Create a new session (for the first time on your server) :

tmux

Attach to an existing session :

tmux a

Inside a session, you can

• Detach : Ctrl+b d
• Scroll : Ctrl+b PgUp/PgDown (quit with q) also can use mouse after first page up or down (see tips below to activate normal mouse scrolling)
• Copy mode : Ctrl+b [ (quit with q)
• Split horizontally : Ctrl+b “
• Split vertically : Ctrl+b %
• Switch pane : Ctrl+b arrow key
• Resize pane : Hold Ctrl+b + arrow keys
• Toggle zoom in pane : Ctrl+b + z

Tips

• Copy/pasting :
  • Install xclip so buffer copied inside tmux are also available to X : sudo apt-get install xclip
  • Select by using Shift + mouse selection
  • Copy with Ctrl + Shift + C
• Use the mouse for scrolling : put set -g mouse on in ~/.tmux.conf, or if you are inside a tmux session, activate the command sequence CTRL+B+: and then type set -g mouse on
  This will cause some trouble using copy/paste because selection is automatically used by tmux buffer : to avoid that, SHIFT + selection will use your local buffer.