PTmasker(1) on Linux
The text 47aadfeb15ad, as Debian 11 (Bullseye), Debian 7 (Wheezy) shipped it.
Compute stitching masks
Flags it lists
-
-e -
-f -
-h -
-m -
-p -
-q -
-s -
-w -
-x -
-z