Environment operation for powershell

profile.ps1

function setenv($key, $value, $target) {
  if (! $target) {
    $target = "User"
  }
  if (($target -eq "Process") -Or ($target -eq "User") -Or ($target -eq "Machine")) {
    $now = [environment]::getEnvironmentVariable($key, $target)
    if ($now) {
      $tChoiceDescription = "System.Management.Automation.Host.ChoiceDescription"
      $result = $host.ui.PromptForChoice("", "Already Exists. Overwrite ?", @(
        New-Object $tChoiceDescription ("&Yes")
        New-Object $tChoiceDescription ("&No")
      ), 1)
      switch ($result) {
        0 {break}
        1 {
          Write-Host "`r`nAborted." -ForegroundColor DarkRed
          return
        }
      }
    }
    [environment]::setEnvironmentVariable($key, $value, $target)
    [environment]::setEnvironmentVariable($key, $value, "Process")
  } else {
    Write-Host "Failure ! - Invalid Target" -ForegroundColor DarkYellow
  }
}
function setpath($value, $target) {
  if (! $target) {
    $target = "User"
  }
  if (($target -eq "Process") -Or ($target -eq "User") -Or ($target -eq "Machine")) {
    $item = Convert-Path $value

    $path = [environment]::getEnvironmentVariable("PATH", $target)
    $list = $path -split ";"

    if (! $list.Contains($item)) {
      $_path = $path + ";" + $item + ";"
      $newpath = $_path -replace ";;", ";"
      [environment]::setEnvironmentVariable("PATH", $newpath, $target)

      $_path = [environment]::getEnvironmentVariable("PATH", "Process") + ";" + $item + ";"
      $newpath = $_path -replace ";;", ";"
      [environment]::setEnvironmentVariable("PATH", $newpath, "Process")
    } else {
      Write-Host "Already Exists." -ForegroundColor DarkYellow
    }
  } else {
    Write-Host "Failure ! - Invalid Target" -ForegroundColor DarkRed
  }
}