perl directory size not reporting the correct size

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I need to determine the mail size to enforce quotas from perl. When I do du -bs /var/spool/mail/smith from the command line I get a correct number. But when I do the same command from perl (below) I always get 4096. I tried hard-coding the user (replacing $recipientUser) to be sure with same result. Selinux is not a factor. There are no errors in the logs.

if ($mailboxSize = `du -bs /var/spool/mail/$recipientUser`) {

I don't think there is an equivalent command in perl to get a directory size, so how do I do it ? Thanks in advance.

asked 19 secs ago

Xi Vix

315

perl directory size not reporting the correct size