> I want the perl script to generate different file names
  > whenever it is called. 

  How about using the time:

  my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst) = localtime(time);
     $year += 1900;
     $mon  += 1;

     $file = sprintf("%s%4.4d_%2.2d_%2.2d_%2.2d_%2.2d_%2.2d.txt", $some_string, 
$year, $mon, $mday, $hour, $min, $sec);

  --Suresh

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