Please see Writeup Formatting Tips (especially the part about using <CODE> tags around your code).

Did you paste this code exactly as it exists on your machine? There are a couple of syntax errors: 
while () {

[download]
should be: 
while (<USERS>) {

[download]
Also, a shortcut for using temp variables (or undefs), instead of 
  $j, $j, $j, $j, $j, $month, $date, $time, $uname) = split;

[download]
(which needs a leading parenthesis, btw), use an array slice to extract only the values you need: 
  ($month, $date, $time, $uname) = (split)[5..8];

[download]
--sacked

In reply to (sacked) Re: DiskUsage.pl by sacked
in thread DiskUsage.pl by JSchmitz

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