arguments passed to printf are more generic
On systems that /bin/sh is served by shells other than bash, or shells that don't implement the same syntax as the bash printf builtin, printf -- fails to produce the output necessary for standalone operation. The test case for this was SmartOS, which uses ksh93 as its /bin/sh. This change uses the more generic method of passing a format parameter of a single string, and then the argument to replace it with.
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