worker.sh

#!/bin/sh

script="index.php cli worker"
folder="/script_path/"
max_worker="5"
php_bin="/usr/bin/php"
count=0
current_count=$(ps aux | grep "index.php cli worker" | grep -v "grep" | wc -l)

if test $current_count -lt $max_worker
then
    cd $folder
    $php_bin $folder$script &
else
    echo "The worker count has been limited."
fi