tmux is terminal multiplexer software, allowing users to work with terminals using multiple windows and panes, which can be created, removed, attached, and reattached as needed.

From the tmux website:

tmux is a terminal multiplexer: it enables a number of terminals (or windows), each running a separate program, to be created, accessed, and controlled from a single screen. tmux may be detached from a screen and continue running in the background, then later reattached.

tmux is largely designed to be a differently designed and BSD-licensed alternative to GNU screen. IRC support can be found in #tmux on the freenode network.


  • Runs on OpenBSD, FreeBSD, NetBSD, Linux and OS X
  • Panes - similar to the ones found in Vim
  • Client-Server model, allowing windows to be moved across sessions and allowing multiple clients to share the same session
  • 256-color support
  • UTF-8 support



tmux session

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