A few more pointers on your code.

You don't need to check for existence when incrementing the value of a hash key:

      if(exists $userhash{$username}) {
        $userhash{$username}++;
      }
      else{
        $userhash{$username}=1 ;
      }
[download]

can be written in a single line:

      $userhash{$username}++;
[download]

It's more readable and maintainable to use Quantifiers (see perlre) in a regular expression than using a string of repeated characters or character classes:

So, [0-9][0-9][0-9][0-9] would have been better if written like [0-9]{4} (in that specific instance, \d{4} would have been even better).

When checking for a value that's being incremented or decremented, it's good defensive programming to check not just the terminating value but also all values beyond that. This will often avoid infinite loops.

So, $bigcounter == 100000 would be better as $bigcounter >= 100000 and similarly for $done != 0.

When using open, it's good practice to separate the mode (e.g. '<' for reading, '>>' for appending, etc.) from the file name. It's also good practice to use a lexically scoped filehandle (e.g. my variable) rather than a global. Also, when using or die ... the parentheses are not required - they are if you use || die ....

Putting that all together

open( INPUTDATAFILE, "< $inputfile" ) or die ...
[download]

would become

open my $inputdatafile, '<', $inputfile or die ...
[download]

In closing, I will compliment you on your code in general (neatly laid out, meaningful variable names and so on) - don't stop doing that. :-)

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