sh(1) on macOS
The text a4336674dd08, as OS X 10.9.5, OS X 10.9.4, OS X 10.9.3, OS X 10.9.2, OS X 10.9.1, OS X 10.9, Mac OS X 10.8.5, Mac OS X 10.8.4, Mac OS X 10.8.3, Mac OS X 10.8.2, Mac OS X 10.8.1, Mac OS X 10.8 shipped it.
KornShell, a standard/restricted command and programming language
Flags it lists
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-u -
-v -
-w -
-x -
-z