cobfusc(1) on Linux
The text a9ff4211c0ab, as Debian 2.2 (Potato), Debian 2.1 (Slink), Debian 2.0 (Hamm) shipped it.
make a C source file unreadable but compilable
Flags it lists
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-V -
-a -
-b -
-d -
-e -
-g -
-h -
-m -
-n -
-o -
-p -
-r -
-s -
-t -
-u -
-w