If I know the process id (PID) of a process that is (or should be) running (like a script that takes 3 to 5 or more minuts to run), can I use it in a seperate script (like, haveing the process write its PID to a file, and having the other script open the file and read the PID) to check how long that process has been running and/or if it is still running? if so, how?