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Bash - forward SIGTERM to child precesses

3 points
Created by:
Root-ssh
85720

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┬áthe end of the /path/to/script_or_program_N runs script or┬áprogram in background, letting to get run process PID using┬á$!,
  • kill -TERM forwards┬áSIGTERM into child process,
  • wait blocks current script during process is run.
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