zwrite(1) on Linux
The text 9a940f760b45, as Debian 7 (Wheezy) shipped it.
write to another user via Zephyr
Flags it lists
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-C -
-F -
-O -
-a -
-c -
-d -
-f -
-i -
-l -
-m -
-n -
-o -
-q -
-r -
-s -
-t -
-u -
-v