I bet that here

 print `cat /etc/mail/aliases | grep $_`;
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you want to say:

 print `cat /etc/mail/aliases | grep "$_"`;
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or

 print `cat /etc/mail/aliases | grep '$_'`;
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And I daresay you're having some quirky user/dir-names :-) (spaces would suffice to break the grep-call) To be sure you should supply the list of subdirectory-names your greping for.

hth
regards,
tomte

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