Can't see anything obvious. Doubt your problem is related to unlink. Putting more tracing in your code listing all files in the foreach loop (before and after the -M test) should clarify what is going on.

Be aware that there are some significant differences in unlink semantics between Unix and Windows:

In reply to Re: Unlink works in windows, not in Linux? by eyepopslikeamosquito
in thread Unlink works in windows, not in Linux? by jagexCoder

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