How to update environment automatically when close the ssh connection forcelly and reconnect via ssh and reattach the tmux session?

[Isaac Ge]

I know there is a feature called "update-environmen", it will update "SSH_AUTH_SOCK" automatically if I deattach the tmux session, then close the ssh connection, then reconnect to the remote machine via ssh, then attach the tmux session finally.

However, I am used to close the whole virtual termite window immediately so that I close the ssh connection forcely too. Then reconnect to the remote machine via ssh, then attach the tmux session, but the latter does not update "SSH_AUTH_SOCK" automatically, even I put "set-option -g update-environment" to the `.tmux.conf` and reload the config manually. The relative StackOverflow have disscussed this question too: https://stackoverflow.com/questions/21378569/how-to-auto-update-ssh-agent-environment-variables-when-attaching-to-existing-tm#comment74036952_23187030

I have tried to put the following to the `.zshrc`:

```

if [-S "$SSH_AUTH_SOCK"] && [ ! -h "$SSH_AUTH_SOCK" ]; then 

    ln -sf "$SSH_AUTH_SOCK" ~/.ssh/ssh_auth_sock 

fi 

export SSH_AUTH_SOCK=~/.ssh/ssh_auth_sock 

```

However, it will update SSH_AUTH_SOCK automalically in the new created zsh window in the tmux session, it does not affect the existed zsh window in the tmux session.

[Nicholas Marriott]

There is no sensible way for tmux to modify the environment in processes
that are already running.

You can run something like:

eval `tmux showenv -s SSH_AUTH_SOCK`

In your existing shells after reattaching (assuming you have
SSH_AUTH_SOCK in update-environment - it is there by default).

On Mon, Jun 25, 2018 at 04:20:21PM +0800, Isaac Ge wrote:
> I know there is a feature called "update-environmen", it will update
> "SSH_AUTH_SOCK" automatically if I deattach the tmux session, then close
> the ssh connection, then reconnect to the remote machine via ssh, then
> attach the tmux session finally.
> However, I am used to close the whole virtual termite window immediately
> so that I close the ssh connection forcely too. Then reconnect to the
> remote machine via ssh, then attach the tmux session, but the latter does

> not updateA "SSH_AUTH_SOCK" automatically, even I put "set-option -g

> update-environment" to the `.tmux.conf` and reload the config manually.
> The relative StackOverflow have disscussed this question

> too:A https://stackoverflow.com/questions/21378569/how-to-auto-update-ssh-agent-environment-variables-when-attaching-to-existing-tm#comment74036952_23187030

> I have tried to put the following to the `.zshrc`:
> ```

> if [-S "$SSH_AUTH_SOCK"] && [ ! -h "$SSH_AUTH_SOCK" ]; thenA
> A A ln -sf "$SSH_AUTH_SOCK" ~/.ssh/ssh_auth_sockA
> fiA
> export SSH_AUTH_SOCK=~/.ssh/ssh_auth_sockA
> ```

>
> However, it will update SSH_AUTH_SOCK automalically in the new created zsh
> window in the tmux session, it does not affect the existed zsh window in
> the tmux session.
>

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