dssp(1) on Linux
The text 913296b577ee, as Debian 10 (Buster), Debian 9 (Stretch), Debian 8 (Jessie) shipped it.
Calculate secondary structure for proteins in a PDB file
Flags it lists
-
--help -
--input -
--output -
--verbose -
--version -
-h -
-i -
-o -
-v