This is not need - you have it
Windows:
create - cron.bat: ADD
@echo off
php.exe -f "D:\InetPub\wwwroot\web\phpdig\admin\spider.php"
http://www.my_domain_1.com
php.exe -f "D:\InetPub\wwwroot\web\phpdig\admin\spider.php"
http://www.my_domain_2.com
php.exe -f "D:\InetPub\wwwroot\web\phpdig\admin\spider.php"
http://www.my_domain_3.com
php.exe -f "D:\InetPub\wwwroot\web\phpdig\admin\spider.php"
http://www.my_domain_4.com
php.exe -f "D:\InetPub\wwwroot\web\phpdig\admin\spider.php"
http://www.my_domain_5.com
php.exe -f "D:\InetPub\wwwroot\web\phpdig\admin\spider.php"
http://www.my_domain_6.com
D:\InetPub\wwwroot\web\phpdig is path to phpdig.
Start this with Settings -> Taskmanger at time you want.
Similar under Linux.