More untested code: 
while(1){
  `mv /dir/main/* /dir_1`
  sleep(300);

  `mv /dir/main/* /dir_2`
  sleep(300);

  `mv /dir/main/* /dir_3`
  sleep(300);
}

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In reply to Re: sequential file handling (again) by johnny_carlos
in thread sequential file handling (again) by airblaine

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