3mux is a terminal multiplexer with out-of-the-box support for search, mouse-controlled scrollback, and i3-like keybindings. Imagine tmux with a smaller learning curve and more sane defaults.



  • batteries included
  • i3-like keybindings
  • search
  • scrollback
  • mouse support
    • drag to resize panes
    • click to select pane
    • scrollwheel

Key Bindings

Key(s) Description
Create a new pane
Alt+Shift+F Make the selected pane fullscreen. Useful for copying text
Select an adjacent pane
Move the selected pane
Alt+R Enter resize mode. Resize selected pane with arrow keys or h/j/k/l. Exit using any other key(s)
Alt+/ Enter search mode. Type query, navigate between results with arrow keys or n/N
Scroll Move through scrollback
Shift Many terminal emulators support selecting text while pressing this key

Supported tmux Bindings

Key(s) Description
Ctrl+b " Split horizontally
Ctrl+b % Split vertically
Ctrl+b { Move pane left
Ctrl+b } Move pane right

Supported screen Bindings

Key(s) Description
Ctrl+a | Split horizontally
Ctrl+a S Split vertically
Ctrl+a Tab Cycle forward through panes

Installation Instructions

  1. Install Golang
  2. go get github.com/aaronjanse/3mux
  3. Run 3mux to launch the terminal multiplexer

To update 3mux, run go get -u github.com/aaronjanse/3mux


Warning: Arrow-key-controlled pane management is currently unsupported on Terminal.app. Please use the default vim-like keybindings instead.
Preferences > Profiles > Keyboard > Use Option as Meta Key


Preferences > Profiles > Keys > Option Key > Esc+


3mux searches XDG_CONFIG_HOME to find its config. If it cannot, it writes a config to ~/.config/3mux/config.toml upon the first run. Modifiers in shortcuts (e.g. Alt) are case-insensitive.

You can detect if you're running a script inside 3mux by checking if THREEMUX is equal to 1.


All help is welcome! You can help the project by filing issues recording what works well, what doesn't work well, and/or a feature you want. Pull Requests would be very much appreciated.

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