Sigh, crufty old shells. The Solaris test(1) manual says that

Sigh, crufty old shells.  The Solaris test(1) manual says that

	1) "-e" isn't supported by good old /bin/sh, so we use "-r"
	   instead;

	2) "The algorithm for determining the precedence of the
	   operators and the return value that will be generated is
	   based on the number of arguments presented to test", so we
	   explicitly parenthesize.

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