Unfortunately, $! is garbage in that example.

From unlink:

Deletes a list of files. On success, it returns the number of files it successfully deleted. On failure, it returns false and sets $! (errno):

One of the examples at the perldoc page for unlink shows using $! with warn() in a foreach loop. Why shouldn't $! be used in this case?

In reply to Re^3: Unlinking a file when the file doesnt exist by Gulliver
in thread Unlinking a file when the file doesnt exist by Anonymous Monk

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