How to create new tmux session if none exists

user_9859 0
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I am trying to figure out how to attach to a tmux session if a named tmux session exists, if not I want to create a new one with the given name.

Currently, I know of a few tmux commands which can partly achieve what I am looking for, but its not clear how to combine them together to get what I am looking for:

  • tmux attach attaches to an automatically existing session - but errors out if no session exists
  • tmux new creates a new session - but it does so every time, so I can't leave it in my .tmux.conf
  • tmux has-session tests whether a session exists - but I don't know how to stitch it together with the other commands

Thus, I would like to create a tmux script, so that this happens automatically, instead of having to manually create it everytime I need to log into a sessions.

How can I write a automatic script so as to create a new tmux session (if a given session name doesnt exist) or attach to a session name (if it exists)?

tmux
7 Answers

Alternately, you can add

new-session

to your .tmux.conf - that will create a default session on server start.

Then tmux attach will either attach to the current session (running server, that is), or create a new session (start the server, read the config file, issue the new-session command) and attach to that.

user_66780

For those who want to do the same thing in fish:

tmux attach -t mysesh; or tmux new -s mysesh
user_39802810
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