A common misperception is that a file "exists within a directory". No!
That's a whole lot of BS. Stop pretending that directory entries aren't called files.
unlink: "Deletes a list of files"
rm: "Remove files or directories"
You're trying to correct the OP's terminology, yet he's using the same terminology as Perl and GNU.
Are you posting in the right place? Check out Where do I post X? to know for sure.
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Want more info? How to link or
or How to display code and escape characters
are good places to start.