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I have a previously running process (process1.sh) that is running in the background with a PID of 1111 (or some other arbitrary number). How could I send something like command option1 option2 to that process with a PID of 1111?
I don’t want to start a new process1.sh!
Named Pipes are your friend. See the article Linux Journal: Using Named Pipes (FIFOs) with Bash.