surfaceSubset(1) on Linux
The text 4936d7f754f4, as Debian 10 (Buster) shipped it.
part of OpenFOAM (The Open Source CFD Toolbox).
Flags it lists
-
-case -
-doc -
-doc-source -
-fileHandler -
-help -
-help-full -
-help-man -
-noFunctionObjects