Hello umaykulsum, one problem I see with your code is that while (<>) shifts (removes) the arguments from @ARGV. So when you are done reading, the size of @ARGV is 0. You can save the count before reading: my $file_count = @ARGV;

Another issue is that single quote prevent interpolation. Try print '\t\s';, you'll see that you don't get a tab and a space, but the string \t\s. You want to use double quotes instead. You either want to split on literal string, like "\t " or use a pattern in a regex like /\t\s/

You can optimize your code by doing more work in one loop (untested): 

while (<>)
{
  chomp;
  my ( $key, $value ) = split /\t\s/, $_; # Edited thanks to Anomalous
+Monk
  $compare{$key}{count}++;
  $compare{$key}{sum} += $value;

  if ($file_count == $compare{$key}{count})
  {
    print "$key: ", $compare{$key}{sum};
  }
}

[download]

Edit: "\t\s" doesn't work, see AnomalousMonk's answer below :)

In reply to Re: count total number of occurrence in all files by Eily
in thread Reaped: count total number of occurrence in all files by NodeReaper

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