I'm trying to write a quick-and-dirty shell script daemon to run on a home router that has a busybox shell, which doesn't support disown. Is there any way to do either of the following?
command & and then disown it once it's in the background.&).Since you're the one writing a quick and dirty daemon: let it fork off into the background and let the starting process exit immediately after forking, like any other daemon might.
This sounds like an X Y problem.
Busybox is a very primitive shell, it doesn't support disown.
But why do you want to disown anyway? It's already in the background, and if you exit the shell, busybox isn't going to kill it. The only point of disown is to remove the process from the shell's list of things it is monitoring.
Somebody already said this in a comment, but see Detach a process from Sh (not Bash) or “disown” for Sh (not Bash)
TLDR: use nohup command > /dev/null 2>&1 &
