ssh-add(1) on Linux
The text 9c9fc2000978, as Debian 13 (Trixie) shipped it.
adds private key identities to the OpenSSH authentication agent
Flags it lists
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-C -
-D -
-E -
-H -
-K -
-L -
-S -
-X -
-c -
-d -
-e -
-h -
-k -
-l -
-q -
-s -
-t -
-v -
-x