Tmux is an alternative for screen. For anyone who doesn’t know screen, it is a terminal multiplexer which means, it allow multiple windows in terminal. It can split your window into multiple panes (vertical/horizontal), detach a session which can be attached at a later time. Detach/Attach is very useful for running a job in a remote server without having to keep the ssh open the whole time.
Tmux can be configured by ~/.tmux.conf file. My prefix key is Ctrl-q. Synchronizing panes: If you want to send your keystrokes to all the panes in your tmux window: :setw synchronize-panes In my case I do: Ctrl-q:setw synchronize-panes
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This is immensely useful if you want to execute the same set of commands on multiple servers.