("{0}---{1}---{2}{3}---{4}" -F (Get-Random -Minimum 1000 -Maximum 32768),
                               (Get-Random -Minimum 1000 -Maximum 32768),
                               (Get-Random -Minimum 1000 -Maximum 32768),
                               (Get-Random -Minimum 1000 -Maximum 32768),
                               (Get-Random -Minimum 1000 -Maximum 32768))
    }
    Set-Location ".."
}