How to Automatically Start or Reattach to a tmux Session with SSH

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When working on remote servers, maintaining persistent workflows can save a lot of time and effort. By combining SSH with tmux, you can ensure that a session starts automatically upon connection—or reattaches to an existing one. This code snipped demonstrates how to configure your .ssh/config file to achieve this.

# .ssh/config
Host hack
    Hostname hack.sizeofvoid.org
    User KawwptnBlaubaer
    IdentityFile  ~/.ssh/id_ed25519_sk
    RequestTTY yes
    RemoteCommand tmux new -A -s hackon

Key points: 

- RequestTTY:
Ensures a pseudo-terminal is allocated. This is required for interactive
applications like tmux.

- RemoteCommand:
This is the magic command that handles tmux sessions:
 - `tmux new`: Starts a new session.
 - `-A`: Attach to an existing session if one with the same name already exists.
 - `-s hackon`: Specifies the session name as hackon. You can replace this with
                a name of your choice.