How to suppress Terminated message after killing in bash?

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In order to silence the message, you must be redirecting stderr at the time the message is generated. Because the kill command sends a signal and doesn’t wait for the target process to respond, redirecting stderr of the kill command does you no good. The bash builtin wait was made specifically for this purpose.

Here is very simple example that kills the most recent background command. (Learn more about $! here.)

kill $!
wait $! 2>/dev/null

Because both kill and wait accept multiple pids, you can also do batch kills. Here is an example that kills all background processes (of the current process/script of course).

kill $(jobs -rp)
wait $(jobs -rp) 2>/dev/null

I was led here from bash: silently kill background function process.

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