tmux - a terminal multiplexer

tmux is intended to be a modern, BSD-licensed alternative to programs such as GNU screen. Major features include:

• A powerful, consistent, well-documented and easily scriptable command interface.
• A window may be split horizontally and vertically into panes.
• Panes can be freely moved and resized, or arranged into preset layouts.
• Support for UTF-8 and 256-colour terminals.
• Copy and paste with multiple buffers.
• Interactive menus to select windows, sessions or clients.
• Change the current window by searching for text in the target.
• Terminal locking, manually or after a timeout.
• A clean, easily extended, BSD-licensed codebase, under active development.