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Bash - forward SIGTERM to child processes

3 points
Created by:
Root-ssh
121260

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.

Bash

Bash - forward SIGTERM to child processes
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