starts multiple processes and checks every second if each of them are alive, exiting the parent when any of the children exit

startAndExitOnAnyChildExit.sh

#!/bin/bash

function startChildProcesses
{
	for cmd in "$@"; do {
	  $cmd & pid=$!
	  echo "Process \"$cmd\" started with pid $pid";
	  PID_LIST+=" $pid";
	} done

	PID_ARRAY=($PID_LIST)
}

function signalChildren {
  for var in "${PID_ARRAY[@]}"
	do
		if ps -p $var > /dev/null
		then
		  echo "sending $1 to $var"
		  kill -s $1 $var
		fi
	done
}

function exitAllOnAnyChildExit
{
	while :
	do
	    for var in "${PID_ARRAY[@]}"
		do
		  	if ps -p $var > /dev/null
			then
			   :
			else
			   echo "child process $var exited, killing all children and exiting"
			   signalChildren TERM
			   sleep 2
			   signalChildren KILL
			   exit 0
			fi	
		done
		sleep 1
	done	
}

startChildProcesses "$@"
exitAllOnAnyChildExit