suspicious-source(1) on Linux
The text 6d271d892619, as Debian 9 (Stretch), Debian 8 (Jessie), Debian 7 (Wheezy) shipped it.
search for files that are not the GPL's "preferred form of modification"
Flags it lists
-
--directory -
--extension -
--help -
--mimetype -
--verbose -
-d -
-e -
-h -
-m -
-v