Windows powershell Get-Process: get parentprocess ID / name, get process using port...

Powershell command to get parent processes of all processes with a given name (e. g. javaw.exe):

Get-CimInstance Win32_Process -Filter "Name = 'javaw.exe'" | select ParentProcessId

Or in a script. This one takes the process name as a parameter and also shows the , this time with the parent process name: 

$targetProcessName = $args[0]

$targetProcessName = $args[0]
$targetProcesses = Get-CimInstance -ClassName Win32_Process -Filter "Name = '$targetProcessName'"

foreach ($process in $targetProcesses) {
    $parentProcessId = $process.ParentProcessId
    $parentProcess = Get-CimInstance -ClassName Win32_Process -Filter "ProcessId = $parentProcessId"
    Write-Output "Process: $($process.processId) $($process.Name), Parent Process: $($ParentProcessId)    $($parentProcess.Name)"
}

Powershell command to get ID of process occupying a port (e.g. 8080)

 Get-Process -Id (Get-NetTCPConnection -LocalPort 8080).OwningProcess

 Once you have the id you can shoot it using 

taskkill /PID <processid> /F