shred(1) on Linux
The text 397aa1120cf9, as Debian 8 (Jessie) shipped it.
overwrite a file to hide its contents, and optionally delete it
Flags it lists
-
--exact -
--force -
--help -
--iterations -
--random-source -
--remove -
--size -
--verbose -
--version -
--zero -
-f -
-n -
-s -
-u -
-v -
-x -
-z