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Bash - forward SIGTERM to child processes

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Created by:

177650

In this short article we would like to show how to run multiple programs as child of main script and forward TERM SIGNAL to them when occurs.

Quick solution:

#!/bin/bash

terminate() { 
    kill -TERM "$child_1" 2> /dev/null
    kill -TERM "$child_2" 2> /dev/null
}

trap terminate SIGTERM

/path/to/script_or_program_1 &
child_1=$!

/path/to/script_or_program_2 &
child_2=$!

wait "$child_1"
wait "$child_2"

Where:

terminate function is called when SIGTERM occurs,
& at the end of the /path/to/script_or_program_N runs script or program in background, letting to get run process PID using $!,
kill -TERM forwards SIGTERM into child process,
wait blocks current script during process is run.

Alternative titles

Bash - send ctrl+c to child precesses

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