ssh-add(1) on Linux
The text a6d630aea298, as Debian 10 (Buster) 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 -
-q -
-s -
-t -
-x