So long as you're not running with root permissions the underlying unlink(2) should fail with EPERM (per POSIX) if you try and unlink a directory. 

$ perl -le 'mkdir "OHNOEZ"; unlink "OHNOEZ" or die "unlink: $!\n";rmdi
+r "OHNOEZ"'
unlink: Operation not permitted

[download]

Your system's rm command's going to be making the same underlying unlink(2) call for the same arguments for that matter; so long as you're not running as root it's a rather spurious thing to worry about.

The cake is a lie.
The cake is a lie.
The cake is a lie.

In reply to Re^3: Need help with loops and 3 tables by Fletch
in thread Need help with loops and 3 tables by htmanning

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