ksh93(1) on Linux
The text acb47a7d8dee, as Debian 7 (Wheezy) shipped it.
KornShell, a command and programming language
Flags it lists
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-- -
-A -
-B -
-C -
-D -
-E -
-F -
-G -
-H -
-L -
-M -
-N -
-O -
-P -
-R -
-S -
-T -
-X -
-Z -
-a -
-b -
-c -
-d -
-e -
-f -
-g -
-h -
-i -
-k -
-l -
-m -
-n -
-o -
-p -
-r -
-s -
-t -
-u -
-v -
-w -
-x -
-z