timeout_pg

#!/bin/bash
#

help() {
  echo "usage: timeout_pg seconds [--pg] command [parameters]*"
  echo
  echo "    Run command and send SIGTERM to it after given seconds."
  echo
  echo "    --pg - send kill to the command's process group and"
  echo "           thus kill the command and all of its children"
  echo
  exit 0
}

[ "$1" == "--help" ] && help

SLEEP=$1; shift
[ "$1" == "--pg" ] && KILL_PGID=true && shift

# https://stackoverflow.com/questions/4339756/inside-a-bash-script-how-to-get-pid-from-a-program-executed-when-using-the-eval
# https://unix.stackexchange.com/questions/14815/process-descendants

set -m # enable monitoring mode for subshells -> procs get new PGID!
eval "$@ &"
set +m
PID="$!"
sleep $SLEEP

if [ "$KILL_PGID" == "true" ]; then
  PGID=$( ps --no-headers -q "$PID" -o pgid | tr -d ' ' )
  kill -TERM -$PGID &>/dev/null
else
  kill -TERM   $PID &>/dev/null
fi