How to get process id by its service name with a script to variable

Question

I have service named WinDefend and it runs on process svchost.exe
There other many svchost.exe processes and I need to find a way

Answer 1

Annoying as this is, it requires you to set a unique title for your script if you want the pid for the current process. Then search for that unique title within the list of processes. Thankfully, the Title command allows you to do just that. Also see MagicAndi's response...

Here is my batch file solution:

@ECHO OFF
:SetVars
    SET _Thread=%1
    title=ExecBatch_%_Thread%
    Set /A "_iPID=0"
:Main
    CALL :getPID _iPID %_Thread%
    ...
EXIT /b

::----------------
::---- GetPID ---- 
::----------------
:getPID 
    setlocal   
        set _getPIDcmd=tasklist /v /fo csv 
        for /f "tokens=2 delims=," %%i in ('%_getPIDcmd% ^| findstr /i "ExecBatch_%2"') do (
            echo %%~i
            set _pid=%%~i
        )
    endlocal & Set %~1=%_pid%
exit /b

BTW, I've had the 'pleasure' of doing this time and time again over the years, via API, or batch, or ps. Pick your poison - on a Windows platform it's all the same.

I found an even better way via powershell: $pid returns the current process' process id.