setop(1) on Linux
The text d7cec47e0c39, as Debian 11 (Bullseye) 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