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).
For a complete reference, see this page.
|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).