shtool-mkshadow(1) on Linux
The text 6af184c49302, as Debian 8 (Jessie), Debian 7 (Wheezy), Debian 6.0 (Squeeze) shipped it.
GNU shtool create shadow tree using symlinks
Flags it lists
-
--all -
--trace -
--verbose -
-a -
-t -
-v