Mark Funk asked:
  
  > What exactly does the following Perl code do?
  > 
  > %hash=();
  > 
  > open(PREVFILE, $prevfile) or die("Unable to open previous file");
  > 
  > while(<PREVFILE>) {
  >   chomp;
  >   last if /BREAK/;
  >   $seen{$_}++;
  > }
  > close(PREVFILE);
 
  Exactly, the code does nothing (since there is no output).  I
  suspect the intent is to count the number of times each line of
  the file $prevfile occurs;  but if $prevfile has a line which is
  just "BREAK" then only lines above that line are considered
  (otherwise all lines are considered).

  --Suresh

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