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#Requires -RunAsAdministrator
# Disables certificate CRL checking on Windows Server 2008 R2 
# More info here: http://blogs.msdn.com/b/chaun/archive/2014/05/01/best-practices-for-crl-checking-on-sharepoint-servers.aspx 
$HKEYUSERS = get-childitem $(Resolve-Path Registry::HKEY_USERS\) 

foreach ($userKey in $HKEYUSERS) {
    $RegPath = $userKey.PSPath
    $RegPath = $RegPath + "\Software\Microsoft\Windows\CurrentVersion\WinTrust\Trust Providers\Software Publishing\"
    
    if ($(Test-Path $RegPath)) {

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Get-ItemProperty HKLM:\Software\Microsoft\Windows\CurrentVersion\Uninstall\* |  Select-Object DisplayName, DisplayVersion, Publisher, InstallDate | Format-Table –AutoSize

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Get-WmiObject Win32_PnPSignedDriver | Select-Object DeviceName, DriverVersion

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#Requires -RunAsAdministrator
# Disables IE WPAD on Windows Server 2008 R2 
$HKEYUSERS = get-childitem $(Resolve-Path Registry::HKEY_USERS\) 

foreach ($userKey in $HKEYUSERS) {
    $RegPath = $userKey.PSPath
    $RegPath = $RegPath + "\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Connections\"
    
    if ($(Test-Path $RegPath)) {
        $wpadSetting = (Get-ItemProperty -LiteralPath $RegPath).DefaultConnectionSettings 

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# Set Sharepoint DeveloperDashboard DisplayLevel to On
$DeveloperDashboard = [Microsoft.SharePoint.Administration.SPWebService]::ContentService.DeveloperDashboardSettings
$DeveloperDashboard.DisplayLevel = 'On'
$DeveloperDashboard.TraceEnabled = $true
$DeveloperDashboard.Update()

# Turn off Sharepoint DeveloperDashboard 
$DeveloperDashboard = [Microsoft.SharePoint.Administration.SPWebService]::ContentService.DeveloperDashboardSettings
$DeveloperDashboard.DisplayLevel = 'Off'
$DeveloperDashboard.TraceEnabled = $False

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$msiPackageToInstall = "<path to .msi>"
# save log from installation to temp file 
$tmpFile = [System.IO.Path]::GetTempFileName()
Start-Process msiexec -ArgumentList "/i $msiPackageToInstall /qn /L*v $tmpFile" -NoNewWindow -Wait

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Get-Command -All | Select-Object Name, CommandType, ModuleName, PSSnapIn, HelpUri 

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# Use the method .tostring("P"), for example:
$a =  [math]::PI 
$b =  [math]::E  
($a/$a).tostring("P") 

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function Get-LastBootTime {
    # returns last boot time and date as System.DateTime
    (Get-Date) - $([timespan]::FromMilliseconds([Environment]::TickCount ) )
}

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$dirSize = (Get-ChildItem -file -Recurse | Measure-Object length -sum).sum/1mb
$dirSize = [math]::Round($dirSize)
Write-Output "$(Get-Location):   $dirSize Mb"