shell lancement number shifting

#!/bin/bash

level=$1
solution=$2
cpu_count=$3

level_number=`cat number_level.txt`

if [[ ! -f $level ]]; then
  echo "level missing!"
  exit 255
fi

>$solution
>process_list.txt

# echo "Lauching $cpu_count process ids to solve level $level_number:"
for i in $(seq 1 $cpu_count); do
  python number_shifting_offline_new.py <$level >>$solution &
  tab[$i]=$!
  echo ${tab[$i]} >>process_list.txt
done

# cat process_list.txt | xargs echo

while true; do
  if [[ -s $solution ]]; then
    echo "Solution found! Killing other processes..."
    for i in $(seq 1 $cpu_count); do
      kill ${tab[$i]} 2>/dev/null
    done
    exit 0
  fi
done