rs(1) on OpenBSD
The text 90f01591fb3b, as OpenBSD 3.3, OpenBSD 3.2, OpenBSD 3.1 shipped it.
reshape a data array
Flags it lists
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-C -
-E -
-G -
-H -
-K -
-S -
-T -
-c -
-e -
-g -
-h -
-j -
-k -
-m -
-n -
-s -
-t -
-w -
-y -
-z