ssh-add(1) on OpenBSD
The text d473811dba72, as OpenBSD 5.4, OpenBSD 5.3 shipped it.
adds private key identities to the authentication agent
Flags it lists
-
-D -
-L -
-X -
-c -
-d -
-e -
-k -
-l -
-s -
-t -
-x