Tmux

tmux
tmux session, with two horizontal and one vertical pane.
Developer	Nicholas Marriott
Release	20 November 2007 (2007-11-20)1
Stable release	3.7b2 / 2 July 2026 (2 July 2026)
Written in	C
Operating system	Unix-like
Available in	English
Type	Terminal multiplexer
License	ISC license
Website	tmux.github.io
Repository	cvsweb.openbsd.org/src/usr.bin/tmux

tmux is an open-source terminal multiplexer for Unix-like operating systems. It allows multiple terminal sessions to be accessed simultaneously in a single window. It is useful for running more than one command-line program at the same time. It can also be used to detach processes from their controlling terminals, allowing remote sessions to remain active without being visible.³

tmux includes most features of GNU Screen. It allows users to start a terminal session with clients that are not bound to a specific physical or virtual console; multiple terminal sessions can be created within a single terminal session and then freely rebound from one virtual console to another, and each session can have several connected clients.

Some notable tmux features are:⁴

• Menus for interactive selection of running sessions, windows or clients
• Window can be linked to an arbitrary number of sessions⁵
• vi-like or Emacs command mode (with auto completion) for managing tmux⁶
• Vertical and horizontal window split support

tmux lacks built-in serial port and telnet support.⁴ It uses different command keys from the ones used by screen, so it is not a drop-in replacement for screen, but it can be configured to use compatible keybindings.

tmux is included in the OpenBSD base system,⁷ and is available as a package for many other Unix-like operating systems.⁶