Can't detach child process when main process is started from systemd

Question

I want to spawn long-running child processes that survive when the main process restarts/dies. This works fine when running from the terminal:

$ cat exectest         


        

Answer 1

If you cannot (like me) to change the KillMode of the service for some reason, you could try the at command (see man).

You can schedule your command to run 1 minute ahead. See an example:

# this will remove all .tmp files from "/path/" in 1 minute ahead (this task will run once)
echo rm /path/*.tmp | at now + 1 minute