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Are there alternatives to the SSH_AUTH_SOCK environment variable for passing agent info to ssh?

What I'm looking for is something like -o SshAuthSockPath="/path/to/socket" but nothing like that seems to exist. Am I missing something? Is this somehow a terrible idea?

I'd like to be able to use a different agent for the initial ssh command and ProxyJump connection without needing a wrapper script.

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You're looking for IdentityAgent. This was added in release 7.3 (2016-08-01). From the ssh_config manual:

 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.
  • Looks like this is an option added in 7.3. It doesn't look like there's anything comparable in earlier versions – Paul Rubel Jan 17 at 19:54
  • @PaulRubel Yes, 7.3 (2016-08-01). – Kusalananda Jan 17 at 20:21
  • It also looks like the ability to use a dollar-sign environment variable was only added in 7.9. – Binary Phile Jan 24 at 21:03
  • @BinaryPhile What are you referring to? – Kusalananda Jan 24 at 21:04

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