#bash wait do while waiting for jobs to end

jobs.sh

#!/usr/bin/bash
echo "starting"

sleep 2 &
sleep 4 &
sleep 6 &
sleep 8 &

while true; do
  JOBS=`jobs -p | wc -l`

  # workaround about jobs bug. If don't execute it explicitily,
  # JOBS will stick at 1, even when no jobs are running anymore.
  jobs &>/dev/null

  if [ $JOBS -ne 0 ]; then
    printf "."
  else
    printf "\n"
    break
  fi
done