md5(1) on FreeBSD
The text a21308995560, as FreeBSD 13.5-RELEASE, FreeBSD 13.4-RELEASE, FreeBSD 13.3-RELEASE shipped it.
calculate a message-digest fingerprint (checksum) for a file
Flags it lists
-
-b -
-c -
-p -
-q -
-r -
-s -
-t -
-x