IdentityAgent
Specifies the UNIX-domain socket used to communicate with the
authentication agent.
This option overrides the SSH_AUTH_SOCK environment variable and
can be used to select a specific agent. Setting the socket name
to none disables the use of an authentication agent. If the
string "SSH_AUTH_SOCK" is specified, the location of the socket
will be read from the SSH_AUTH_SOCK environment variable.
Otherwise if the specified value begins with a ‘$’ character,
then it will be treated as an environment variable containing the
location of the socket.
Arguments to IdentityAgent may use the tilde syntax to refer to a
user's home directory or the tokens described in the TOKENS
section.
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IdentityAgent
. 这是在版本 7.3 (2016-08-01) 中添加的。从ssh_config
手册: