psclip(1) on Linux
The text 4f9eefea3926, as Debian 2.2 (Potato) shipped it.
To set up polygonal clip paths
Flags it lists
-
-: -
-B -
-C -
-E -
-H -
-J -
-K -
-M -
-N -
-O -
-P -
-R -
-U -
-V -
-X -
-Y -
-Z -
-bi -
-c