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   Switch from getopt to getopts - and as part of that, update the usage,
   and the man page, to reflect modern usage rather than some ancient style
   that getopt[s] does not support (options, and their args when they exist)
   always come before non-option agrs.

   While here, update uses of test(1) to avoid obsolescent forms (and
   even when still defined, prefer sh structures over test when possible).

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