Question

I have created a bash script and it runs in the background. It has a PID which is stored in a file, and I can use KILL to pass predefined signals to the process.

From time to time however, I’d like to pass information to the process manually. Preferably what I would like to happen is to be able to pass a string or array of information, which is captured through TRAP, then the forever loop inside the bash file will process the information. Is there an easy way to pass information into a background process?

Thanks

Answer 1

You can create a fifo, have the main process write to it and have the child read from it.

mkfifo link
run_sub < link &
generate_output > link