tmux is a "terminal multiplexer". It allows a
number of terminals (or windows) to be accessed
and controlled from a single terminal. It is
intended to be a simple, modern, BSD-licensed
alternative to programs such as GNU screen.
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Major features implemented include basic multiplexing, window switching, attaching and detaching, window listing and renaming, key rebinding, terminal emulation sufficient to handle most curses applications, and a status line. Missing features include support for VT100 line drawing characters, status line customisation (aside from colour), copy and paste and scrollback, and mouse support.