I spent a lot of time in shells. Tmux is a late-discovery must-have for me. It is terminal multiplexer. I used to use screen command. But tmux is next generation of it. Tmux has 3 basic constructs: session,window and pane. Think session as a global container of insider elements: windows and panes. As described here Ctrl-b is the prefix command. After prefix s shows sessions and enables navigation d detaches from that session (not quit) w lists windows c create new window % splits a window horizontally " splits a window vertically n passes to next window p passes to previous window x kills the current pane & kills the current window ! breaks the pane out of window (making it a seperate window) arrow keys enables navigation through panes, windows $ tmux a attaches a previous session. Have fun.
Errare humanum est sed perseverare diabolicum.