A simple process pool in shell script

process-pool.sh

#!/bin/sh

FILENAME="XXX.py"

if [ -z $CORES ]
then
  CORES=3
fi

cnt=0
while true; do
  cnt=$(ps -aux | grep -v "grep" | grep -c "$FILENAME")
  if [ $cnt -lt $CORES ]
  then
    break
  fi
  sleep 1
done

python -W ignore XXX.py $1 $2