Uninstall superseded .NET Core SDKs that should no longer be needed

Uninstall-DotnetSuperseded.ps1

#Requires -Version 4.0
#Requires -RunAsAdministrator

[CmdletBinding(SupportsShouldProcess=$true, ConfirmImpact='Medium')]
param (
    [Parameter()]
    [switch] $Force
)

$yesToAll = $false
$noToAll = $false

Get-ChildItem 'Registry::HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Uninstall', 'Registry::HKEY_LOCAL_MACHINE\Software\WOW6432Node\Microsoft\Windows\CurrentVersion\Uninstall' -ErrorAction SilentlyContinue `
    | Get-ItemProperty `
    | Where-Object { $_.SystemComponent -ne 1 -and $_.DisplayName -like '*.NET Core*' -and $_.DisplayName -notlike '*Shared Framework*' -and [Version]$_.DisplayVersion -ge [Version]'2.0' } `
    | Select-Object DisplayName, DisplayVersion, UninstallString, QuietUninstallString, @{l='Version'; e={
        $start = $_.DisplayName.IndexOfAny([char]'0'..[char]'9')
        $end = $_.DisplayName.IndexOfAny([char[]]([char]' ', [char]'-'), $start)

        $version = [Version]$_.DisplayName.Substring($start, $end - $start)
        [Version]::new($version.Major, $version.Minor, $version.Build / 100)
    }} `
    | Group-Object Version `
    | Where-Object Count -gt 1 `
    | Sort-Object Version `
    | ForEach-Object {
        $versions = $_.Group | Sort-Object DisplayVersion -Descending
        $latest, $superseded = $versions[0], $versions[1..$versions.length]

        foreach ($version in $superseded) {
            $caption = "Uninstall '{0}'" -f $version.DisplayName
            $message = "Uninstall '{0}' superseded by '{1}'" -f $version.DisplayName, $latest.DisplayName

            if ($PSCmdlet.ShouldProcess($message, "$message?", $caption)) {
                if ($Force -or $PSCmdlet.ShouldContinue("$message?", $caption, [ref] $script:yesToAll, [ref] $script:noToAll)) {
                    $command = $version.QuietUninstallString
                    if (!$command) {
                        $command = $version.UninstallString
                    }

                    Start-Process -NoNewWindow -Wait -FilePath 'cmd.exe' -ArgumentList "/c $command"
                }
            }
        }
    }