setop(1) on Linux
The text f1c887184e77, as Debian 9 (Stretch) shipped it.
make set of strings from input
Flags it lists
-
-# -
--count -
--help -
--ignore-case -
--include-empty -
--intersection -
--is-empty -
--quiet -
--symmetric-difference -
--union -
--verbose -
--version -
-C -
-i -
-s -
-u