Start or stop all my nirvana services

StartStopNirvanaServices.ps1

function Stop-Nirvana{
    Get-Service | 
        Where {($_.Name -like "*nirvana*") -and ($_.Status -ne "Stopped")} |
        Stop-Service
}

function Start-Nirvana{
    Get-Service | 
        Where {($_.Name -like "*nirvana*") -and ($_.Status -eq "Stopped")} |
        Start-Service
}