Are you trying to do this in Windows or in Unix? If Unix: 
$dirsize = `du -ks /home`;
$dirsize = (split " ", $dirsize)[0];
print "$dirsize\n\n";

[download]
On a Windows system of course it is a different matter.

Update: Thanks John for fleshing out the Windows angle.

In reply to Re: diskspace used by a directory by jlongino
in thread diskspace used by a directory by c

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