How to determine pid of process started via os.system

Question

I want to start several subprocesses with a programm, i.e. a module foo.py starts several instances of bar.py.

Since I sometimes have to te

Answer 1

Sharing my solution in case it can help others:

I took the info from this page to run a fortran exe in the background. I tried to use os.forkpty to get the pid of it, but it didnt give the pid of my process. I cant use subprocess, because I didnt find out how it would let me run my process on the background.

With help of a colleague I found this:

exec_cmd = 'nohup ./FPEXE & echo $! > /tmp/pid'

os.system(exec_cmd)

In case of wanting to append pids to the same file, use double arrow.