#!/bin/bash

runOne() {
# Create a main process group running "echo -n ''",
# and a "deadman timer" process group that waits 60 seconds and
# then kills the main process group.
# If the main process group ends before the timer process
# group, the timer process group is killed.

  # create a new process group so that the main job
  # and all of the its descendant processes can be terminated
  # as a whole
  perl -e 'setpgrp(0,0);exec(@ARGV)' bash -c "echo -n ''" &    # spawn main job
  local pidMain=$!   # pid of main job
  perl -e 'setpgrp(0,0);exec(@ARGV)' bash -c "sleep 60; /usr/bin/kill -9 -$pidMain" & # spawn timer job
  local pidTimer=$!  # pid of timer job
  wait $pidMain      # wait until main job finishes
                     # either normally or through the timer
  /usr/bin/kill -9 -$pidTimer # kill the timer job
}

for i in 1 2 3 4 5 6 7 8 9 10; do
  runOne
  runOne
  runOne
  runOne
  runOne
done
exit 0