print "Enter the number in the first batch file:\n";

$f=<STDIN>;

print "Enter the number in the last batch file:\n";

$l=<STDIN>;

for ($i=$f;$i<=$l; $i++)

  { 
    
     $t="file";  
     $concatfile=$t and $i;     
     $file="$concatfile.bat";
     system($file);
     sleep(2);


  }