vis(1) on FreeBSD
The text be6fa375e91f, as FreeBSD 10.4-RELEASE, FreeBSD 10.3-RELEASE, FreeBSD 10.2-RELEASE, FreeBSD 10.1-RELEASE, FreeBSD 10.0-RELEASE, FreeBSD 9.3-RELEASE, FreeBSD 9.2-RELEASE shipped it.
display non-printable characters in a visual format
Flags it lists
-
-F -
-b -
-c -
-e -
-f -
-h -
-l -
-m -
-n -
-o -
-s -
-t -
-w