tmux - terminal multiplexer
youtube- unknown tmux
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tmux - enter new tmux session
ctrl+b - command mode
shift+5 or (%) - vertical split
shift+' or (") - horizontal split
Choosing window:
ctrl+b -> arrow
Resizing windows
ctrl+b -> ctrl+arrow
new window
ctrl+b -> c
ctrl+b -> n - next windows
ctrl+b -> p - previous windows