ssh-add(1) on FreeBSD
The text 6742e547fada, as FreeBSD 10.0-RELEASE, FreeBSD 9.2-RELEASE shipped it.
adds private key identities to the authentication agent
Flags it lists
-
-D -
-L -
-X -
-c -
-d -
-e -
-k -
-l -
-s -
-t -
-x