ssh-add(1) on FreeBSD
The text 092d849d1177, as FreeBSD 11.4-RELEASE, FreeBSD 11.3-RELEASE, FreeBSD 11.2-RELEASE, FreeBSD 11.1-RELEASE, FreeBSD 11.0-RELEASE, FreeBSD 10.4-RELEASE, FreeBSD 10.3-RELEASE shipped it.
adds private key identities to the authentication agent
Flags it lists
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-D -
-E -
-L -
-X -
-c -
-d -
-e -
-k -
-l -
-s -
-t -
-x