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TMux is a Screen like multiplexer for a terminal window
(generally a large window so you can split it up)

https://github.com/tmux/tmux/wiki/Getting-Started

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To use tmux (terminal multiplexer) by default, add the following to your
.bash_profile on the remote machine.

This will automatically start tmux when you log in and if you have a session
already (that was cut off e.g. by your vpn dropping out) it will re-attach to
your sessions where you left off (this is one of the many benefits of using
tmux)

  if [ -t 0 ] && [ -z ${TMUX} ]; then
    /usr/bin/tmux attach || /usr/bin/tmux
  fi

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Some useful Tmux commands (there are many but these are the main ones I use):

  ctrl-b %   - adds a new session with a vertical split
  ctrl-b "   - adds a new session with a horisontal split
  ctrl-b e   - join all sessions - so you type the same in all of them at once
  ctrl-b E   - un-join sessions
  ctrl-b z   - zoom/unzoom into/out of active session as mentioned,
               if you have a joined session, when zooming in it will only type
               in the zoomed session which is very useful,
  ctrl-b ?   - list all possible commands - there are many!

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