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ssh-agentis agnostic to the type of session it is part of (e.g. tty session, X11 session, or something else). The one thing I would like to say if that your automated scripts probably shouldn't be depending on the key loaded in your agent. They should probably each have their own private key, which is authorized via forced commands on the appropriate servers to run only the specific remote commands that each script needs to run. That would of course let you run those from cron etc...ssh-agentto know when a session is inactive, but at least start the timeout from whenever the last signing operation occurred, not just wheneverssh-agentwas launched. Also, I already use separate user accounts and keyfiles for each script role, sudoers allows only 1 or 2 commands to be sudo'd if necessary, and I've looked atlshellto lock things down further. But all that still doesn't absolve me from needing to protect my keyfiles: just becausesudo zfs sendis the only command allowed for a given key, that's a pretty powerful command for whoever wields that key!ControlMaster/ControlPath/ControlPersistoptions (seeman ssh_config) for your script. At least if its only connecting to one host.ssh-agentkeep my keys loaded until I reboot (which could be weeks).