tftpd(8) on OpenBSD
The text 27dd8ec21db8, as OpenBSD 5.1, OpenBSD 5.0, OpenBSD 4.9, OpenBSD 4.8, OpenBSD 4.7, OpenBSD 4.6, OpenBSD 4.5 shipped it.
DARPA Trivial File Transfer Protocol server
Flags it lists
-
-c -
-l -
-s