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This site replaces the former Compute Canada documentation site, and is now being managed by the Digital Research Alliance of Canada.

Ce site remplace l'ancien site de documentation de Calcul Canada et est maintenant géré par l'Alliance de recherche numérique du Canada.

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tmux is a terminal multiplexer that allows multiple virtual sessions in a single terminal session. You can also disconnect from an SSH server without interrupting its process(es).

Cheat sheet

For a complete reference, see this page.

Command Description
tmux Start a server
Ctrl+B D Disconnect from server
tmux a Reconnect to server
Ctrl+B C Create a new window
Ctrl+B N Go to next window
Ctrl+B [ Enable "copy" mode, allowing to scroll with the mouse and Page-Up Page-Down
Esc Disable "copy" mode

Launch tmux inside a job submitted through tmux

If you submit a job with tmux and try to start tmux within the same job, you will get the lost server error message. This happens because the $TMUX environment variable pointing to the tmux server is propagated to the job. The value of the variable is not valid and you can reset it with:

[name@server ~]$ unset TMUX

However, nested use of tmux is not recommended. To send commands to a nested tmux, one has to hit Ctrl+B twice; for example, to create a new window, one has to use Ctrl+B Ctrl+B C. Consider using screen inside your job (if you are using tmux on a login node).