Batch Script to restart a process if not already running. It runs every 5 seconds

restart.bat

@echo off

:loop
REM Check if the process is already running
tasklist /fi "imagename eq %1" | find /i "%1" > nil
if errorlevel 1 (
  REM If not start the process
  goto :main
) else (
  REM Else keep checking every 5 seconds whether it is alive
  timeout /t 5
  goto :loop
)

:main
if [%2] == [] (
  start /wait %1
) else (
  REM Use this if the process is to be run a s a different user
  runas /profile /user:%2 "CMD /C %1"
)
goto :main

REM Usage example - start /B restart.bat notepad.exe