Bash watch command for PowerShell

watch.ps1

function watch {
  $Command = "$args"
  $Seconds = 2

  if ($args.Length -gt 2 -and $args[0] -eq "-n") {
    $Seconds = [int]$args[1]
    $Command = $args[2..$args.Length]
  }

  if ($Command -eq "") {
    Write-Host "Usage: watch [-n <sec>] <command>"
    return
  }

  while(1) {
    Invoke-Expression "`$result = $Command" 2>&1
    Clear-Host
    Write-Output "$(Get-Date) : $Command"
    Write-Output ""
    Write-Output $result
    Start-Sleep $Seconds
  }
}