#!/bin/sh
total_tasks=600
i=0
while [ $i -lt $total_tasks ]
do
./dowhile &
i=`expr $i + 1`
done

num_dowhile=$(ps ax | grep dowhile$ | wc -l)
while [ $num_dowhile -ne $total_tasks ] ;
do
    sleep 1
    num_dowhile=$(ps ax | grep dowhile$ | wc -l)
done