remote-process-control.sh

#!/bin/bash
init=true
function do_stuff () {
  while :; do
    echo -n .
    sleep .5
  done
}
while :; do
  if [ "$(nc -l 9999)" = "on" ]; then
  if ! kill -0 $pid 2>/dev/null || $init; then
    init=false
    do_stuff &
    pid=$!
  fi
  else
    kill $pid 2>/dev/null
    wait 2>/dev/null
  fi
done