Here are some PowerShell tricks that works on Windows.

Add a path to System PATH environment variable.

function AddToPath {
    param (
        [string]$folder
    )

    Write-Host "Adding $folder to environment variables..." -ForegroundColor Yellow

    $currentEnv = [Environment]::GetEnvironmentVariable("Path", [EnvironmentVariableTarget]::Machine).Trim(";");
    $addedEnv = $currentEnv + ";$folder"
    $trimmedEnv = (($addedEnv.Split(';') | Select-Object -Unique) -join ";").Trim(";")
    [Environment]::SetEnvironmentVariable(
        "Path",
        $trimmedEnv,
        [EnvironmentVariableTarget]::Machine)

    $env:Path = [System.Environment]::GetEnvironmentVariable("Path","Machine") + ";" + [System.Environment]::GetEnvironmentVariable("Path","User")
}

Get if is elevated (Administrator)

    $id = [System.Security.Principal.WindowsIdentity]::GetCurrent()
    $p = New-Object System.Security.Principal.WindowsPrincipal($id)
    if ($p.IsInRole([System.Security.Principal.WindowsBuiltInRole]::Administrator))
    { Write-Output $true }      
    else
    { Write-Output $false }

Find current wallpaper (In slides mode)

$bytes=(New-Object -ComObject WScript.Shell).RegRead("HKEY_CURRENT_USER\Control Panel\Desktop\TranscodedImageCache")
$wallpaperpath=[System.Text.Encoding]::Unicode.GetString($bytes[24..($bytes.length-1)])
$wallpaperpath=$wallpaperpath.substring(0, $wallpaperpath.IndexOf("jpg", 0, $wallpaperpath.Length)+3)
Write-Host $wallpaperpath

Set wallpaper to a file

function Set-WallPaper($Image) {
    Add-Type -TypeDefinition @" 
    using System; 
    using System.Runtime.InteropServices;

    public class Params
    { 
        [DllImport("User32.dll",CharSet=CharSet.Unicode)] 
        public static extern int SystemParametersInfo (Int32 uAction, 
                                                       Int32 uParam, 
                                                       String lpvParam, 
                                                       Int32 fuWinIni);
    }
"@ 
    $SPI_SETDESKWALLPAPER = 0x0014
    $UpdateIniFile = 0x01
    $SendChangeEvent = 0x02
    $fWinIni = $UpdateIniFile -bor $SendChangeEvent
    $ret = [Params]::SystemParametersInfo($SPI_SETDESKWALLPAPER, 0, $Image, $fWinIni)
}

Trigger Store to upgrade all apps

$namespaceName = "root\cimv2\mdm\dmmap"
$className = "MDM_EnterpriseModernAppManagement_AppManagement01"
$wmiObj = Get-WmiObject -Namespace $namespaceName -Class $className
$wmiObj.UpdateScanMethod() | Format-Table -AutoSize

Pin a path to quick access

Write-Host "Pin repos to quick access..." -ForegroundColor Green
$load_com = new-object -com shell.application
$load_com.Namespace("$env:USERPROFILE\source\repos").Self.InvokeVerb("pintohome")
$load_com.Namespace("\\VAULT\").Self.InvokeVerb("pintohome")

Recursively searches for items in the user's home directory that start with "." and sets them as hidden.

Write-Host "Set home path hidden folders and files..." -ForegroundColor Green
Get-ChildItem -Path $HOME -Filter .* -Recurse -Force -ErrorAction SilentlyContinue | ForEach-Object { $_.Attributes = $_.Attributes -bor [System.IO.FileAttributes]::Hidden }