progress() {
  _bar=$1; _bar=${_bar:=.}
  while :
  do
    jobs %1 > /dev/null 2>&1
    [ $? = 0 ] || break
    echo -n ${_bar}
    sleep 0.1
  done;
}

usage() {
  echo "usage:$0 [command]"; exit;
}

[ $# = 0 ] && usage

"$@" &
progress